fukui safety valve free sample

2023-05-21 21:22:12

SL / SJ Series is a safety valve for steam service of boiler which is getting higher temperature and pressure year after year for advancing power generation efficiency. This series have been approved by the National Board of Boiler and Pressure Vessel Inspectors as meets all of demanding requirements from ASME Boiler and Pressure Vessel Code Section I Power Boiler. In addition, it meets with domestic and foreign regulations such as technical standard for thermal power generation and CE mark.

fukui safety valve free sample

Safety precautionsThe following suggestions show the degree of danger and damage caused when the product is used improperly with the suggestionsdisregarded.Indicates an imminently hazardous situation where disregarding the suggestions will result in death or serious injury.

Indicates a situation where disregarding the suggestions could result in injury or property damage.When lifting the safety valve, do not get under it.In order to prevent an accident due to falling etc., lift the safety valve as vertically as possible. Never get under the valve being lifted. Check theweight of the safety valve and use a proper hoisting accessory for lifting the valve.Do not use the lever of cap or the safety valve for lifting it.Avoid using the lever, cap, etc. for lifting the safety valve. Doing so will affect the valve performance. It is recommended to wind a wire or nylon slingaround the neck and bonnet or yoke at the outlet of the valve and lift the valve.Take care not to allow the safety valve to fall down.Many safety valves are of angle type and therefore is very unstable. When storing them, avoid piling them improperly. Doing so may cause them tofall down and get damaged.Store the safety valve indoors.When storing the safety valve before installation work, store it indoors. If it should be impossible to store the valve indoors, cover the whole valvewith a waterproof sheet etc. to prevent it from being weathered.Install the safety valve vertically on the mounting nozzle stub.Install the safety valve vertically on the main body or mounting nozzle stub. If the safety valve is inclined, improper air sealing and unstable operationwill be caused. The tolerance of safety valve inclination should be within 1 degree from the vertical direction.Take care when tightening the flange bolts.When installing the safety valve, remove the dust cover at the inlet and outlet and check that no foreign matter remains. When installing theflange-type safety valve, take care not to allow the flange gasket from protruding and tighten the flange bolts alternately and evenly to preventuneven tightening. Improper tightening will cause leakage. If the fluid is hot, there is a risk of burns due to leakage.The safety valve inlet nozzle stub should be above the valve inlet diameter.Inside the safety valve mounting nozzle stub, round the edge so that the fluid will flow smoothly from the boiler to the safety valve and make its innerdiameter equivalent to or larger than the nominal diameter of the safety valve. The recommended R dimension of the inlet pipe inner diameter is 1/4or more of the bore size.The pressure loss at the safety valve inlet should be within 2%.The pressure loss from the mounting portion to the safety valve should be 2% or less of the pressure setting of the safety valve. If this pressure lossis high, the safety valve may chatter during operation. When installing the safety valve on the elbow, the pipe diameter should be larger than thesafety valve inlet diameter by one size. Use an elbow with a larger curvature (long elbow) and provide a support in consideration of the reactive forcegenerated during the operation of the safety valve.Install the safety valve well away from the valves and joints.When installing the safety valve on the plumbing line, install it well away from the valves and joints that may disturb the fluid flow. It is necessary toinstall the safety valve at least about 10D (D: Pipe diameter) away from them both upstream and downstream. Do not provide a branch pipe at thesymmetrical position to the safety valve installation. When installing two or more safety valves on the same header/line, give due consideration tothe installation spacing. When all the safety valves operate at the same time, partially biased pressure distribution will cause a malfunction.Pay attention to the reaction generated when the safety valve performs relieving.The diameter of the discharge pipe should be equal to or larger than the outlet diameter of the safety valve. The distance from the valve stem of thesafety valve to the center of the discharge pipe should be less than four times the outlet diameter. The length of the discharge pipe should be asshort as possible. Avoid bending the discharge pipe and lay it to the outside. The structure of the discharge pipe should be as simple and reliable aspossible. The back pressure produced when the safety valve operates should not exceed 10% of the set pressure. If the back pressure exceeds 10%of the set pressure, unstable operation will be caused. The structure should be such that the safety valve will not be adversely affected due tothermal expansion etc. of the boiler, equipment and discharge pipe. When a drain pipe is connected to the discharge pipe, be sure to open its end.Do not constrain the safety valve with the drain piping.In order to drain the drainage generated while the safety valve is performing relieving and rain water, be sure to install drain piping. Provide the drainpiping independently and separately from the other piping and take care not to allow the drain piping to constrain the safety valve. Open the lowerend of the drain piping and do not install a cock or valve on it.Pay attention to the test pressure when a pressure proof test is conducted.Check the test pressure when a pressure proof test is conducted and never exceed this value. In the case of some safety valves, the water pressureplug is inserted into the nozzle for a pressure proof test. In this case, be sure to remove the water pressure plug before starting operation after theend of the pressure proof test. For further details, refer to the instruction manual.Do not move the lever of the safety valve indiscriminately.Other than when necessary, do not touch or raise the lever of the safety valve indiscriminately. Doing so will cause a malfunction.Do not use the safety valve as a foothold.Do not perform work while using the installed safety valve as a foothold. Doing so may damage the safety valve. If the safety valve should operate,a dangerous situation will occur.Pay attention to the installation environment of the safety valve.If the installation environment of the safety valve is near a heat source or exposed to cold air, a malfunction and improper air sealing may be causeddue to uneven expansion and contraction as a result of external thermal effect. In such a case, change the installation location or take measures forheat-retention. When attaching heat reserving material, spread it to the lower end of the safety valve body drum section and do not cover the lockbolt for adjustment.Pay attention to the pressure when removing and disassembling the safety valve.When removing the safety valve for periodic maintenance etc. or disassemble the safety valve installed on the equipment, do so after confirming thatthere is no internal pressure in the equipment. Not doing so may lead to a serious accident.Secure a working space around the safety valve.In order to disassemble, inspect and adjust the safety valve, secure a working space around it. A space above the safety valve is also necessary fordisassembling. Make consideration so that a chain block etc. for lifting can be hung.

Thank you very much for habitually using FUKUI product.We manufacture our products in the standardized manufacturing process and under strict quality control. If the product should fail due toa defect in manufacturing, we will repair the product free of charge or replace it with a substitute according to the warranty provisionshown below.

2. Scope of warrantyIf the product should fail during the warranty period and we are to blame for the cause, we will repair the product or deliver asubstitute at our expense. However the following cases will not be qualified as being warrantable.2-1. Leakage from the valve or unstable operation is caused due to dirt etc. in the boiler or piping.2-2. A failure is caused because the product is handled or used improperly.2-3. A failure is caused due to other than us.2-4. A failure is caused because the product is repaired or modified improperly.2-5. A failure is caused because the product is handled, stored or used in harsh environments beyond the design specifications.2-6. Parts etc. that are to be worn significantly, which is announced in advance2-7. A failure is caused due to force majeure such as fires, floods, earthquakes and lightning.2-8. Procurement and cost of specialists and special equipment (crane, scaffold, etc.) necessary for adjusting, installing and removingwhen the installation location is a high place, dangerous place and heavy object at the time of repair and adjustment3. In the case of overseas plantIf the product should fail during the warranty period and we are to blame for the cause, we will deliver a substitute at our expense.The scope of warranty is as described in the preceding paragraph.

This safety valve is intended to be installed on the cargo tank etc. of a LNG carrier, LPG carrier,FPSO and FSO. As a marine safety valve, it uses the structure of a safety valve with pilot valvebecause the set pressure does not fluctuate due to vibration. Two types of valves are available:the slight-pressure-type diaphragm valve (PSL-MD Series) mainly used for a LNG carrier and thelow-pressure-type piston valve (PSL-MP) used for a pressurized LPG carrier etc.

Based on FUKUI experience and know-how in the field ofliquefied gas such as transportation and storage of naturalgas, PSL series copes with harsh environments of ultralowtemperatures and slight pressures.

In the case of the conventional safety valves, it was notpossible to change the popping pressure easily.In the case of PSL series, the popping pressure can bechanged easily and securely according to the cargo bystacking the multiple set (pressurizing unit).

High airtightnessThe main valve uses a membrane seat structure thatprevents cargo from leaking. Teflon is used as thesealing material to prevent the seal performance frombeing degraded due to deterioration with age, therebycompletely protecting important cargo.

Pilot valve codeDesignationDescription1Single pilot, Single set2Single pilot, Multiple set3Dual pilot, Single set4Dual pilot, Multiple set6Vacuum only

Valve body material codeMaterialDesignationJISASTM(Blank)SCPH2A216 Gr.WCBC5SCPL1A352 Gr.LCBSSCS13A351 Gr.CF8S1SCS14A351 Gr.CF8MS2SCS19A351 Gr.CF3S3SCS16A351 Gr.CF3M

Main valve structure codeDesignationDescriptionFlangeless type2Without diaphragm supportFlangeless type3With diaphragm supportFlange type4With diaphragm support

Model codePSL-MD ()2-()()()-SPSL-MD ()2-()()()-C5PSL-MD ()2-()()()-S1Temperature range-196.0 125-45 125-196.0 125Body 1SCS13SCPL1SCS14NozzleSUS304 or SCS13SUS316 or SCS14DiscSUS304SUS316SeatTeflonTeflonDisc retainerSUS304SUS316Disc center nutSUS304SUS316Retainer bolt & nutSUS304SUS316SpindleSUS304SUS316GuideSUS304SUS316Upper diaphragm set plateSUS304SUS316DiaphragmTeflonTeflonCover 1SCS13SCS13SCS14Bolt & nutSUS304SUS316GasketTeflonTeflonGasketTeflonTeflonGasketTeflonTeflonNozzle seat installation boltSUS304SUS316Inlet bolt & nutSUS304SUS316Pilot valveSUS304 or SCS13SUS316 or SCS141 Various Classification Society materials are supported. The temperature range varies depending on the main body material.

Standard materialModel codePSL-MD()3-()()()-NSPSL-MD()3-()()()-NC5PSL-MD()3-()()()-NS1Temperature range-196 125 C-45 125 C-196 125 C1Body 1SCS13SCPL1SCS142NozzleSUS304 or SCS13SUS316 or SCS143DiscSUS304SUS3164SeatTeflonTeflon5Disc retainerSUS304SUS3166Disc center nutSUS304SUS3167Retainer bolt & nutSUS304SUS3168SpindleSUS304SUS3169GuideSUS304SUS31610Diaphragm coverSUS304SUS31611DiaphragmTeflonTeflon12Diaphragm retainerSUS304SUS31613Cover 1SCS13SCPL1SCS1414Bolt & nutSUS304SUS31615GasketTeflonTeflon16GasketTeflonTeflon17Inlet bolt & nutSUS304SUS31618Remote pickup flange & pipeSUS304SUS31619Pilot valveSUS304 or SCS13SUS316or SCS141 Various Classification Society materials are supported. The temperature range varies depending on the main body material.2 The inlet and outlet flange based on the JIS standard is also manufactured. In this case, there may be cases where a semi-nozzle is used.

11DiaphragmTeflonTeflon12Diaphragm retainerSUS304SUS31613Cover 1SCS13SCP1SUS316 or SCS1414Bolt & nutSUS304SUS31615GasketTeflonTeflon16GasketTeflonTeflon17Inert bolt & nutSUS304SUS31618Remote pickup flange & pipeSUS304SUS31619Pilot valveSUS304 or SCS13SUS316 or SCS141 Various Classification Society materials are supported. The temperature range varies depending on the main body material.2 The inlet and outlet flange based on the JIS standard is also manufactured. In this case, there may be cases where a semi-nozzle is used.

Model codePSL-MD()4-()()()-SPSL-MD()4-()()()-C5PSL-MD()4-()()()-S1Temperature range-196 125 C-45 125 C-196 125 CBody 1SCS13SCPL1SCS14NozzleSUS304 or SCS13SUS316 or SCS14DiscSUS304SUS316SeatTeflonTeflonDisc retainerSUS304SUS316Disc center boltSUS304SUS316Retainer bolt & nutSUS304SUS316SpindleSUS304SUS316GuideSCS13SCS14Diaphragm set plateSUS304SUS316DiaphragmTeflonTeflonDiaphragm retainerSUS304SUS316Cover 1SCS13SCP1SUS316 or SCS14Bolt & nutSUS304SUS316GasketTeflonTeflonGasketTeflonTeflonGasketTeflonTeflonPilot valveSUS304 or SCS13SUS316 or SCS141 Various Classification Society materials are supported. The temperature range varies depending on the main body material.

Model codePSL-MD()4-()()()-SPSL-MD()4-()()()-C5PSL-MD()4-()()()-S1Temperature range-196125 C-45125 C-196125 CBody 1SCS13SCPL1SCS14NozzleSUS304 or SCS13SUS316 or SCS14DiscSUS304SUS316SeatTeflonTeflonDisc retainerSUS304SUS316Disc center boltSUS304SUS316Retainer bolt & nutSUS304SUS316SpindleSUS304SUS316GuideSUS304SUS316Diaphragm coverSUS304SUS316DiaphragmTeflonTeflonDiaphragm retainerSUS304SUS316Cover 1SCS13SCP1SCS14Bolt & nutSUS304SUS316GasketTeflonTeflonGasketTeflonTeflonRemote pickup flange & pipeSUS304SUS316Pilot valveSUS304 or SCS13SUS316 or SCS141 Various Classification Society materials are supported. The temperature range varies depending on the main body material.

The pressure sensing section of the pilot valveis connected individually. This type preventsabnormal operation such as hunting when thepressure loss at the safety valve inlet pipingand nozzle stub exceeds 3%.The remote pick-up system is recommendedas a safety valve for tank.

The pressure sensing section of the pilot valveis connected to the main valve inlet. Like theordinary conventional safety valve, this valvecan be used by only installing it on the pipingand tank.The pressure loss at the safety valve inletpiping and nozzle stub should be 3% or less.

Two pilot valves are installed on one main valve. The pilot valvescontrol two set pressures, positive and negative pressures,respectively.(Code designation = 3)For both positive and negative pressures, two to three set pressurescan be controlled by fitting the aux. pressure unit to the pilot valve.(Code designation = 4)

In the case of the safety valve with pilot valve, because of itsstructure, air is sucked from the main valve outlet to the inside ofthe vessel on which the valve is installed when the vessel becomesin a vacuum state. To avoid this, the check valve is installed on thesupply line to prevent reverse flow.

By drawing the pressure in the mainvalve dome with the manual liftingdevice using the flow of the pressuresource such as a nitrogen cylinder, theoperating performance of the mainvalve can be checked even if there is nopressure on the primary side of thesafety valve with pilot valve.

By using the field test kit, the poppingpressure of the pilot valve can bechecked with the safety valve installedon the equipment.Because it is not necessary to removethe safety valve from the equipment orto use a large device, a simple andeffective test can be conducted.

Supporting safety transportation of various liquefied gases forming industrial basePSL-MP series is suitable for intermediate and low pressure air, gas,vapor, etc. Its design is optimum as a safety valve for a liquefied gasbulk carrier tank. The multiple pressure and large relieving capacity(flow coefficient: 0.843) of the IGC code can be supported withminimum installation cost.Main valve of simple structure and Pilot valve with excellentdurability support the safety of the system.

In the case of the conventional safety valves, it was notpossible to change the popping pressure easily.In the case of PSL-MP series, the popping pressure canbe changed easily and securely according to the cargo bystacking the multiple set (pressurizing unit).The design is suitable for the IGC code.IGC

High airtightnessThe main valve uses a self-seal structure that preventscargo from leaking. In addition, an O-ring seal excellent incorrosion resistivity is used to enhance the airtightness.Important cargo will be protected completely.

High safetyIt is possible to optionally install the protector thatprevents the piping and valve from being damaged by driftwood or flotage driven by high waves generated by a stormetc. during voyage.Measures are taken to prevent a malfunction under anycircumstances.

Pilot valve codeDesignationDescription1Single pilot, Single set2Single pilot, Multiple set3Dual pilot, Single set4Dual pilot, Multiple set6Vacuum only

Valve body material codeMaterialDesignationJISASTM(Blank)SCPH2A216 Gr.WCBC5SCPL1A352 Gr.LCBSSCS13A351 Gr.CF8S1SCS14A351 Gr.CF8MS2SCS19A351 Gr.CF3S3SCS16A351 Gr.CF3M

Model codeTemperature rangeNozzleSeat 2DiscSeat retainerRetainer boltBody Cover Bolt & nutGasketGasketPiston sealSense tubeSupply pipeGasketBolt & nutPilot valve

SJ/SL series is developed as a safety valve for steam service and conforms to various Classification Society standardssuch as the Steel Ship Standards (NK) and Lloyds Register of Shipping Standards (LR).The structure and material of SJ/SL series are designed so that the valve can withstand harsh high-temperature andhigh-pressure use environments.

Technology for enhancing product reliability (SJ/SL100-300)The safety valve should protect the pressure component from a risk of explosion by releasing the excessive pressure rapidly in theevent of an emergency under harsh use conditions. On the other hand, under normal operating conditions, no fluid should leak fromthe pressure component and high sealing performance is required.The role of the safety valve is to perform these conflicting tasks. The safety valve should confront this challenge only with the forceof the built-in spring.In order to perform these tasks, we adopt disc structures Feather lip disc and Thermo lip disc: the tip of the seat is machinedprecisely into a lip shape to make it flexible and proper operating characteristics and sealing performance are realized by making useof the temperature and pressure of fluid.In addition, our technologies based on long years of experience and achievements are incorporated into the parts such as the springand spindle, thus creating reliable products. YorkSJ/SL100-300 series adopts a yoke structure. By locating thespring in the yoke, efficient atmospheric cooling is performed.Therefore the vapor heat does not affect the spring duringoperation. SpringWe adopt a high-dimensional-accuracy cylindrically coil springwhose deflection exponent is made constant regardless of thepressure and whose load eccentricity is corrected.Alloy steel excellent in fatigue resistance, workability,hardenability, etc. is adopted as the spring material. Operation adjustment mechanismThe lower adjusting ring located at the top end ofthe nozzle is an adjustment mechanism for makingfine adjustments to the pop-up operation in theearly stage of relieving; the upper adjusting ringlocated at the lower portion of the guide is anadjustment mechanism for adjusting the blowdown.In addition, our back pressure adjustmentmechanism adjusts the blowdown by controlling theback pressure produced behind the disc at the timeof relieving of the safety valve with the backpressure adjustment needle or back pressureadjustment cock installed on the yoke. NozzleThe structure of the nozzle of the safety valve is such that theintegral full nozzle is screwed into the valve body and fixed andthe lower portion is seal-welded. Highly stable carbon forgedsteel or low alloy forged steel is used as the material of thenozzle. The tip seat portion that is a contact surface with thedisc is subjected to surface-hardening treatment by means ofstellite filling.

YorkSL400 series adopts a yoke structure. By locatingthe spring in the yoke, efficient atmosphericcooling is performed. Therefore the vapor heatdoes not affect the spring during operation. SpringWe adopt a high dimensional accuracy cylindricallycoil spring whose deflection exponent is madeconstant regardless of the pressure and whoseload eccentricity is corrected.Alloy steel excellent in fatigue resistance,workability, hardenability, etc. is adopted as thespring material. Operation adjustment mechanismThe lower adjusting ring located at the top end ofthe nozzle is an adjustment mechanism for makingfine adjustments to the pop-up operation in theearly stage of relieving; the upper adjusting ringlocated at the lower portion of the guide is anadjustment mechanism for adjusting the blowdown.In addition, our back pressure adjustmentmechanism adjusts the blowdown by controllingthe back pressure produced behind the disc at thetime of relieving of the safety valve with the backpressure adjustment needle or back pressureadjustment cock installed on the yoke. NozzleThe structure of the nozzle of the safety valve issuch that the integral full nozzle is screwed intothe valve body and fixed and the lower portion isseal-welded. Highly stable carbon forged steel orlow alloy forged steel is used as the material of thenozzle. The tip seat portion that is a contactsurface with the disc is subjected tosurface-hardening treatment by means of stellitefilling.

Technology for enhancing product reliability (SL500900)In addition to the relieving property and the air tightness of the seat surface, the safety valve needs amechanism for providing high reliability. One example is the back pressure adjustment mechanism of oursafety valve. Besides the clear pop and opening valve force adjustment mechanism, the unique back pressureadjustment mechanism is provided to adjust the blowdown of the safety valve.This mechanism is of yoke-type side needle system that features protection of the coil spring and easyadjustment work after installation. Also implemented is the cooling-type center throttle system in which thethrottle opens and closes automatically according to the operation of the disc. SpindleBecause the spring thrust force should be transmitted vertically and properly tothe center of the disc, the load resistant power and abrasion resistance propertyagainst the thrust force are required at the tip end of the spindle that transmitsa spring thrust force of hundreds of kilograms to several tons.We therefore form into completely the same spherical surface the dorsal part ofthe disc and the tip end of the spindle that receive the spindle thrust force so asto ensure the centricity of the spring thrust force. In addition, we adopt astructure that transmits the load securely with a proper contact area.In addition to 13-chrom system stainless steel, chrom nickel silicone stainlesssteel that is more excellent in abrasion resistance property for high-temperatureand high-pressure specifications is used as the material of the spindle. Cooling spool and bonnetIn the case of SL700 or higher, a cylindrical bonnet is used in order to protectthe spring and enhance the vibration resistance. In addition, cooling spool isprovided between the valve body and bonnet so as to prevent the spring frombeing exposed directly to high temperature vapor when the safety valveoperates. This cooling spool portion also facilitates the adjusted back pressureexhaust of the center throttle, etc. Valve bodyThe drum section of the valve body is rigid and spherical. This structure is lesssusceptible to the reaction force of the blown-out vapor or the distortionattributable to vibration of the mounting-side and discharge-side piping.Because there is no useless blind corner in the valve body and the pressuredistribution in the valve body is even, the flow toward the valve outlet is smooth.

DiscFor the disc structure, two systems Feather lip disc and Thermo lip discwhere the contact surface with the nozzle is a lip face are selected and useddepending on the temperature and pressure.The principle is as follows. The seat portion of the disc is formed into a lip shape.The lip end is deflected until the safety valve performs relieving. When the discseat surface pressure decreases due to a pressure rise, the lip portion rises toreduce the contact area between the disc and nozzle, which keeps the seatsurface pressure high to maintain the air sealing.Thermo lip disc is of build-up structure composed of a combination of a disccenter and disc ring and is used for higher-pressure applications because itsfunction is further enhanced as compared with the feather lip.The feature of this system is that the striker plates for preventing the lip portionfrom being deformed are provided on end face of the disc center and the backside of the lip. They prevent the lip portion from being deformed due to theimpact given when the safety valve opens. This maintains the excellent airsealing function even in high-temperature and high-pressure areas and servesto enhance the durability of the disc.In addition, because there is a clearance between the disc and holder (flexibletype), the disc will not be affected even if the valve stem is inclined due toexternal forces such as piping reactive forces.

The mounting size is the nominal size of the inlet and outlet flanges. The inlet diameter is the inside diameter of the safety valve inlet and may differ from the inletflange size.

NOTE In the case of SL ( ) 6 ( ), the maximum operating pressure may exceed the pressure-temperature rating of ASME. Do notuse the safety with the standard of ASME being exceeded. Refer to PRESSURE-TEMPERATURE RATING TABLE of ASMEB16.34.

Solenoid pressure relief valve PSH-ER seriesSolenoid pressure relief valve PSH-ER series is a relief valve that opens and closes being powered by electricity(electromagnet).PSH-ER is composed of a main valve, pilot valve, solenoid (electromagnet) assembly, controller and operation panel.As compared with the ordinary spring safety valve, it has the following features. Complete prevention of leakage until the set pressure Correct and secure relief setting with the pressure sensor Secure blowdown (2% blowdown realized)This contributes to improvement of boiler operating efficiency and cost savings.

Pressure relief valve for high-temperature and high-pressure liquid RECL-PE seriesThis RECL-PE is developed mainly for high-temperature and high-pressure liquid (feed water heater etc.). The structure andmaterial are designed so that the valve can withstand harsh high-temperature and high-pressure use environments.Its features are the optimum shape of the main section realizing smooth operating characteristics for liquid, the forged body that cancope with excessive piping reaction forces, and the surface-hardened sliding portion that can withstand continuous operation.For further details, contact our sales personnel.

Exhaust pipe for safety valve for steam (drip pan)90% or more of trouble reports about safety valves relateto seat leak (nozzle leak). Most of the causes of seatleak are the safety valve exhaust pipe being restricted.In order to prevent such trouble, we manufactureoptimum exhaust pipes (drip pans) for safety valves.Order our exhaust pipe together with our safety valve.

Do you waste cost and time in a safety valve operation test filledcan test that is indispensable at the time of inspection of the boilerJK-2 has the following features. Permits tests at normal operating pressure Permits tests at low fuel cost, lost cost and low noise The adopted direct reading provides high reliability. Because a microcomputer is used, the operation is simple,secure and speedy. The measurement result is indicated immediately.Hyd. pompHyd. line

By conducting a jack-up test, the operating pressure of a safetyvalve can be checked at the equipment operating pressure. It is aconvenient testing method that not only reduces the cost of testingbut also is effective in advancing ambient environment measures.For further details, contact our sales personnel.

BRONZE CASTING FULL-BORE SAFETY VALVEApplicationFeaturesFor use in the secondary-side piping of smallz A needle structure that facilitates blowdownboilers, package boilers, pressure vessels, steamadjustment is adopted.headers, air headers, compressors, blowers,z The type approval of various classificationreducing valves.society standards is obtained.z It is a high-performance full bore safety valvewhose body is compact.- 47 -

IntroductionFUKUI RE series safety valve has come out of FUKUI half-century-long accumulated technologies and experiences indesigning and manufacturing of safety valves.Over the years, various types of FUKUI safety valves have been meeting the diversified needs of customers. We believe that,by adding this simpler, higher-performance and lower-cost RE series, we can help you prevent process lines from beingpressurized. The applicable fluids are various gases such as air, steam, vapor and liquids. Because the disc and disc holder are of assembly structure and the disc is discoid, the thermal effect due to hightemperatures is minimized and excellent leakage preventing performance is delivered. By forming the disc holder outer periphery into an umbrella shape and making use of the fluid reaction, lifting up isperformed completely with an ultra pressure equal to or less than 110% of the popping pressure. In order to performclear popping with the initial valve opening force at the time of valve operation and to adjust the blowdown pressure,the adjustment ring is provided on the upper edge of the nozzle. This valve is composed of a necessary minimum number of parts and they are compatible with each other. Thereforethe number of parts to be stored as spare parts is small and very easy maintenance with significantly less cost isrealized. The inlet and outlet face-to-face dimension conforms to API Standard 526.

Outlineon the disc side and the other end is fixed on thevalve body and bonnet side and the fluid passingsection of the valve body is cut off from the bonnetsection, the fluid will not leak to the bonnet section.Because the guide section of the disc holder islocated in the bellows and is not exposed directly tothe blown fluid, the important sliding portion is notdamaged. In addition, the lift control prevents thebellows from being compressed excessively anddamaged.Be sure to degas the bonnet (vent hole). If notdegassed, the bonnet becomes a completely sealedchamber and cannot be balanced completely, whichaffects the operation and popping pressure. It ispossible to know that the bellows is damaged bydetecting gas leakage in degassing the bonnet.

Standard installation method(a) The mounting flange is based on RAISED FACEFLANGE of the following standards.Class 150-2500 ASME B16.5 StandardClass 10K-30K JIS(b) The bolt holes in the flange is center symmetry.We will manufacture ring joint, male-female andtongue-groove flange surfaces to order. TrimIn the case of FUKUI safety valve, the trim refers tothe nozzle and disc only. Balance bellows type safety valveFor sizes D to T, the balance bellows type can beselected except for nominal diameter of 3/4D1.Application: The primary applications of thebellows type safety valve are as follows.1-1 Place where the back pressure is accumulatedor produced on the safety valve discharge pipeside (secondary side) and the back pressurefluctuates to affect the popping pressure of thesafety valve1-2 Place where the back pressure fluid should notleak outside when the popping pressure of thesafety valve is adjusted1-3 Place where it is necessary to prevent the parts(spindle, spring, etc.) in the bonnet from beingcorroded due to the fluidFortheabove-mentionedspecificationconditions, the balance bellows type safety valveor the bellows seal type safety valve is selectedand used. The back pressure produced on thesafety valve discharge pipe side is classifiedbased on the property as follows.i Superimposed back pressureBack pressure accumulated on the safety valvedischarge pipe side (secondary side) before thesafety valve performs relieving

Back pressure produced on the safety valvedischarge pipe side (secondary side) due to thefluid flow after the safety valve performs relieving StructureThe structure of the bellows type safety valve is asshown in the figure to the right and its features areas follows. Because the effective area of thebellows is equal to the area of the nozzle opening ofthe safety valve to prevent the back pressure frombeing applied to the bellows-covered portion of thedisc and balance the upper surface and lowersurface of the disc completely, the poppingpressure of the safety valve will not be affectedeven if the back pressure is applied and fluctuates.In addition, because one end of the bellows is fixed

The test gag is useful when ahydraulic pressure test orpopping test is conducted. Besure to slightly tighten the gagwith fingers. After thecompletion of the test, be sureto replace the gag with theplug. Not doing so will preventthe safety valve fromoperating, which is dangerous.

This type is used when it isnecessary to check theoperation of the safety valveperiodically and the fluid isallowed to be blown into theatmosphere (steam, air, etc.).

Effective area of safety valve The effective area of the RE series safety valve is as follows.The area unit is mm2 in the upper line and in2 in the lower line.

Actual area It is our own value and applied when the measured nominal relieving coefficient is used.API area It is the effective orifice area provided for in the API STANDARD 526. Using the actualarea in calculating the relieving capacity of a safety valve is permitted by API520 PART1 5.2.4.

fukui safety valve free sample

Fukui Seisakusho Co global marketing group chief Yoshiyuki Moriyama explains why his company has developed new equipment for MAN Diesel’s two-stroke propulsion system

Fukui hopes to benefit from a growing demand for ME-GI propulsion systems and has developed the RPS-type pilot-operated safety-relief valve for these dual-fuel gas-supply systems.

Our valves aim to deliver superior seat tightness under high pressure. We designed the main valve piston with a larger area on the dome of the piston than on the seat so that the net force holds the piston tightly against the main valve nozzle.

As the operating pressure increases, the net seating force increases and makes the valve tighter. This makes it possible to use the pilot-operated valve where the maximum operating pressure is up to 95 per cent of the set pressure.

The valves are designed to withstand the effects of vibration. The internal components are sealed with o-rings whose elasticity protects the insides of the valve from vibrations from the hardware in the fuel-gas supply system.

The valves aim to offer safer operating action and lower blowdown. The modulate action pilot-operated valve limits the amount of relieving fluid to the amount required to prevent the pressure exceeding the allowable accumulation.

This minimises loss of fuel and the effects of lower reaction force to the hardware compared with pop-action spring-loaded types of valves. The lower-rated blowdown rate of 5 per cent – the valve will close at a pressure of up to 95 per cent of the set value – also improves safety and reduces loss of fuel in case of an emergency.

fukui safety valve free sample

The PSV (Pressurizer Safety Valve) popping test carried out practically in the early phase of a refueling outage has a little possibility of triggering a test-induced LOCA due to a PSV not fully closed or stuck open. According to a KSNP (Korea Standard Nuclear Power Plant) low power and shutdown PSA (Probabilistic Safety Assessment), the failure of a HPSI (High Pressure Safety Injection) following a PSV stuck open was identified as a dominant accident sequence with a significant contribution to low power and shutdown risks. In this study, we aim to investigate the consequences of the NPP for the various accident sequences following the PSV stuck open as an initiating event through the thermal-hydraulic system code calculations. Also, we search the accident mitigation method for the sequence of HPSI failure, then, the applicability of the method is verified by the simulations using T/H system code.

The paper presents the results of the independent analysis of the operational event which took place on 07.11.2003 at Unit 1 of Rostov NPP. The event started with switching off the electrical generator of the turbine due to a short cut at the local switching substation. The turbine isolating valves closed to prevent damage of the turbine. The condenser dump valves (BRU-K) and the atmospheric dump valves (BRU-A) opened to release the vapour generated in the steam generators. After the pressure decrease in the steam generators BRU-K and BRU-A closed but one valve stuck opened. The emergency core cooling system was activated automatically. The main circulation pump of the loop corresponding to the steam generator with the stuck BRU-A was tripped. The stuck valve was closed by the operational stuff manually. No safety limits were violated. The analysis of the event was carried out using ATHLET code. A reasonable agreement was achieved between the calculated and measured values. (author)

In PWR steam generator tube rupture (SGTR) faults, a direct pathway for the release of radioactive fission products can exist if there is a coincident stuck-open safety relief valve (SORV) or if the safety relief valve is cycled. In addition to the release of fission products from the bulk steam generator water by moisture carryover, there exists the possibility that some primary coolant may be released without having first mixed with the bulk water - a process called primary coolant bypassing. The MB-2 Phase II test program was designed specifically to identify the processes for droplet carryover during SGTR faults and to provide data of sufficient accuracy for use in developing physical models and computer codes to describe activity release. The test program consisted of sixteen separate tests designed to cover a range of steady-state and transient fault conditions. These included a full SGTR/SORV transient simulation, two SGTR overfill tests, ten steady-state SGTR tests at water levels ranging from very low levels in the bundle up to those when the dryer was flooded, and three moisture carryover tests without SGTR. In these tests the influence of break location and the effect of bypassing the dryer were also studied. In a final test the behavior with respect to aerosol particles in a dry steam generator, appropriate to a severe accident fault, was investigated

Highlights: ► We modelled the ASTEC input file for accident scenario (SBO) and focused analyses on the behaviour of core degradation. ► We assumed opening and stuck-open of pressurizer relief valve during performance of SBO scenario. ► ASTEC v1.3.2 has been used as a reference code for the comparison study with the new version of ASTEC code. - Abstract: The objective of this paper is to present the results obtained from performing the calculations with ASTEC computer code for the Source Term evaluation for specific severe accident transient. The calculations have been performed with the new version of ASTEC. The ASTEC V2 code version is released by the French IRSN (Institut de Radioprotection at de surete nucleaire) and Gesellschaft für Anlagen-und Reaktorsicherheit (GRS), Germany. This investigation has been performed in the framework of the SARNET2 project (under the Euratom 7th framework program) by Institute for Nuclear Research and Nuclear Energy – Bulgarian Academy of Science (INRNE-BAS).

A safety injection event happened by opening of the Main Steam Safety Valve at Kori unit 1 on April 16, 2005. The safety valves were opened at the lower system pressure than the valve opening set point due to rapid system pressure drop by opening of the Power Operated Relief Valve installed at the upstream of the Main Steam System. But the opening mechanism of safety valve at the lower set point pressure was not explained exactly. So, it needs to be understood about the safety valve opening mechanism to prevent a recurrence of this kind of event at a similar system of Nuclear Power Plant. This study is aimed to suggest the hydrodynamic mechanism for the safety valve opening at the lower set point pressure and the possibility of the recurrence at similar system conditions through document reviewing for the related previous studies and Kori unit 1 event

Full Text Available BACKGROUND Implantation of prosthetic cardiac valves to treat haemodynamically significant valvular diseases has become common; however, it is associated with complications. Thus, this study was intended to evaluate the indications for implantation of prosthetic valve and complications after its implantation and prognosis after treatment of one of its complication, i.e. stuck valve. MATERIALS AND METHODS This was a single-centered study wherein 50 patients who came to the emergency department with stuck valve were assessed. The 2D echocardiography was performed in all patients. Thrombolysis was done and the gradients were reassessed. Further response to treatment and development of complications before and after treatment were observed. RESULTS Of total patients, 60% were females. Mean age group was 30-40 yrs. Most of them were asymptomatic for 6 years and there was lack of compliance in 90% of patients. Most common indication for valve replacement was mitral stenosis (60% followed by mitral regurgitation (20%, aortic regurgitation and aortic stenosis (10% and combined mitral and tricuspid regurgitation (10%. Commonest valve was St. Jude (90%. Pannus was observed in 10% patients and thrombus was observed in 50% patients. Most patients had gradients 45/20 mmHg across mitral valve. In about 90% patients, gradients decreased after thrombolysis (12/5 mmHg. The complications after thrombolysis were hemiparesis (4%, death before thrombolysis (6% and death after thrombolysis (4%. CONCLUSION Considering these results, it can be concluded that prosthetic valves are seldom associated with some complications. Further, thrombolysis can be effective in patients with prosthetic valve thrombosis.

Purpose: To enable the detection of the closing of a safety valve when the internal pressure in a BWR type reactor is a value which will close the safety valve, by inputting signals from a pressure detecting device mounted directly at a reactor vessel and a safety valve discharge pressure detecting device to an AND logic circuit. Constitution: A safety valve monitor is formed of a pressure switch mounted at a reactor pressure vessel, a pressure switch mounted at the exhaust pipe of the escape safety valve and a logic circuit and the lide. When the input pressure of the safety valve is raised so that the valve and the pressure switch mounted at the exhaust pipe are operated, an alarm is indicated, and the operation of the pressure switch mounted at a pressure vessel is eliminated. If the safety valve is not reclosed when the vessel pressure is decreased lower than the pressure at which it is to be reclosed after the safety valve is operated, an alarm is generated by the logic circuit since both the pressure switches are operated. (Sekiya, K.)

After the TMI event efforts were aimed towards improvements in the operational and administrative procedures related to the power operated relief valves (PORVs) in order to decrease the probability of a small-break loss-of-coolant accident (LOCA) caused by stuck-open power operated relief valve. This paper presents a frequency probabilistic analysis of a small break LOCA due to a stuck open PORV and safety valve to the Angra I nuclear power plant in operating conditions pre-TMI and post-TMI. (Author) [pt

... 46 Shipping 2 2010-10-01 2010-10-01 false Opening between boiler and safety valve (modifies PFT-44). 52.20-17 Section 52.20-17 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) MARINE ENGINEERING POWER BOILERS Requirements for Firetube Boilers § 52.20-17 Opening between boiler and safety valve...

The blowdown of a spring loaded safety valve is defined as the difference between the pressure at which the valve opens and the pressure at which the valve fully closes under certain fluid flow conditions. Generally, the blowdown is expressed in terms of percentage of the opening pressure. An extensive series of tests carried out in the EPRI/PWR Utilities Valve Test Program has shown that the blowdown of safety valves can in general be strongly dependent upon the valve geometry and other parameters such as ring adjustments, spring stiffness, backpressure etc. In the present study, correlations have been developed using the EPRI safety valve test data to predict the expected blowdown as a function of adjustment ring settings for geometrically similar valves under steam discharge conditions. The correlation is validated against two different size Dresser valves

In performing the safety analyses for transients that result in a challenge to the reactor coolant system (RCS) pressure boundary, the general acceptance criterion is that the peak RCS pressure not exceed the American Society of Mechanical Engineers limit of 110% of the design pressure. Without crediting non-safety-grade pressure mitigating systems, protection from this limit is mainly provided by the primary and secondary code safety valves. In theory, the combination of relief capacity and setpoints for these valves is designed to provide this protection. Generally, banks of valves are set at varying setpoints staggered by 15- to 20-psid increments to minimize the number of valves that would open by an overpressure challenge. In practice, however, when these valves are removed and tested (typically during a refueling outage), setpoints are sometimes found to have drifted by >50 psid. This drift should be accounted for during the performance of the safety analysis. This paper describes analyses performed by Yankee Atomic Electric Company (YAEC) to account for setpoint drift in safety valves from testing. The results of these analyses are used to define safety valve operability or acceptance criteria

... gov/ency/article/007408.htm Aortic valve surgery - open To use the sharing features on this page, ... separates the heart and aorta. The aortic valve opens so blood can flow out. It then closes ...

In Korean 3 Loop plants a water loop seal pipe is installed containing condensed water upstream of a pressurizer safety valve to protect the valve disk from the hot steam environment. The loop seal water purge time is a key parameter in safety analyses for overpressure transients, because it delays valve opening. The loop seal purge time is uncertain to measure by test and thus 3-dimensional realistic computational fluid dynamics (CFD) model is developed in this paper to predict the seal water purge time before full opening of the valve which is driven by steam after water purge. The CFD model for a typical pressurizer safety valve with a loop seal pipe is developed using the computer code of ANSYS CFX 11. Steady-state simulations are performed for full discharge of steam at the valve full opening. Transient simulations are performed for the loop seal dynamics and to estimate the loop seal purge time. A sudden pressure drop higher than 2,000 psia at the tip of the upper nozzle ring is expected from the steady-state calculation. Through the transient simulation, almost loop seal water is discharged within 1.2 second through the narrow opening between the disk and the nozzle of the valve. It can be expected that the valve fully opens at least before 1.2 second because constant valve opening is assumed in this CFX simulation, which is conservative because the valve opens fully before the loop seal water is completely discharged. The predicted loop seal purge time is compared with previous correlation. (orig.)

... 49 Transportation 4 2010-10-01 2010-10-01 false Safety valves. 229.109 Section 229.109..., DEPARTMENT OF TRANSPORTATION RAILROAD LOCOMOTIVE SAFETY STANDARDS Safety Requirements Steam Generators § 229.109 Safety valves. Every steam generator shall be equipped with at least two safety valves that have a...

This report presents analysis of development emergency operating procedures effectiveness for possible accident on nuclear power plant with WWER-1000 reactor type. Accident initiating event is the primary to secondary circuit leak caused by steam generator primary cover lift-up. In according to conservative assumptions the following additional failures were considered: dump valve BRU-A stuck open failure; loss of external power. The results of this work are represented as a comparative analysis of two possible ways of accident evolution: according to functioning automatic safety systems responses; according to accident management based on development emergency operating procedures with operator intervention. Developed emergency operating procedures assure the following significant goals to mitigate accident sequences: optimal use of ECCS water inventory; severe core damage prevention; mitigation of environment radioactive contamination. (authors)

This paper reports that Conoco Pipeline is using a unique relief valve to reduce costs while improving environmental protection at its facilities. Conoco Pipeline Co. Inc. began testing new relief valves in 1987 to present over-pressuring its pipelines while enhancing the safety, environmental integrity and profitability of its pipelines. Conoco worked jointly with Rupture Pin Technology Inc., Oklahoma City, to seek a solution to a series of safety, environmental, and operational risks in the transportation of crude oil and refined products through pipelines. Several of the identified problems were traced to a single equipment source: the reliability of rupture discs used at pipeline stations to relieve pressure by diverting flow to tanks during over-pressure conditions. Conoco"s corporate safety and environmental policies requires solving problems that deal with exposure to hydrocarbon vapors, chemical spills or the atmospheric release of fugitive emissions, such as during rupture disc maintenance. The company had used rupture pin valves as vent relief devices in conjunction with development by Rick Austin of inert gas methods to protect the inner casing wall and outer carrier pipeline wall in pipeline road crossings. The design relies on rupture pin valves set at 5 psi to isolate vent openings from the atmosphere prior to purging the annular space between the pipeline and casing with inert gas to prevent corrosion. Speciality Pipeline Inspection and Engineering Inc., Houston, is licensed to distribute the equipment for the new cased-crossing procedure

By the nature of its design, the set point and lift of a conventional spring loaded safety relief valve are sensitive to back pressure. One way to reduce the adverse effects of the back pressure on the safety relief valve function is to install a balanced bellows in a safety relief valve. The metallic bellows has a rather wide range of manufacturing tolerance which makes the design of the bellows safety relief valve very complicated. The state-of-the-art balanced bellows safety relief valve can only substantially minimize, but cannot totally eliminate the back pressure effects on its set point and relieving capacity. Set point change is a linear function of the back pressure to the set pressure ratio. Depending on the valve design, the set point correction factor can be either greater or smaller than unity. There exists an allowable back pressure and critical back pressure for each safety relief valve. When total back pressure exceeds the R a , the relieving capacity will be reduced mainly resulting from the valve lift being reduced by the back pressure and the capacity reduction factor should be applied in valve sizing. Once the R c is exceeded, the safety relief valve becomes unstable and loses its over pressure protection capability. The capacity reduction factor is a function of system overpressure, but their relationship is non-linear in nature. (orig.)

A study of the modeling techniques adequate for simulating the loss of coolant accident caused by stuck open pressurizer relief valves, using the RELAP4-MOD5 code, is performed and the model developed is applied to the analysis of this kind of accident for the Central Nuclear Almirante Alvaro Alberto Unit (Angra 1). The thermal hydraulic behavior of the reactor cooling system, when subjected to a loss of main feedwater followed by the failure in the open position of two pressurizer relief valves, is determined. The relief valves are assumed to fail in the totally open position, delivering the maximum massflow through the discharge line. The RELAP4-MOD5 code is shown to be adequate for this kind of analysis, and the detailed prediction of the thermal hydraulic behavior of the Reactor Coolant System is thus possible. The eficiency of the emergency core cooling system of Angra 1 is demonstrated, the fuel elements remaining covered by the coolant during all the accident, and the peak clad temperatures are kept within design limites, ensuring the integrity of the core. (Author) [pt

The Safety Valve Handbook is a professional reference for design, process, instrumentation, plant and maintenance engineers who work with fluid flow and transportation systems in the process industries, which covers the chemical, oil and gas, water, paper and pulp, food and bio products and energy sectors. It meets the need of engineers who have responsibilities for specifying, installing, inspecting or maintaining safety valves and flow control systems. It will also be an important reference for process safety and loss prevention engineers, environmental engineers, and plant and process designers who need to understand the operation of safety valves in a wider equipment or plant design context. . No other publication is dedicated to safety valves or to the extensive codes and standards that govern their installation and use. A single source means users save time in searching for specific information about safety valves. . The Safety Valve Handbook contains all of the vital technical and standards informat...

How to set policy in the presence of uncertainty has been central in debates over climate policy. Concern about costs has motivated the proposal for a cap-and-trade program for carbon dioxide, with a "safety valve" that would mitigate against spikes in the cost of emission reductions by introducing additional emission allowances into the market when marginal costs rise above the specified allowance price level. We find two significant problems, both stemming from the asymmetry of an instrument that mitigates only against a price increase. One is that most important examples of price volatility in cap-and-trade programs have occurred not when prices spiked, but instead when allowance prices collapsed. Second, a single-sided safety valve may have unintended consequences for investment. We illustrate that a symmetric safety valve provides environmental and welfare improvements relative to the conventional one-sided approach.

The LOFT pressurizer self-actuating safety-relief valves are constructed to the present state-of-the-art and should have reliability equivalent to the valves in use on PWR plants in the U.S. There have been no NRC incident reports on valve failures to lift that would challenge the Technical Specification Safety Limit. Fourteen valves have been reported as lifting a few percentage points outside the +-1% Tech. Spec. surveillance tolerance (9 valves tested over and 5 valves tested under specification). There have been no incident reports on failures to reseat. The LOFT surveillance program for assuring reliability is equivalent to nuclear industry practice.

The pressurizer relief and safety valve system provides the reactor coolant system overpressure protection and, therefore, it is fundamental for the security of a nuclear plant. This paper discusses the safety valve loop seal strategies adopted by others nuclear power plants over the world in order to attend the recommendations of NUREG-0578 (TMI-2 Lessons Learned Task Force Status Report and Short Term Recommendations). The technical option adopted for Angra 1 consists in making specific modifications on the original piping and support configuration of the pressurizer relief and safety valve system. These modifications were proposed in order to reduce the high stress levels induced by the thermal-hydrodynamic loads caused by the discharge of the sub-cooled water during the opening of the relief or the safety valves. Several thermal-hydraulic models were tested to assess the influence of the seal water heating and the simultaneous opening of the valves in order to minimize the thermal hydrodynamic loads effects. The piping structural analysis was performed, using the computer program system KWUROHR, to satisfy the requirements of the appropriate equations of the code ASME Section III, Subsections NB3650 and NC3650. (author)

The stresses in the main steam branch pipe of a Boiling Water Reactor due to safety/relief valve blowdown has been measured from an in situ piping system test. The test results were compared with analytical results. The predicted stresses using the current state of art analytical methods used for BWR SRV discharge transient piping response loads were found to be conservative when compared to the measured stress values. 3 refs

... 46 Shipping 2 2010-10-01 2010-10-01 false Boiler safety valves. 61.05-20 Section 61.05-20 Shipping... INSPECTIONS Tests and Inspections of Boilers § 61.05-20 Boiler safety valves. Each safety valve for a drum, superheater, or reheater of a boiler shall be tested at the interval specified by table 61.05-10. [CGD 95-028...

Real-time three-dimensional transesophageal echocardiography (RT3D-TEE) can provide unique visualization and better understanding of the relationship among cardiac structures. Here, we report the case of an 85-year-old woman with an obstructed mitral prosthetic valve diagnosed promptly by RT3D-TEE, which clearly showed a leaflet stuck in the closed position. The opening and closing angles of the valve leaflets measured by RT3D-TEE were compatible with those measured by fluoroscopy. Moreover, RT3D-TEE revealed, in

fukui safety valve free sample

You Might Also Be Interested In