farris safety valve series 2600 for sale

Farris’s pressure relief valves are designed to automatically protect your equipment against excessive overpressure. The Series 2600 pressure relief valves are designed to function equally well on air, gases, steam, or liquid service.

The pressure relief valve design incorporates several features which allow this valve to take a maximum amount of piping strain without hampering the functional characteristics of the valve or contributing to serious leakage.

The superior strength built into the body of the Farris pressure relief valve to resist these discharge piping strains materially reduces the deflection and distortion in the valve and reduces the leakage encountered, when at times, discharge piping strains become excessive.

The valve is engineered for exceptional tightness because of positive alignment, a high strength disc design, the elimination of thermal distortion and

It is a valve that is designed to detect and prevent changes in pressure which could lead to damage and failure in a number of applications. If the desired pressure is exceeded, the valve releases the excess pressure.

Series 2600 Farris Engineering Products and Services Pressure Relief Valves

Process Pressure Relief Valves Series 2600 ASME NB Certified for Air, Steam, and Water Series 3800 ASME NB Certified for Air, Steam, and Water Series 2700 ASME NB Certified for Air, Steam, and Water Series 1890/1896M ASME NB Certified for Air, Steam, and Water Series 2850/2856 ASME NB Certified for Air and Steam

Steam Safety Valves Series 4200 ASME NB Certified for Steam – Section I & VIII Series 6400/6600 ASME NB Certified for Steam – Section I & VIII

SizeMaster™ Mark IV Pressure Relief Valve Engineering Software for Sizing and Selection

FAST Centers (Farris Authorized Service Team) The following is a list of Farris approvals"Understanding what the Customer wants...making it happen!" currently on record:• Worldwide Network of Service Centers with Factory Trained Technicians • ASME “V”, “UV” and “NV” approvals• Local Inventory with 24 hour a day / 7 day a week support • National Board “NB” approval• Access to Worldwide Farris Inventory through the Web • ISO 9001-2000• ASME/National Board approved Assembly & Test Facilities • US Coast Guard approval• Application and Sizing & Selection Support • PED 97/23/EC (European Pressure Equipment Directive) • ATEX 94/9/EC (European Potentially Explosive Atmospheres) • Canadian TSSA Registration • China Safety Quality License • Russian GOSH-R and GGNT (Russian Certification and Permits) • First Point Assessment Limited

10195 Brecksville Road, Brecksville, OH 44141 USA • Telephone: 440-838-7690 • Fax: 440-838-7699 • www.farrisengineering.comFacilities: Brecksville, OH USA, E. Farmingdale NY USA, Brantford, Ontario CANADA, Bridport, UKOffices worldwide. For a listing of our global sales network, visit our website at www.farrisengineering.com.

While this information is presented in good faith and beleived to be accurate, Farris Engineering does not guarantee satisfactory results from reliance upon such information.Nothing contained herein is to be construed as a warranty or guarantee, expressed or implied, regarding the performance, merchantability, fitness or any other matter withrespect to the products, nor as a recommendation to use any product or process in conflict with any patent. Farris Engineering reserves the right, without notice, to alter orimprove the designs or specifications of the products described herein.

© 2006 Farris Engineering Printed in USA R1 10M 0806Introduction Table of Contents

This catalog covers Series 2600, 2600S and 2600L General Page rangePressure Relief Valves including the latest infor­mation The Farris Advantage......................................................................1-7 Technical Information.........................................................................8available to assist you in the sizing and selection of the Definitions..........................................................................................9proper valves for your application. ScopeFarris pressure relief valves have over a half century Type Numbering System............................................................. 10-11 Ordering Information, Replacements............................................... 11of proven performance providing auto­matic and Standard Bills of Material............................................................ 12-13positive protection against overpressure in thousands Liquid Code Certified Design........................................................... 14 Series 2600S Exposed Spring......................................................... 15of industrial plants and facilities worldwide. Our BalanSeal®/Piston Design................................................................ 16earned reputation as “the First Line of Safety” is the Heat Transfer Fluid Service/Low Temperature................................. 17 Corrosive and Low Temperature Materials..................................18-20result of countless Farris innovations combined with Sour Gas (H2S) Materials.................................................................21progressive engineering, sound design and high O-Ring Seat Pressure Seal.........................................................22-23 Orifice Selection Tables and Charts, U.S. Units......................... 24-38quality production. Orifice Selection Tables and Charts, Metric Units...................... 43-56 Super Capacity Valve Scope...........................................................61 Super Capacity Bills of Materials............................................... 62-63Our headquarters and manufacturing facility located Valve Pressure Limits (Special Materials)................................... 79-83in Brecksville, Ohio, oversees the production of thesesuperior valves at plants in the United States, Canada Capacity Tables Air 10% Overpressure (U.S./S.I.)................................................ 39/57and the United Kingdom. Our associated facility in Steam 10% Overpressure (U.S./S.I.).......................................... 40/58Australia is also equipped with precision machinery Water 10% Overpressure (Code 2600L) (U.S./S.I.).....................41/59 Water 25% Overpressure (Non Code) (U.S./S.I.)....................... 42/60and controlled by rigid inspection and standards to Super Capacity 2600 Series Overpressure, U.S. Units.............. 64-65produce quality pressure relief valves to meet your Super Capacity 2600 Series Overpressure, Metric Units........... 66-67needs. The Brecksville facility is also responsible forresearch and development, engineering, manufac- Accessories Cap and Lever Materials..................................................................68turing technology, and sales and marketing. We offer Test Gag Installations.......................................................................69the services of our engineering sales representatives Remoter, Bugproof Vent and Valve Position Indicators....................70 Steam Jacketing Methods............................................................... 71throughout the world as well as our Farris AuthorizedService Teams (FAST Centers) and headquarters staff Dimensions and Weightsto extend you every possible customer service. Valve Dimensions and Weights................................................... 72-75 ANSI Flange Dimensions............................................................76-77 DIN Flange Dimensions....................................................................78

Sizing Guarantee Sizing Equations and Nomenclature................................................84 All products manufactured by Farris Engineering, a division of Conventional Valves.........................................................................84 Curtiss-Wright Flow Control Corporation, are guaranteed free of BalanSeal Valves..............................................................................85 defects in material and workmanship for a period of one year Fluid Data.........................................................................................86 when used within the recommended range. When authorized, Sizing Factors for Vapors & Gases...................................................87 any defec­tive product may be returned to the Factory, and if Sizing Factors for Steam..................................................................88 Sizing Factors for Liquids........................................................... 89-91 found defective, will be repaired or replaced free of charge, F.O.B. Conversion Factors..........................................................................92 our Factory. No charge for labor or other expense incurred will be allowed as the ­ liability of Farris Engineer- Other Farris Engineering Products and Services ing is measured by the refund price of the Pressure Relief Valves and Test Stand.............................................93 defective product only. SizeMaster™ Sizing and Selection Software..................... back cover FAST Service Centers........................................................ back cover

Farris pressure relief valves are designed to automatically protect your equipment against excessive overpressure. Every care is taken in the development, design and production of these valves to ensure com- plete dependability in performance. Our constant objective is to provide a superior valve that will assure ultimate protection at the lowest cost, both initially and throughout its service life.

• Twenty-four hour/seven-day customer support is achieved via our FAST Centers and our Web-based CW Commerce Program accessible to all Farris Representatives.

Valve SelectionThis catalog simplifies the sizing and selection of Series 2600 process pressurerelief valves. The pressure relief valves are presented here in an easy-to-understand format. Unless otherwise stated, references made to the Coderefer specifically to ASME Section VIII, Division 1.

Certified Capacity Code ComplianceThe Series 2600 pressure relief valves have been carefully constructed andtested in accordance with the requirements of the ASME Pressure Vessel Code,Section VIII. Their capacity rating for the applicable fluids is certified by theNational Board of Boiler and Pressure Vessel Inspectors.

Range of Service Application Approx. Opening PressureSeries 2600 pressure relief valves are designed to function equally well on air, Approx. Closing Pressure 100gases and steam or in liquid service. For specific Code applications in liquid

% of Set Press. 90service, Farris 2600L relief valves offer superior performance. This catalog 80covers orifice ranges “D” through “Z”.

Balanced Farris BellowsThe Farris full nozzle pressure relief valvedesign (Fig 1) incorporates a nozzle shape to Figure No. 2Aprovide:

Balanced Bellows DesignBoth the Farris BalanSeal balanced bellows (Fig 2A) and the BalanSeal/Pistonpressure relief valve provide consistent capacity, set pressure and blow downat elevated backpressure encountered when valves discharge into headersor where other devices produce variable backpressure in the relief manifoldsystem. Nozzle can be removed from Body with the Blowdown Ring attached. Approx. Opening PressureThe Farris BalanSeal design permits simple conversion of conventional Approx. Closing Pressureconstruction valves to BalanSeal balanced bellows construction by adding a 100 % of Set Press.

The “D” and “E” orifices are available with balanced bellows through the class600 inlet, with higher class valves available in an unbalanced bellows design(Fig 2B). The unbalanced bellows is used for corrosion isolation applications, % of Back Pressure

Resistance to Discharge Piping Strains For most pressure relief valves, and particularly for those from which the discharge must be piped away to a remote location, it is almost impossible to keep piping strains away from the valve. The superior Farris pressure relief valve design incorporates several features which allow this valve to take a maximum amount of piping strain without hampering the functional characteristics of the valve or contributing to serious leakage. Threaded connection of nozzle located in 1. The threaded connection between the valve nozzle and the valve inlet inlet flange to avoid distortion on the nozzle flange is located low in the flange so that any distortion which may take seating surface. place at the inlet neck of the body is not transmitted to the valve nozzle. Figure No. 3 This eliminates the effect of the distortion on the nozzle seating surface and the subsequent serious leakage through the valve (Fig 3).

If connected to a closed system, specific 2. The accurate guiding in the Farris design, using the double universal ball care should be taken to keep piping strains joint construction above and below the sleeve guide, will allow the disc seat away from the pressure relief valve under all to align itself positively with the nozzle seat in cases where the discharge conditions of process operation. piping strains cannot be avoided and have forced the upper portion of the valve out of exact alignment (Fig 4 & 5).

Cap may be 3. The superior strength built into the body of the Farris pressure relief valve to required for resist these discharge piping strains materially reduces the deflection and weather protection distortion in the valve and reduces the leakage encountered, when at times Support to resist weight discharge piping strains become excessive. and reaction forces Long radius elbow In spite of these features, however, it is advisable to minimize the discharge Pressure piping strain on any pressure relief valve. It is our recommendation that piping relief engineers eliminate these discharge piping strains as much as possible under valve all operating conditions. Additional information on allowable external loads is provided in the Farris Technical Recommendations publication.

Isolation of Bonnet Spring Chamber Vessel The Farris pressure relief valve huddling chamber is engineered to extract the flow forces required to overcome the force of the spring as well as the forces resulting from the body and bonnet pressure when the valve is open. In other designs, the use of eductor tubes, venting the guide directly into the valve body, or other techniques are used in an attempt to keep the huddling chamber or Figure No. 4 body pressure away from the topside of the disc to obtain full lift and capacity. These designs may have undesirable effects on valve performance, life and maintenance. Special attention should be given in the following cases:1. High Temperature. In Farris pressure relief valves on high temperature service, there is no induced or forced flow of the hot lading fluid into the bonnet spring chamber, so relaxation of the spring due to high temperature does not occur as rapidly as it does in other valve designs. As a result, blow down in the Farris valve is stabilized for longer flowing periods than in competitive designs.2. Corrosive Service. In Farris pressure relief valves on corrosive service, there is no induced or forced flow of the corrosive lading fluid past the guiding surfaces during valve operation. This reduces the corrosive effect of the lading fluid on the guiding surfaces and valve spring, so lowering the frequency of galling and spring failure with the accompanying reduction of maintenance costs and unscheduled downtime.3. Dirty Service. Where small foreign particles can be carried in the gas or vapor stream, there is no induced or forced flow in the Farris design carrying these small particles between the guiding surfaces. Galling of the guide surfaces, which frequently causes the valve to “hang” or “freeze” in either an open or closed position, is eliminated.The Farris design avoids all these difficulties by discharging directly from the huddling chamber into the valve bodywithout inducing flow past the guiding surfaces into the spring chamber or forcing flow past the guiding surfaces becauseof the large pressure drop between the huddling chamber and the valve body.

Integral Sleeve Guide All stainlessThe Farris pressure relief valve design incorporates an integral sleeve steel stem constructionguide (Fig 5), assuring continual positive alignment after the part has beenmanufactured, and including the same high corrosion resistant properties in Positive connection of partsthe guide flange that are present in the sleeve portion of the guide. The sleeveguide is extended above the top of the guide flange, minimizing the possibilityof corrosive or other foreign particles washing onto the guiding surfaces Drainagewhen the valve is relieving or when it is “breathing” as a result of atmospheric Sleeve guide openingstemperature changes. Openings are provided in the guide flange to allow these flangesolid particles to leave the bonnet, preventing them from passing between the Sleeve Positive connection of partsguiding surfaces and causing galling. guide

TightnessIn a spring loaded pressure relief valve, the force exerted by the systempressure under the valve disc approaches the opposing spring force on top ofthe valve disc as the system operating pressure nears the set pressure of thevalve. Since the operating pressure of the system is often 90% of the valve set Integral Sleeve Guidepressure, the differential force holding the seats together is quite small. Figure No. 5There are several factors which affect the tightness of the spring loadedpressure relief valve, including alignment, disc strength, thermal distortion, andpreparation of seating surfaces. The Farris valve is engineered for exceptionaltightness because of positive alignment, a high strength disc design, theelimination of thermal distortion and optimum seating surface finish. Self-aligning discPositive Alignment. Using the double universal joint, 21⁄2 to 1 guiding ratio,and self-aligning disc, positive alignment of internal parts is achieved. Mis-alignment is avoided, improving tightness and eliminating other undesirableeffects such as long blow down.

High Strength Disc Design. In the Farris valve, the thickness of the self- High Strength Discaligning disc (Fig 6) is no greater than necessary; however, the same thicknessis maintained for all catalog materials. For purposes of strength, the disc is Figure No. 6strong enough in bending moment for all materials shown in the catalog.Valves constructed with hardened discs are exceptional in withstanding theeffects of impact, an advantage where installation or process conditions maycause chatter.

Elimination of Thermal Distortion. In a pressure relief valve, especially on high or low temperature service, a singlelarge disc, with its top surface exposed to atmospheric temperature when the valve is closed, has a temperature gradientbetween the surface contacted by the lading fluid and the surface contacted by the ambient temperature in the valvebody or bonnet. This temperature gradient induces thermal stresses in a heavy disc that can cause deformation of theseating surfaces and consequent leakage of the valve.

The Farris self-aligning disc is essentially encased in a disc holder with contact at only one central point, so thatthe conduction or convection of heat around the disc is quite low. As a result, the thermal stresses at the seatingsurface practically disappear. This gives further assurance of tightness over the range of temperatures used in variousoperations.

Optimum Seating Surface Finish. Seat surfaces are machine lapped and polished to produce flatness (as measuredwith optical flats) that deviates less than eleven millionths of an inch from a true plane, with a surface finish of five microinches or less. Regardless of the seating surfaces, maximum tightness will not be achieved unless positive alignmentand elimination of thermal distortion are integral design features of the valve.

All Stainless Steel Stem Construction The Farris two-piece design of disc holder and stem ­retainer features a positive locking device called the discThe Farris pressure relief valve design features an all holder lock screw. Any attempt to disassemble these partsstainless steel stem. This construction cost-effectively causes the lock screw to lock tighter, unless first disen-eliminates dangerous sticking due to galvanic corrosion at gaged. The lock screw provides a positive lock betweenthe upper guiding point in the spring adjusting screw. The these two parts that makes them equivalent to a single partcareful design of this upper bearing also ensures proper but without the associated disadvantages. The two-piecealignment and optimum freedom from galling and erratic assembly allows conversion to bellows construction at apopping. minimal investment. The two-piece design also allows the stem retainer to be constructed of less corrosion-­resistantPositive Connection of Parts material than the disc holder, when a bellows is installed to isolate the moving parts. When maintenance requiresThe Farris design incorporates a positive connection be- parts replacement, the entire assembly will not need re-tween the valve stem and the stem retainer as well as be- placement if only one piece is damaged.tween the disc and disc holder (Fig 7). These connectionsare made with a male threaded head which threads into aportion of a female socket through which it drops free into Convertibility of Designan undercut chamber to make bearing contact on a spher- The Farris pressure relief valve is available as a conven-ical surface. This allows complete freedom of action for tional valve and as a BalanSeal (balanced bellows) valve.alignment purposes while retaining the positive connec- The conversion of this valve from conventional to Balan­tion of the threads. It also eliminates the need to use snap Seal, or vice versa, requires only the addition or removalring connections which, in some cases, are not sufficiently of the balanced bellows and bellows gasket in the valve,positive during valve operations and may be inadvertently and the coincidental removal or replacement of a pipe plugleft out during maintenance. in the valve bonnet vent. No other parts are required and all other parts are completely interchangeable. This unique All Stainless Steel feature is offered in orifices “F” through “T”. Stem Construction Positive Connection In addition, the bonnet of the valve is constructed so that of Parts all valves can be equipped with a plain screwed cap, bolted cap, an open lever or packed lifting lever without changing Drainage Openings any other valve parts or fully disassembling the valve. Sleeve Guide Flange Positive Connection Body and Bonnet of Equal Materials Sleeve Guide of Parts Although the Farris pressure relief valve does not induce circulation of the lading fluid through the bonnet, the bonnet and the valve body are made of the same high quality steel. It is important that both the body and bonnet be made of materials suitable for the service in which the valve will be used, especially in the case of high temperature services.

Steam Jacketing for Better Heat TransferIn modern process plants, it is necessary to keep somevalves and lines warm at all times to avoid solidification ofthe lading fluid and to guarantee the safety of equipment.Farris offers a steam jacket (Fig 8) to substantially increasethe rate of heat transfer into the valve and, at the sametime, simplify the problem of removing or dismantling thevalve for maintenance. This design offers a separate two-piece jacket that installs on a standard valve body. Seedetails on page 71.

Simple, Accurate AdjustmentsThe single Blow Down Ring construction of the Farrispressure relief valve allows simple shop or field setting,­something not possible with multiple ring valve types.

In most process plants, it is not possible or economicalto test the pressure relief valve in place on the process Steam Jacketed Bodyequipment, so the valve is tested while mounted on amaintenance shop test stand where the pressure and Figure No. 8volume for testing are often limited. With the Farris design,the single Blow Down Ring is adjusted in the maintenanceshop so that the set pressure point can be observed.After the set pressure is established, the Blow Down Ringis adjusted to a lower empirically predetermined or fieldestablished position depending on set pressure, size andlading fluid (Figs 9A, 9B). Blow Down Ring settings and testequipment recommendations are detailed in maintenancemanuals published by Farris Engineering.

Interchangeability of PartsIn the Farris pressure relief valve design, maximum inter­changeability of parts is maintained in order to reduce thenumber of spare parts needed and keep spare parts inven-tories to a minimum.

Standard Flanged Connections the set pressure at ambient conditions to compensate for higher operating temperatures as indicated in the following1. All steel raised face flanges are supplied with a serrated table. spiral finish with 45 to 55 grooves per inch and a finish between 125 and 160 AARH.2. All ring joint flanged facings are supplied for octagonal All Service Fluids or oval gaskets. Operating % Increase in Set Pressure3. Facings other than raised face or large male can be Temperature At Atmospheric Temperature supplied at additional cost. -450° F to 300° F None4. Flange ratings that conform to ANSI B16.5 are indicated 301° F to 600° F1% on each Orifice Selection Table. Heavier outlet flanges 601° F to 900° F2% can be supplied at additional cost. For flange dimen- 901° F to 1200° F3% sions, see ANSI Dimension Table, page 77.5. Drilling of all flanges always straddles the valve center Steam service valves are tested on steam by the line. manufacturer and require no additional temperature compensation. Where the set pressure is above the production steam test facility limits, Section VIII steamValve Trim valves may be tested on air. When steam valves are testedTrim is a term that generally refers to internal parts of a on air, compensation shown in the All Service Fluids Tablepressure relief valve. Unless noted, valve trim in a Farris should be used.pressure relief valve specifically includes the nozzle anddisc only. Standard bills of materials for all 2600 Seriesvalves are located on pages 12 and 13. For low tempera- Low Pressure Settingsture and corrosive service materials, see pages 17 through Low set pressure limits are indicated in the following table.21. If other than standard trim or metallurgy is required, These limits apply to both metal-to-metal and O‑ring seatthis must be specified. construction. Low pressure settings may be governed by valve design and performance and/or Code application limits. Pressure vessels having operating pressures notDifferential Between Operating and Set Pressure exceeding 15 psig are not considered within the scope ofFor best performance in process applications, we recom- the ASME Code, Section VIII. Accordingly, pressure reliefmend pressure relief valves be set to open at a minimum valve requirements for such applications are governed byof 10% or 25 psig above the operating pressure. A suit- other Codes and Standards that should be consulted.able margin above the operating pressure should be pro- The sizing equations for compressible fluids providedvided in order to prevent any unintended operation of the herein are valid for sonic flow conditions and should not bepressure relief valve. Refer to ASME Section VIII Pressure used to size pressure relief valves for applications in whichVessel Code, Appendix M, Paragraph M-10, Pressure Dif- subsonic (below 15 psig) flow conditions may exist. Lowferentials for Pressure Relief Valves as well as to Farris pressure applications can be reviewed by the Factory andTechnical Recommendations for complete information. special valves provided to meet those requirements.In the case of pump and compressor discharge lines, a Low Set Pressuregreater differential is recommended if possible, since Valve Series Construction Limit (psig)pulsations within the system can result in faulty valveoperation. Consequently, the pressure relief valve should 2600be set as high above the discharge line pressure as 2600S Conventional15possible. 2600L

2600Set Pressure Compensation for Temperature 2600S BalanSeal15*An increase in temperature causes a reduction of valve set 2600L BalanSeal/Pistonpressure as a result of the direct effect of temperature on the 2600 Bal/Pistonspring and expansion of body and bonnet which reducesspring loading. Since pressure relief valves are invariably *Low set pressure limit for “D” and “E” orifice BalanSeal (balanced bellows) valves aretested at atmospheric temperature, it is customary to adjust 50 psig and 25 psig respectively.

Safety Valve – an automatic pressure relieving MaximuM Allowable Working Pressure–device actuated by the static pressure upstream of the the maximum gage pressure permissible in the top of avalve, and characterized by rapid full opening or pop completed vessel in its operating position for a designatedaction. Used for steam, gas or vapor service. temperature. This pressure is based on calculations for each element in a vessel using nominal thicknesses,Relief Valve – an automatic pressure relieving device exclusive of allowances for corrosion and thicknessesactuated by the static pressure upstream of the valve, required for loadings other than pressure. It is the basiswhich opens in proportion to the increase in pressure over for the pressure setting of the pressure relieving devicesthe opening pressure. protecting the vessel. The design pressure may be used in place of maximum allowable working pressure in casesSafety Relief Valve – an automatic pressure where calculations are not made to determine the value ofactuated relieving device suitable for use as either a safety the latter.or relief valve, depending on the application. Overpressure – a pressure increase over the setPressure Relief Valve – a pressure relief device pressure of a pressure relief valve, usually expressed as adesigned to re-close and prevent the further flow of fluid percentage of the set pressure.after normal conditions have been restored. Accumulation – the pressure increase over theSet Pressure – in pounds per square inch gage, the maximum allowable working pressure of the vessel duringinlet pressure at which the pressure relief valve is adjusted discharge through the pressure relief valve, expressed as ato open under service conditions. In a safety or safety relief percent of that pressure or in pounds per square inch.valve in gas, vapor or steam service, the set pressure isthe inlet pressure at which the valve pops under service Blow down – the difference between actual poppingconditions. In a relief or safety relief valve in liquid service, pressure of a pressure relief valve and actual reseatingthe set pressure is the inlet pressure at which the first pressure, expressed as a percentage of set pressure or insteady steam flows from the valve perpendicular to the pressure units.outlet. Lift – the actual travel of the disc away from closedDifferential Set Pressure – the pressure position when a valve is relieving.differential, in pounds per square inch between the setpressure and the constant superimposed back pressure. Back Pressure – the static pressure existing at theIt is applicable only when a conventional type safety outlet of a pressure relief device due to pressure in therelief valve is being used in service against a constant discharge system.superimposed back pressure. Constant Back Pressure – back pressureCold Differential Test Pressure – in that does not change appreciably under any conditionpounds per square inch gage is the inlet static pressure of operation whether the pressure relief valve is closed orat which the pressure relief valve is adjusted to open on open.the test stand. This pressure includes the corrections forservice conditions of back pressure or temperature, or Variable Back Pressure – refer to the discus-both. sion on BalanSeal valves on page 85.

Prefix 26 D A 1(if applicable) Series Orifice Construction Temperatures & Materials Number Areas AH Designates Orifice Area, Sq. In. Area, Sq. mm*

Designation Conventional Designates high Series 2600 cast Letter API Actual API Actual Inlet Material construction pressure versions. steel flanged D 0.110 0.150 71 97 Temperature Body & Range °F Bonnet SpringUsed for “Q”, “R”, pressure relief& “T” orifices only. valves E 0.196 0.225 126 145 B F 0.307 0.371 198 239 BalanSeal construction Carbon Chrome G 0.503 0.559 325 361 1 -20 to 800 C Steel Alloy H 0.785 0.873 506 563 Conventional with Carbon Chrome J 1.287 1.430 830 923 2** 451 to 800 O-ring seat pressure Steel Alloy K 1.838 2.042 1186 1317 seal Chrome Moly High Temp. L 2.853 3.170 1841 2045 3 801 to 1000 M 3.60 4.000 2323 2581 D Steel Alloy N 4.34 4.822 2800 3111 BalanSeal with O-ring 4* 1001 to 1200 — — seat pressure sealOur type numbering P 6.38 7.087 4116 4572 5* 1201 to 1500 — — Q 11.05 12.27 7129 7916 E 1 -21 to -75 Use “S3” Trim Optionssystem simplifies R 16.0 17.78 10323 11471 BalanSeal with 1 -76 to -450 Use “S4” Trim Options T 26.0 28.94 16774 18671 auxiliary balancingthe selection and U — 31.5 — 203.2 piston * Temperature ranges 4 and 5 are beyond the W — 63.62 — 410.2 scope of this catalog. Consult the Factory. Fspecifying of Farris W2 — 104.0 — 670.8 BalanSeal with auxiliary ** Temperature range 2 is no longer used as the X — 113.1 — 729.5 standard range valve handles temperatures to balancing piston and O- 800°F.pressure relief valves Y — 143.1 — 923.0 ring seat pressure seal Z — 176.7 — 1139.7because the digits that Note:The “U” through “Z” orifices are not T Teflon seat, API Standard Sizes.comprise a specific * “U” through “Z” metric areas in conventional square centimeters. Utype number have a Teflon seat, BalanSeal

distinct significance.The digits describe Ordering Information Parts Replacementthe basic valve series, To process your order properly and promptly, Valves – If an exact replacement valve is re- please specify the following: quired, then the valve type, size and serial numberorifice, seat and 1. Quantity* must be specified to ensure proper dimensionsinternal construction, 2. Inlet and outlet size and material being supplied. If a specific valve 3. Farris type number* is obsolete, a recommendation of the currentinlet temperature 4. Inlet and outlet flange class and facing equivalent will be made if possible. 5. Materials of construction, if other than standardrange, body, bonnet 6. O-ring seat pressure seal material, if required Spare Parts – When ordering parts, use part 7. Set pressure* names as listed in the bills of materials. Specifyand spring material, 8. Maximum inlet temperature* valve type, size and serial number. If the serial 9. Allowable overpressure* number is not available, the original Farris factoryinlet flange class and 10. Fluid and fluid state* order number will help us supply the proper part 11. Back pressure, superimposed constant and/or and material.Code liquid design. variable and built-up* Springs – Order as an assembly to include spring 12. Required capacity* with upper and lower spring buttons. Specify 13. Accessories valve type, size, serial number, set pressure and (a) Bolted cap, open or packed lever backpressure, if any. (b) Test gag Note: If valve modification or set pressure changes are (c) Remoter required, consideration must be given to correct the 14. Code requirements, if any nameplate and other data. *As a customer service, we verify your selection and sizing. If you want this service, you must include this information.

ANSI steam and gas service Raised Face, ANSI Std. Bolted Cap.............................3 Gag..........0 for Corrosive Nominal Inlet B–Expanded API sizes: ASME (125 to 160 AARH).............1 Packed Lever.........................4 With Gag.....1 Service Table Flange Class liquid valve Large Female, ANSI Std.........2 Open Lever............................7 below. C–Expanded API sizes: ASME Small Male, ANSI Std.............3 Remoter (with Packed 0 150 Code Section VIII exposed Small Female, ANSI Std.........4 Lever).................................8 spring design Large Tongue, ANSI Std.........5 1 300 lightweight D–Valve suitable for heat Large Groove, ANSI Std.........6 valve transfer service-vapor Small Tongue, ANSI Std.........7 E– Valve suitable for heat Small Groove, ANSI Std.........8 2 300 heavyweight transfer service-liquid Ring Joint (octagonal), valve F– Expanded API size valves ANSI Std.............................9 3 600 suitable for heat transfer 63-83 AARH Smooth service-vapor Finish RF............................ H 4 900 G–Expanded API size valves suitable for heat transfer Although not applicable to the 5 1500 service-liquid Inlet facing only, the following 6 2500 L– ASME Code certified for first digit letters are also used: liquid service only 63 to 83 AARH S–ASME Code Section VIII (outlet only)........................ J exposed spring design 63 to 83 AARH *Letter suffixes for expanded API (inlet & outlet).....................K sizes where 2 1/2” inlet or outlet has been replaced.

/H3 Hastelloy C Hastelloy C Hastelloy C 316 buttons, Chrome Alloy or High Temperature Alloy Nickel Plated spring /H4 Hastelloy C Hatelloy C Hastelloy C Hastelloy C /M1 Standard Monel Standard Standard /M2 Standard Monel Monel 316 buttons, Chrome Alloy or High Temperature Alloy Nickel Plated spring /M3 Monel Monel Monel 316 buttons, Chrome Alloy or High Temperature Alloy Nickel Plated spring /M4 Monel Monel Monel Inconel spring, Monel buttons /N1 Carbon Steel (NACE) 316 (NACE) 316* Standard3 /N4 316 (NACE) 316 (NACE) 316* 3163* Spring adjusting screw in standard materialGeneral Notes:1. Other special materials, such as 316L stainless steel and Alloy 20, as well as non-standard outlet flange classes are available upon request. In these instances, suffix code “/SP” is used with a brief description of the special requirements.2. Special inlet facings include, but are not limited to, socket or butt weld ends, lens joint and Grayloc® fittings. Grayloc is a registered trademark of Grayloc Products, a division of ABB Vetco Gray Inc. 113. The springs shown assumes bellows construction. For conventional construction, use Inconel X750.®2600 Series Conventional

General Notes: 1. Parentheses in type number indicate orifice designation, as in 26FA10. 2. For corrosive and low temperature materials, see pages 17 through 21. 3. For open and packed lever materials and test gags, see accessories on pages 68 & 69. 4. For capacities, see pages 39-42 U.S. Units, 57-60 Metric Units. 5. For dimensions and weights, see pages 72-75. 6. Also suitable for liquid service where ASME Code Certification is not required. For ASME Code Certified liquid service, use the 2600L Series as illustrated on page 14. *For 316 Stem Retainer add S1 suffix to Type #.

Bill of Materials–BalanSeal Item Part Name Material 26( )B10 SA-216 GR. WCB thru 26( )B16 Carbon Steel 1 Body 26( )B32 SA-217 GR. WC6, Alloy St. thru 26( )B36 (11⁄4 CR–1⁄2 Moly) 26( )B10 SA-216 GR. WCB thru 26( )B16 Carbon Steel 2 Bonnet 26( )B32 SA-217 GR. WC6, Alloy St. thru 26( )B36 (11⁄4 CR–1⁄2 Moly) 3 Cap. Plain Screwed Carbon Steel 4 Disc 316 St. St. 5 Nozzle 316 St. St. 6 Disc Holder 316 St. St. 7 Blow Down Ring 316 St. St. 8 Sleeve Guide 316 St. St. 9 Stem 316 St. St. 10 Spring Adjusting Screw Stainless Steel 11 Jam Nut (Spr. Adj. Screw) 316 St. St. 12 Lock Screw (B.D.R.) 316 St. St. 13 Lock Screw Stud 316 St. St. 14 Stem Retainer 17-4-PH St. St. 15 Bellows Inconel Composite 16 Bellows Gasket Non-Asbestos Carbon St., Rust proofed or 17 Spring Button 316 St. St ASME SA-193 18 Body Stud GR. B7 Alloy St. ASME SA-194 19 Hex Nut (Body) GR. 2H Alloy St. 26( )B16 Chrome Alloy 20 Spring thru 26( )B26 Rust Proofed 26( )B32 High Temperature Alloy thru 26( )B36 Rust Proofed 21 Cap Gasket 316 St. St. 22 Body Gasket 316 St. St. 23 Bonnet Gasket 316 St. St. 24 Lock Screw Gasket 316 St. St. 25 Hex Nut (B.D.R.L.S.) Stainless Steel 26 Lock Screw (D.H.) Stainless Steel 27 Pipe Plug (Body) SteelGeneral Notes:1. Parentheses in type number indicate orifice designation, as in 26FB10.2. For corrosive and low temperature materials, see pages 17 through 21.3. For open and packed lever materials and test gags, see accessories on pages 68 & 69.4. For capacities, see pages 39-42 U.S. Units, 57-60 Metric Units.5. For dimensions and weights, see pages 72-75.6. Also suitable for liquid service where ASME Code Certification is not required. For ASME Code Certified liquid service, use the 2600L Series as illustrated on page 14.

The 2600L Series liquid relief valves are for use on ASMEBuilt in Section VIII Code applications and offer a superior valveconformance to with greater capacity at 10% overpressure than theASME Code traditional 2600 Series.Section VIII,capacity certifiedby National Board The 2600L Series complements a full line of pressure relief valves in orifices “D” through “T” to meet the ASME Code requirements for incompressible fluid services. The Code stamped construction requires liquid relief valves that have been capacity certified on water at 10% overpressure to carry the ASME UV and National Board NB symbols.

For compressible fluid services, the standard 2600 Series should be used. Liquid service applications that do not require the use of Code stamped liquid relief valves can still be satisfied with the standard 2600 series line. In most cases the standard 2600 should only be used in liquid service where an existing installation pipe size / orifice combination does not match the 2600L design.

The 2600L Series is also