farris safety valve series 2600 made in china

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.

With Farris, a trustworthy valve is only part of our promise. Farris provides customers with total pressure relief management solutions that support a facility’s entire lifecycle, transforming the way you ensure plant safety:

Using the power of iPRSM technology and our Farris Engineering Services team, correctly design your pressure relief system to respond to every overpressure scenario

Equip your plant with Farris’ full line of spring loaded and pilot operated PRV hardware, knowing your plant is protected by 70 years of manufacturing experience

Now you can accurately size and select a pressure relief valves for any combination of process applications with SizeMaster™ Mark IV pressure relief valve engineering software. This program for Windows® (all versions) brings unprecedented integration of standard engineering practice to the task of sizing and selecting pressure relief valves.

With SizeMaster Mark IV software, you can define as few as one or as many as 64 different sizing scenarios including blocked flow, fire, thermal and tube rupture, from a scenario matrix grid. Selection of the pressure relief valve is automatically based on the relief area of the worst case scenario. Various Wizards make the most complicated task simple; for instance, the Capacity Wizard allows you to determine accurate vapor generation for vessels of all types.

Quicksize Database Tube Rupture Scenario English/Metric Dimensional Drawings API-Omega 2-phase flow calculations Noise and reaction force calculations Multiple valve sizing Standard Windows user interface functions Developed under ISO 9001-2000 guidelines Supports network database access Database administration tools Interactive product catalog Internal client/project database Complete revision control with definable database access English/metric units definable by job level Import/export capabilities Online help including a variety of tutorials

All sizing equations and selection algorithms are based on ASME Code requirements, API standards and best engineering practice as determined by Farris Engineering. The equations and flow algorithms are internally calculated within an innovative worksheet engine. This worksheet engine also checks parameters and any intermediate calculations against standards’ constraints, letting you know about any non-compliance issues it encounters. All equations, calculations and internal algorithms can be displayed on screen or printed for review.

The engineering worksheet engine also checks your parameters and all intermediate calculations against the standards’ constraints, and it tells you about any non-compliance that it encounters, such as attempting to size a conventional valve when a bellows valve is required.

Once SizeMaster calculates the orifice area required to relieve your process scenarios, SizeMaster guides you through the selection of the appropriate Farris pressure relief valve and its materials and other options.

SizeMaster includes catalogue information for Farris 2600, 2700, 3800, 6400, 6600, 4200, 2800 , and 7200 series pressure relief valves, including their black and white drawings. While you are selecting a Farris type number for a tag, SizeMaster ensures that you don’t pick a valve that is not applicable to your process parameters (such as a liquid-service valve for a vapor scenario), and on-line help is available to assist in the determination of each of the digits of the Farris type number, based on your process scenarios.

From its Quick Size and Capacity Wizards through to its consistently standard Windows user interface, SizeMaster makes the job of sizing and selecting pressure relief valves easy, and its worksheet management and workflow auditing facilities let you ensure that your results are correct.

Our type numbering system simplifies the selection and specifying of Farris pressure relief valves because the digits that comprise a specific type number

have a distinct significance. The digits describe the basic valve series, orifice, seat and internal construction, inlet temperature range, body, bonnet and

4. For a valve in complete stainless steel, add “N4” to suffix. Example: 26HB10-120/N4. For optional complete Inconel bellows, add “N4/SP”. Example: 26HB10-120/N4/SP.

1. Standard seat tightness for “O” ring valves is no bubbles at 90% of set pressure for both conventional and bellows valves. At set pressures of 50 psig and below, leakage test shall

1. All valves supplied with plain caps unless otherwise specified. Standard suffix for type number is “-120”. For other cap construction, refer to page 69.

6. Optional equipment includes: air set device for set pressure testing, extra large lapping glass for valve seat maintenance, spring compression device for set

While this information is presented in good faith and believed to be accurate, Farris Engineering, division of Curtiss-Wright Flow Control Corporation, does not guarantee satisfactory

fitness or any other matter with respect to the products, nor as a recommendation to use any product or process in conflict with any patent. Farris Engineering, division of

Since the early 1940s, the Farris Engineering unit of Curtiss-Wright Flow Control has designed and produced a wide range of spring-loaded and pilot-operated pressure relief valves. Used as safety devices, Farris pressure relief safety valves prevent over pressurization of vessels, pipelines, and equipment. Farris manufacturing is a company recognized as a leader in the hydrocarbon processing, refinery, petrochemical, natural gas production/transmission, pharmaceutical, and general processing industries worldwide. Their safety valves and other PRV hardware can be found across the globe – from the U.S. to the U.K. and S. America to China.

A pioneer in the field, the Farris Engineering company created many safety pressure relief products that remain industry standards. Integrating its core hardware technology with the information age, Farris developed computer software to assist customers in the sizing and selection of safety valves for all manner of piping and equipment. A recent reorganization of manufacturing plants and processes maximized production effectiveness to position the business unit at the forefront of the industry, with service and delivery second to none. If you are looking for an effective, high-quality safety valve and engineering expertise for any and all pressure relief management questions – look to the safety valve companies Farris Engineering and North American Machine Works.

Farris 2600 pressure relief valves are designed to function equally well on air, gases and steam or in liquid service, conforms to API 526 standard, have been carefully constructed and tested in accordance with the requirements of the ASME Pressure Vessel Code, Section VIII. Their capacity rating for the applicable fluids is certified by the National Board of Boiler and Pressure Vessel Inspectors. Both conventional and balanced bellow design are available, full nozzle design guarantee a high stable flow coefficient, balanced bellow design provides consistent capacity, set pressure and blow down at elevated backpressure encountered when valves discharge into headers or where other devices produce variable backpressure in the relief manifold system. Nozzle can be removed from body with the blow down ring attached.

The Farris Advantage................................................................................. 2 Cap and Lever Materials.......................................................................... 68

2600 Series Design................................................................................... 3 Test Gag Installations............................................................................... 69

2600 Series Construction.......................................................................... 4 Remoter, Bugproof Vent and Valve Position Indicators.............................. 70

2600 Series Metallurgy............................................................................. 5 Steam Jacketing Methods....................................................................... 71

Definitions................................................................................................. 9 Valve Dimensions and Weights...........................................................72-75

Series 2600L Certified Design................................................................. 14 Sizing Equations and Nomenclature......................................................... 84

Series 2600S Exposed Spring.................................................................. 15 Conventional Valves................................................................................. 84

2600/2600L Balanced Piston Design....................................................... 16 BalanSeal Valves..................................................................................... 85

1.The threaded connection between the valve nozzle and the valve inlet to avoid distortion on the nozzle seating surface.

relief valve to resist these discharge piping strains materially Long radius elbow

the forces resulting from the body and bonnet pressure when the valve is 2.Corrosive Service In Farris pressure relief valves on corrosive service,

into the valve body, or other techniques are used in an attempt to keep the guiding surfaces during valve operation. This reduces the corrosive

huddling chamber or body pressure away from the topside of the disc to effect of the lading fluid on the guiding surfaces and valve spring, so

1.High Temperature In Farris pressure relief valves on high temperature or vapor stream, there is no induced or forced flow in the Farris design

periods than in competitive designs. The Farris design avoids all these difficulties by discharging directly from

The Farris pressure relief valve design incorporates an integral sleeve polished to produce flatness (as measured with optical flats) that deviates

sleeve guide is extended above the top of the guide flange, minimizing the elimination of thermal distortion are integral design features of the valve.

Elimination of Thermal Distortion In a pressure relief valve, especially disc

All Stainless Steel Stem Construction The Farris two-piece design of disc holder and stem r­ etainer features

The Farris pressure relief valve design features an all stainless steel stem. a positive locking device called the disc holder lock screw. Any attempt

surface. This allows complete freedom of action for alignment purposes The Farris pressure relief valve is available as a conventional valve and

while retaining the positive connection of the threads. It also eliminates as a BalanSeal (balanced bellows) valve. The conversion of this valve

sufficiently positive during valve operations and may be inadvertently or removal of the balanced bellows and bellows gasket in the valve, and

left out during maintenance. the coincidental removal or replacement of a pipe plug in the valve bonnet

guide Although the Farris pressure relief valve does not induce circulation of the

5.Drilling of all flanges always straddles the valve center line. no additional temperature compensation. Where the set pressure is above

Valve Trim tested on air. When steam valves are tested on air, compensation shown

Series valves are located on pages 12 and 13. For low temperature and Low set pressure limits are indicated in the following table. These limits

For best performance in process applications, we recommend pressure Code, Section VIII. Accordingly, pressure relief valve requirements for

relief valves be set to open at a minimum of 10% or 25 psig above the such applications are governed by other codes and standards that should

relief valve. Refer to ASME Section VIII Pressure Vessel Code, Appendix M, The sizing equations for compressible fluids provided herein are valid for

Paragraph M-10, Pressure Differentials for Pressure Relief Valves. sonic flow conditions and should not be used to size pressure relief valves

Safety Valve – an automatic pressure relieving device actuated by the Overpressure – a pressure increase over the set pressure of a pressure

static pressure upstream of the valve, and characterized by rapid full relief valve, usually expressed as a percentage of the set pressure.

Relief Valve – an automatic pressure relieving device actuated by the working pressure of the vessel during discharge through the pressure

static pressure upstream of the valve, which opens in proportion to the relief valve, expressed as a percent of that pressure or in pounds per

suitable for use as either a safety or relief valve, depending on the application. pressure relief valve and actual reseating pressure, expressed as a

prevent the further flow of fluid after normal conditions have been restored. Lift – the actual travel of the disc away from closed position when a valve

at which the pressure relief valve is adjusted to open under service Back Pressure – the static pressure existing at the outlet of a pressure

under service conditions. In a relief or safety relief valve in liquid service, Superimposed Back Pressure – the static pressure existing at the outlet

flows from the valve perpendicular to the outlet. is the result of pressure in the discharge system from other sources when

back pressure. It is applicable only when a conventional type safety - Constant Superimposed Back Pressure – back pressure which does

relief valve is being used in service against a constant superimposed not change appreciably under any condition of operation whether the

the inlet static pressure at which the pressure relief valve is adjusted to the outlet of a pressure relief device, which does not remain constant

Our type numbering system simplifies the selection and specifying of Farris pressure relief valves because the digits that comprise a specific type number

have a distinct significance. The digits describe the basic valve series, orifice, seat and internal construction, inlet temperature range, body, bonnet and

4. Inlet and outlet flange class and facing Valves – If an exact replacement valve is required, then the valve type,

6. O-ring seat pressure seal material, if required and material being supplied. If a specific valve is obsolete, a recommen-

9. Allowable overpressure* materials. Specify valve type, size and serial number. If the serial number

10 spring buttons. Specify valve type, size, serial number, set pressure and

temperature service are listed on pages 18-21. Our selection of these corrosion resistant due to frequent valve operation and where parts

not all-inclusive, covers the most frequently used construction materials. internals and the complete valve are available in 316, Monel and Hastelloy

Note that Farris Engineering cannot guarantee valve service life, as offers S3 and S4 trim categories, depending on the degree of sub-zero

NACE International (formerly The National Association of Corrosion The customer must decide whether his application requires a valve in

Engineers) publishes two standards covering the use of equipment in compliance with NACE standards. Farris Engineering is responsible for

MR0103, Standard Material Requirements – Materials Resistant to Sulfide As part of the order requirement, Farris will verify that material hardness

for Use in H2S-Containing Environments in Oil and Gas Production. springs (for conventional and pilot operated valves only) in compliance

constructions. 2600 Series valves constructed of standard carbon steel To specify a valve with materials compliant to NACE specifications, add the

4. For a valve in complete stainless steel, add “N4” to suffix. Example: 26HB10-120/N4. For optional complete Inconel bellows, add “N4/SP”. Example: 26HB10-120/N4/SP.

secondary orifice (huddling chamber), causing the valve to pop fully open. Material Durometer Durometer

higher than normal, causing pressure relief valves to simmer but not fully -20 to 450 101 to 650 75 150 to 450 75

open. This can cause serious misalignment in the valve, and after the -20 to 125 75 75

pressure drops, the valve will very often continue to leak below the 125 to 450 90 90

Frequently operating pressures are too close to valve set pressures. As Ethylene 0 to 125 70 70

reducing the force that affects tightness. The Farris O-ring seat pressure 950 to 750 to

penetrated, causing leakage problems. The Farris O‑ring seat pressure -150 to 450 15 to 100 50 15 to 100 50

Farris O-ring seat pressure seal maintains tightness because the spring -150 to 450 80 80

valve is blowing. This creates leakage problems after the valve closes. 950 to 750 to

The Farris O-ring seat pressure seal absorbs the impact of these particles -20 to 550 90 90

seating surface on the nozzle as the valve closes. This reduces the Neoprene 751 to 751 to

be improved and maintained. • Main valve and pilot control soft good selection is based upon set pressure and

Nozzle icing results from the refrigerant effect of the flowing media when selection on valve set pressure and operating temperature.

a valve relieves. Ice actually forms on the seat, causing leakage. The Farris • Final soft goods selection should be chemically compatible with the process fluid.

Farris Engineering offers a complete line of large orifice, spring-loaded The 2600 Series large orifice valves are offered in both conventional and

safety relief valves for applications requiring flows larger than the standard BalanSeal construction with ASME Class 300 RF flanged inlet by ASME

API “T” orifice. These large orifice valves offer the same superior design, Class 150 RF flanged outlet, and temperature range from -20° to 800° F.

construction, metallurgy, and options as the standard 2600 Series. They are designed and built in accordance with the ASME Boiler and

1. All valves supplied with plain caps unless otherwise specified. Standard suffix for type number is “-120”. For other cap construction, refer to page 69.

6. Optional equipment includes: air set device for set pressure testing, extra large lapping glass for valve seat maintenance, spring compression device for set

Note: The center to face dimension tolerances "B" and "C" are per API Standard 526: + 1/6" for valves up to and including 4" inlet size and + 1/8" over 4" inlet size.

Farris Nozzle Valves Depth of Groove +0.016, -0

VAPORS or GASES – Lbs./hr.: in a safe valve size. Isentropic coefficient n may be used instead

1620 1.013 1760 1.023 1900 1.035 2040 1.048 2180 1.063 2320 1.081 2460 1.101 2600 1.124 2740 1.152 2880 1.187

2600 675 – – – – – – – – – – – – – – – – – – – – 1.00 .96 .93 .90 .88 .85 .84 .82 .80 .79 .77 .76 .75 .74 .73 .72 .71

Viscosity Correction, Chart Sizing Method If BalanSeal valve construction is used and variable back pressure conditions

Series 2700 ASME NB Certified for Air, Steam and Water Pressure Relief Equip

Series 3800 ASME NB Section III, Division 1 Class I, II & III •Worldwide Network of Service Centers with Factory Trained Technicians

94/9/EC (European Pressure Relief Valve Engineering Software for Sizing and Selection

While this information is presented in good faith and believed to be accurate, Farris Engineering, division of Curtiss-Wright Flow Control Corporation, does not guarantee satisfactory

fitness or any other matter with respect to the products, nor as a recommendation to use any product or process in conflict with any patent. Farris Engineering, division of

Introduction This catalog covers Series 2600, 2600S and 2600L pressure relief valves including the latest infor­ ation available to assist m you in the sizing and selection of the proper valves for your application. Farris pressure relief valves have over a half century of proven performance providing auto­ atic and positive m protection against overpressure in thousands of industrial plants and facilities worldwide. Our earned reputation as “the First Line of Safety” is the result of countless Farris innovations combined with progressive engineering, sound design and high quality...

The Farris Advantage 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 complete 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. What is the Farris Advantage? Easy sizing and selection of valves using Farris catalogs and/or SizeMaster™ Sizing and Selection software. A method of specification and...

2600 Series Design Valve Selection This catalog simplifies the sizing and selection of Series 2600 process pressure relief valves. The pressure relief valves are presented here in an easy-to-understand format. Unless otherwise stated, references made to the Code refer specifically to ASME Section VIII, Division 1. Certified Capacity Code Compliance The Series 2600 pressure relief valves have been carefully constructed and tested in accordance with the requirements of the ASME Pressure Vessel Code, Section VIII. Their capacity rating for the applicable fluids is certified by the National...

2600 Series Construction 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. 1. The threaded connection between the valve nozzle and the valve inlet flange is located low in...

2600 Series Metallurgy Integral Sleeve Guide The Farris pressure relief valve design incorporates an integral sleeve guide (Fig 5), assuring continual positive alignment after the part has been manufactured, and including the same high corrosion resistant properties in the guide flange that are present in the sleeve portion of the guide. The sleeve guide is extended above the top of the guide flange, minimizing the possibility of corrosive or other foreign particles washing onto the guiding surfaces when the valve is relieving or when it is “breathing” as a result of atmospheric temperature...

2600 Series Operation All Stainless Steel Stem Construction The Farris pressure relief valve design features an all stainless steel stem. This construction cost-effectively eliminates dangerous sticking due to galvanic corrosion at the upper guiding point in the spring adjusting screw. The careful design of this upper bearing also ensures proper alignment and optimum freedom from galling and erratic popping. Positive Connection of Parts The Farris design incorporates a positive connection between the valve stem and the stem retainer as well as between the disc and disc holder (Fig 7). These...

2600 Series Operation Steam Jacketing for Better Heat Transfer In modern process plants, it is necessary to keep some valves and lines warm at all times to avoid solidification of the lading fluid and to guarantee the safety of equipment. Farris offers a steam jacket (Fig 8) to substantially increase the rate of heat transfer into the valve and, at the same time, simplify the problem of removing or dismantling the valve for maintenance. This design offers a separate two-piece jacket that installs on a standard valve body. See details on page 71. Simple, Accurate Adjustments The single Blow...

Definitions Safety Valve – an automatic pressure relieving device actuated by the static pressure upstream of the valve, and characterized by rapid full opening or pop action. Used for steam, gas or vapor service. Relief Valve – an automatic pressure relieving device actuated by the static pressure upstream of the valve, which opens in proportion to the increase in pressure over the opening pressure. Safety Relief Valve – an automatic pressure actuated relieving device suitable for use as either a safety or relief valve, depending on the application. Pressure Relief Valve – a pressure...

Type Numbering System Our type numbering system simplifies the selection and specifying of Farris pressure relief valves because the digits that comprise a specific type number have a distinct significance. The digits describe the basic valve series, orifice, seat and internal construction, inlet temperature range, body, bonnet and spring material, inlet flange class and Code liquid design. H Designates high pressure versions. Used for “Q”, “R”, “T”, & “U” orifices only. Series Number Orifice Areas Orifice Letter E BalanSeal with auxiliary balancing piston F BalanSeal with auxiliary...

The highly adaptable 1900 Series Safety Relief Valve with the Eductor Tube Advantage is designed to meet a wide range of industrial applications and is certified for gas, liquid and steam media in conventional and balanced bellows designs. The 1900 Series design flexibility and parts interchangeability accommodate process changes through easy conversion to a variety of designs.