groth product selection guide

Pressure/Vacuum Relief Valves

Pressure Relief Valves

Vacuum Relief Valves

Pilot Operated Relief Valves

Emergency Relief Valves

Flame & Detonation Arresters

Blanket Gas Regulators

a Continental Disc CompanyPRODUCT

SELECTION GUIDE

GROTH CORPORATION

Groth Corporation was estab-lished as Groth EquipmentCorporation in Houston, Texas in1960. In 1971 Groth began manu-facturing pressure/vacuum reliefvalves and flame arresters. Today,Groth is a global leader in manu-facturing pressure/vacuum reliefvalves, flame and detonationarresters, blanket gas regulatorsand other low pressure relief prod-ucts. In September 1999, Grothbecame a part of the ContinentalDisc Corporation family of compa-nies that produce pressure reliefproducts for industrial applications.Continental Disc Corporation isheadquartered in Liberty, Missouri.We constructed a new manfactur-ing facility in Stafford, Texas in 2002.

PRESSURE/VACUUMRELIEF VALVE

The pressure/vacuum relief valveis a protection device mounted ona nozzle opening on the top of afixed roof atmospheric storagetank. Its primary purpose is to pro-tect the tank against rupturing orimploding. Without an opening ora controlled opening, a fixed roofatmospheric tank would ruptureunder increasing pressure causedby pumping liquid into the tank oras a result of vapor pressurechanges caused by severe ther-mal changes. Imploding, or thecollapsing of a tank, occurs duringthe pumping out procedure orthermal changes. As the liquidlevel lowers, the vapor spacepressure is reduced to belowatmospheric pressure. This vacu-um condition must be controlledby allowing atmospheric air to flow

into the tank. In short, the tankneeds to breathe in order to elimi-nate the possibility of rupturing orimploding. Because of its’ primaryfunction, a pressure/vacuum valveis commonly referred to as a“breather valve”.

FLAME/DETONATIONARRESTERS

Flame arresters are fire safetydevices. They prevent flames fromentering a tank and also provideprotection from flashes within atank. They can also be used as anin-line flashback prevention device.

EMERGENCY VALVE

The primary function of the emer-gency relief valve is to provide acontrolled opening on a tank thatwill be large enough to preventrupturing of the tank under severepressure increases caused byproximity to intense fire.

Each of these safety devicesare used on the atmospheric,fixed roof, non-refrigerated, stor-age tank.

FLAME ANDDETONATIONARRESTERS

BLANKET GAS REGULATOR &PILOT OPERATED RELIEF VALVE

PRESSURE VACUUM RELIEF VALVES

OVERVIEW

Groth Corporation, a Continental Disc company, Stafford, TX, USA2

WHY PRESSURE/VACUUMRELIEF VALVES AREREQUIRED

1. Saves money by saving product.2. Protects tank from over or under

pressure when sized properly.3. Protection against fire hazard when

conforming to API standards.4. Minimizes evaporation loss.5. Reduces atmospheric corrosion

of tank.6. Generally in all cases required

by OSHA, EPA, etc.

PRESSURE/VACUUMVALVESSAVE MONEY

Actually, any properly sized openingin the tank’s upper structure protectsthe tank from damage, but utilizing apressure and vacuum valve alsoserves to accomplish other advan-tages. Two of the more importantare: economic savings and fire haz-ard protection. In 1952, AmericanPetroleum Institute developed a for-mula to determine tank evaporativelosses. The API equation was for-mulated after the results of a total of256 individual tests were compiled.Of the 256 tanks tested (1/2 withopen vents and 1/2 withpressure/vacuum valves), only 178were considered valid. The remain-der were eliminated because ofinadequate data, obviously incor-rect test methods, poor tankconditions, or leaky fittings. The APIhas a formula for calculating tankbreathing loss. The principle factorsare: turnovers per year, true vaporpressure of the product, diameter ofthe tank in feet, the average outagein feet, the average daily ambienttemperature change, and the paintfactor. The test was conducted ontanks containing gasoline with pres-sure and vacuum valves set at 1/2

oz. pressure and 1/2 oz. vacuum.API 2521 states that 1/2 oz. is theusual setting.

CALCULATING TANKPRODUCT LOSS

A multiple correlation for tanks 20feet in diameter or larger, basedon model equation, derived fromthe tests on the tanks, yielded inthe case of gasoline:

Where:Ly = the breathing loss in barrels

per year.TPY = turn overs per yearP = the true vapor pressure at

bulk liquid temperature inpounds per square inchabsolute

D = tank diameter in feetH = the average outage in feetT = average daily ambient tem-

perature changeFp = the paint factor

A modification of the above equa-tion was then required whichwould accommodate small-diame-ter tanks.

IN MOST CASES APRESSURE/VACUUMRELIEF VALVE WILL PAYFOR ITSELF BEFORE YOUPAY THE INVOICE

The results of these tests indicatethat the evaporation loss on a tankwith a 55,000 barrel capacitywould be 2,000 barrels per year ifan open vent was installed, andonly 1,382 barrels per year if apressure/vacuum valve was uti-lized, thereby saving 618 barrelsper year, every year. This studyalso coined a new catchword,“Conservation Vent.” So if youhear the term conservation vent,you know that the valve referred tois a pressure/vacuum valve orbreather valve.

If the product in the tank cost $40per barrel, this would be a savingsin one year of $24,720 per tank.Pressure/vacuum relief valvesprovide savings of millions of dol-lars and millions of barrelsof product in a large facility suchas the one illustrated on page 4.Depending on size and materialsof construction, a breathervalve can pay for itself in less thana month.

Breathing loss

Tank Estimated Estimated BBLS/YearDiameter Nominal Losses With Losses Saved Using

in feet Tank Pressure Relief with Pressure Capacity Valve Open Vent Relief Valve

30 5,000 154 235 8142.5 10,000 297 441 14460 20,000 570 825 255

100 55,000 1,382 2,000 618

API’S ESTIMATED BREATHING LOSS TABLE

Pressure/Vacuum Relief Valves

ADVANTAGES

Ly = TPY ( P ).68 D1.73H.51T.50FpC1,000 14.7-P

Groth Corporation, a Continental Disc company, Stafford, TX, USA 3

Ly = TPY ( P ).68 D1.73H.51T.50Fp1,000 14.7-P

An advantage of using a pres-sure/vacuum valve is that thevalve provides fire protection forthe tank. A pressure/vacuum valveis normally closed except whenventing due to pressure or vacuumconditions. An open ventalways has a free passagewaybetween the vapor in the tank andatmosphere. Therefore, a pres-sure/vacuum valve is usuallyclosed allowing the tank vapor toreach true vapor pressure.

Under true vapor pressure, thevapor in the tank is too rich toburn. The tank is also closedoff eliminating a free passagewayfor fire or sparks to ignite thepotentially combustible vapor inthe tank. If the valve has beenactivated by excessive tank pres-sure, the now open valve iscausing a condition where anyvapors escaping are under posi-tive pressure and the fire hazardwill be kept away from the vaporcontent of the tank. If flames are inthe area and the tank is beingemptied, vapors are not escapingand combustion is not likely tooccur even though the tank mayhave a combustible mixture.

1. Closed tank principle. When apressure/vacuum valve isclosed, vapors are not escapingto support combustion.

2. Pressure when open principle.When the valve is open, thevelocity of the relieving vapor isgreater than the flame speed.

3. Over rich principle due to equi-librium being reached in aclosed tank and therefore thevapors are too rich to burn.When emptying or pumpingfrom the tank, oxygen richvapors are susceptible to burn-ing and flame arresters shouldbe installed between the pres-sure/vacuum relief valve andtank nozzle.

4. The vacuum created duringpump out of product will preventfumes from escaping whichnormally does not present afire hazard.

REDUCED CORROSION

An additional reason for usingpressure/vacuum valves, theyhelp reduce overall corrosion inthe plant. Plant corrosionis reduced due to less productescaping from the tank and there-fore less corrosion is producedby escaping vapors. This meansoverall plant maintenanceis reduced thereby saving laborand dollars.

RECOMMENDED ANDREQUIRED

Pressure/vacuum valves are rec-ommended by API 2000 for useon atmospheric storage tanks inwhich oil with a flash point below100° F is stored. OSHA statesthat tanks storing Class 1 liquidsshall be equipped with ventingdevices which shall be normallyclosed except under pressure orvacuum condition.

Generally speaking, the majorityof the regulatory bodies dealingwith tank safety, API, OSHA,NFPA, Insurance Companies etc.require installation of thesedevices on flammable liquidstorage tanks.

Pressure/Vacuum Relief ValvesBASIC FIRE PROTECTION

ADVANTAGES


HOW PRESSURE/VACUUM RELIEF VALVES OPERATE

How does a pressure/vacuum valveoperate? Most atmospheric tanksrequire a venting device that willallow large volumes of vapor toescape under relatively low pres-sures. Usually the allowable setpressure is in inches of water col-umn pressure, both for positive andvacuum conditions. This is becausemost large storage tanks have a rel-atively low maximum allowableworking pressure. These tanks aregenerally large volume welded ves-sels that are built to API 650 stan-dard. In order to accommodatelarge volumes at low set pressures,these valves have ports that aregreater in area than the inlet or noz-zle connection. The low settingrequired necessitates weight loadingthe valve as opposed to spring load-ing. Because of the above, a pres-sure/vacuum valve requires approxi-mately 100% over set pressure inorder to reach full opening of thevalve. However, when deciding on aset pressure, the weight-loadedvalve operation MAWP should be atleast twice the required set pressure

to obtain optimum flow. If theMAWP is less than 100% above therequired set, the valve could be larg-er in size than normally required.The possibility of valve chatter andaccelerated seat and diaphragmwear will exist if less than 20% overpressure is allowed. Simply stated,a pressure/vacuum valve is

not exactly like a high pressuresafety relief valve and should not besized at 10% or 20% over pres-sure. When sizing a pres-sure/vacuum valve, consult themanufacturer flow tables and allowsufficient overset pressure.

SPRING LOADED VALVES

The spring loaded valve is used onhigher pressure tanks (1-15 PSIGsettings). They will protect from overpressure and excessive vacuumwhile reducing tank breathing, there-by saving product.

Spring loaded valves weigh lessthan a weight loaded valve setat 1 psi.

MODEL 1201B

Pressure/Vacuum Valve Operation

ATM

ATMTank Vacuum

Tank Pressure

MODEL 1660A

OPERATION


PILOT OPERATED RELIEF VALVE

The Pilot Operated Relief Valve isdesigned to provide safe, depend-able, and accurate low pressureand/or vacuum protection. Full flowis attained at no more than 10%overpressure. This reduces theneed for high over pressure whichconserves product and reducesfugitive emissions. Blowdownmay be adjusted torequirements between0% and 20% of set pressure. Properlyadjusted the PilotOperated Relief Valve isbubble tight up to 95% ofset pressure. The Pilot OperatedRelief Valve provides the maximum available control technol-ogy as specified in the Clean Air Act of 1990.

SIZING A PRESSURE/VACUUM RELIEF VALVE

API Standards are provided as anengineering aid for specification andselection of “normal” and “emer-gency” pressure and vacuum reliefvalves for aboveground liquid petro-leum storage tanks. Normal ventingcapacity is obtained without exceed-ing pressure or vacuum that wouldcause physical damage or perma-nent deformation to the tank. Thefollowing will help in sizing a pres-sure/vacuum valve:1. Normal Relief: The sum of vapor

replacement resulting from emp-tying or filling and thermalin-breathing or out-breathing.

2. Emergency Relief: Thermal out-breathing from fire exposure.

3. All Tanks: Generally require thesizing of a normal pressure andvacuum relief valve to be sizedand an independent emergencyrelief valve to be sized separately.

4. Flow Curves: These curvesprovide pressure and vacuumcapacity which is requiredfor sizing.

OSHA AND APIREQUIREMENTS

The OSHA requirement for tankprotection published by theDepartment of Labor as part1910.106, revised July 1, 1985,addresses sizing requirements.OSHA suggests sizing shall bein accordance with API 2000,which clearly defines allrequirements.

PRESSURE/VACUUMRELIEF VALVE SETTING

API 2521

“Pressure/vacuum valves on atmos-pheric pressure fixed-roof tanks areusually set at 1/2 oz. per square inchpressure or vacuum. Test data indi-cate that an increase of 1 oz. persquare inch in the pressure set pointover the usual 1/2 oz. per squareinch reduces breathing losses byapproximately 7 percent. However,the test data indicate that each addi-tional increase of 1 oz. per squareinch in pressure set point reducesthe breathing losses in progressivelysmaller increments.”

API 2513

“The pressure and vacuum settingof a breather valve are dictated bythe structural characteristics of thetank and should be within safeoperating limits. A certain amountof pressure and vacuum beyondthis setting is necessary to over-come pressure drop in order toobtain required flow. Proper sizeand settings can best be deter-mined by reference to API Std2000: Venting Atmospheric andLow-Pressure Storage Tanks(1992) and to the manufacturerstank data determined in accor-dance with this publication. Thepressure setting for pres-sure/vacuum valves to be installedon large tanks constructed inaccordance with API 12:Specification for Large WeldedProduction Tanks (1957) usually islimited to 1/2 oz. because roofplates will start to shift when thepressure increases above 1 oz.”

API Standard 2000 for VentingAtmospheric and Low Pressure Storage Tanks

1. TO HOLD LIQUIDLiquid exerts pressure on the sides and base ofthe tank. Pressure=height of liquid.

2. TO BE FILLEDFor liquid to get in, air and vapor must get out. Ifthey can’t, the tank will be pressurized. For airand vapor to be pushed out, the pressure in thetank must be slightly above atmospheric pres-sure. The tank is designed for an internalpressure of 8 in. water gage (WG).

3. TO BE EMPTIEDFor liquid to get out, air must get in. If it can’t, thetank will be underpressured. For air to be suckedin, the pressure in the tank must be slightly belowatmospheric pressure. The tank is designed foran external pressure (or vacuum in the tank)of 2 1/2 in. WG.

STORAGE TANK DESIGN(National Fire Protection Agency)

STANDARDS


FLAME ARRESTER

A flame arrester is a safety deviceinstalled on a nozzle on top of a tankwhen the flash point of the storedproduct is lower than the possibletank temperature. A majority of thetime, a “vent to atmosphere”pressure/vacuum valve is installedon top of the flame arrester. Aflame arrester is also used as in-linesafety device

where combustible gases are trans-ported through low pressure pipelines to actual combustion, as in anincinerator or flare or where com-bustion fumes are vented throughpiping to atmosphere where light-ning can cause a flame. Flamearresters should be designed to stoptank farm fires caused by lightning,sparking, or actual flame in theimmediate tank area, and to preventflashbacks in lines. In orderto accomplish the above, a flamearrester must act as a barrier(stop a flame), a flame holder (con-tain the flame at the barrier), anddissipate heat in order to preventauto ignition on the down side of theflame arrester.

In order to be an effective flame pre-vention device, a flame arrestermust have a quenching or hydraulicdiameter small enough to stop theflame created by the combustiblegas. Each combustible gas has adifferent required hydraulic diameterto stop the flame.

In addition to stopping the flame,an arrester must be able to dissipateheat. Flame element mass ensuresthat hot gases above the autoignition temperature never reachthe downstream side of theflame arrester.

With an in-line installation, structuralintegrity is important to insure safetyif a detonation should occur. Propergasketing to insure an oxygen freeenvironment in the event of a deto-nation is also important. Unless aflame arrester meets or exceeds theabove mentioned design criteria, it isnot a true flame arrester.

DETONATION ARRESTER

A detonation arrester is anothersafety device installed in a pipingsystem. A detonation is defined as aflame front propagating through aflammable gas or vapor at a velocityequal to or greater than the speed ofsound. A detonation arrester shouldbe installed when the source of aflash back is greater than ten pipediameters from the installation of thearrester or when there is a possiblerestriction in the line. GrothDetonation Flame Arresters arebi-directional and can be installed ina vertical or horizontal pipinginstallation. The model 7658A hasbeen successfully tested and USCGapproved as a Type II DetonationFlame Arrester suitable for applica-tions where stationary flames mayrest on the element.

AIR OPERATED RELIEF VALVE

Air operated relief valves are usedto replace weight loaded and pilotoperated valves in severeapplications where polymerizationand crystalization may takeplace and plug as well as corrodethe pilot valve. The pressureswitch coupled with a solenoidvalve and using plant instrumentair instead of corrosive productvapor provides a bubble tight sealin the valve.

MODEL 7658A

MODEL 1520

PRODUCT DETAIL


VAPOR RECOVERY SYSTEM

With the implementation of the Clean Air Act of 1990, most Liquid Product Storage terminals and hydrocarbonprocessing plants must control evaporative hydrocarbon emissions from loading and storage operations. Two typesof recognized technologies are vapor recovery using carbon absorption or vapor combustion. Both systems requirepressure/vacuum valves and flame or detonation arresters to minimize emissions and maximize safety.

EMERGENCY VALVES

Emergency valves are required byAPI on storage tanks in order toprotect the tank against excessivepressure caused by external fireexposure or flashes within thetank. The excessive pressurecaused by an external fire is gen-erally because an adjacent tank ison fire or some other structure inproximity is on fire. Flashesare generally caused by achemical reaction in the tank.Regardless of the cause of theexcessive pressure, an openinglarger than the normal pressure/vacuum valve is necessary in

order to carry off the additionalvolume resulting from the fireexposure the tank is experiencing.API 2000 states emergency vent-ing my be accomplished by theuse of:

1. Larger or additional open vents.2. Larger or additional

pressure/vacuum valves orpressure relief valves.

3. A gage hatch which permits thecover to lift under abnormal internal pressure.

4. A manhole cover which permits the cover to lift underabnormal internal pressure.(ERV Model 2000A/2400A)

5. A connection between the roofand shell which is weaker thanthe weakest vertical joint in theshell or shell to bottom connec-tion (weak roof to shell weld).

MODEL 2000A

TYPICAL VAPOR RECOVERY SYSTEM

PRODUCT DETAIL


GAS BLANKETING

The Groth Blanket Gas Regulatorensures that a constant gas pres-sure is maintained in the vaporspace of a storage tank. Whenliquid is removed from a tank or thetemperature is reduced, a vacuumwould be developed. With the Groth

Blanket Gas Regulator, a blanketgas is supplied to prevent a vacuumfrom developing and to maintain thedesired blanket pressure. In additionto preventing outside air and mois-ture from entering the storage ves-sel, a blanket gas pressure, as lowas 1/2” W.C., reduces the evapora-tion of the stored product to a negli-gible amount. The result notonly conserves product but alsogreatly reduces emissions. Theseadvantages are in addition to the fireprotection that is provided.

CONCLUSIONTank protection equipment is specialized. Understanding this equipmentand how it should be applied will ensure that your storage tank is protectedproperly from any number of potential hazards. Protection fromrupturing or imploding, and protection from fire hazards are the majorconsiderations. Environmental and conservation features enhance the valueof these products.

CAL-Q-SIZE PRODUCT CAPACITY RATINGSPC compatible sizing program for Pressure/Vacuum Valves in accordancewith API 2000. Download from our web site at www. grothcorp.com or con-tact Groth Corporation Sales Department.

CLEAN AIR ACT OF 1990 METHOD 21 LEAK TEST

The 1990 amendment to the 1977 Clean Air Act, requires the emissions ofany of the identified volatile organic compunds (VOCs) be kept to under500 parts per million (PPM). Method 21 is the leak test procedure used toto detect rate of leakage from process equipment, including valves, flanges,pressure relief devices, etc. Groth Corporation Pilot Operated Valves (withthe film seat option) and Blanket Gas Regulators provide pressure and/orvacuum protection for liquid storage tanks while assuring your compliancewith the Clean Air Act.

VAPOR EMISSION REDUCTION


PILOT OPERATED RELIEF VALVES

PRESSURE RELIEF VALVES VACUUM RELIEF VALVES

PRESSURE/VACUUM RELIEF VALVES

Fiberglass Valves

• Most Groth valves can be constructed of fiberglass

Model 1560• Air actuated pressure relief

for extreme service• Pressure relief• High flow capacity• Sizes: 2" through 12"• Pressure settings:

3 oz./in.2 through 15 PSIG

Model 1360 A• Vacuum breaker• Side mount• Modular design• Sizes: 3" through 14"• Vacuum settings:

1/2 oz./in.2 to 12 PSIG

Model 1300 A• Vacuum breaker• Sizes: 2" through 12"• Vacuum settings:


Model 1200 A• Pressure/Vacuum

Relief Valve• Sizes: 2" through 12"• Pressure settings:

1/2 oz./in.2 to 15 PSIG• Vacuum settings:


Model 1220 A• Pressure/Vacuum Relief Valve• Pipe-away feature• Sizes: 2" through 12"• Pressure settings:

1/2 oz./in.2 to 15 PSIG• Vacuum settings:


Model 1260 A• Pressure Relief Valve• Pipe-away feature• Sizes: 2" through 12"• Pressure settings:


Model 2300A• Pressure Relief Valve• Sizes: 2" through 12"• Pressure settings:


Model 1420• Pressure/Vacuum Relief Valve• Pressure & vacuum relief• High flow capacity• Sizes: 2" through 12"• Pressure settings:

3 oz./in.2 through 15 PSIG• Vacuum settings:


Model 1660A• Pressure Relief Valve• High flow capacity• Sizes: 2" through 12"• Pressure settings:

2" W.C. through 15 PSIG

Available in aluminum (type 356), carbon steel, stainless steel, fiberglass, and other materials, in most models.

Model 2500• Emergency Relief Valve• Sizes: 18" and 24"• Pressure settings:

8 oz./in.2 to 15 PSIG

Model 1220 A / 7618• Pressure/Vacuum Relief

Valve and Flame Arrester w/Pipe-Away Feature


BLANKET GAS REGULATOR FLAME TRAP ASSEMBLIES

FLAME AND DETONATION ARRESTERS

EMERGENCY RELIEF VALVES

Model 7618ª Flame arrester

(vertical design)• FM approved• Sizes: 2" through 60"• Available with weather hood.

Model 7628• Flame arrester

(horizontal design)• FM approved• Sizes: 2" through 30"

Model 7658 A• Detonation arrester

(horizontal design)• Coast Guard approved• Sizes: 2" through 24"

Model 7622• Flame check• Sizes: 1/2" through 1-1/2"

Model 2301A• Pressure Relief Valve• Sizes: 2" through 12"• Pressure settings:


Model 2000A• Emergency relief

manhole cover• Sizes: 16", 20" and 24"• Pressure settings:

1-1/2 oz./in.2 to 16 oz./in.2• Also available with

vacuum breaker.

Model 2450A• Emergency relief manhole

cover with hinged cover withvacuum breaker

• Sizes: 20" through 24"• Vacuum settings:

1/2 oz./in.2 to 4 oz./in.2• Pressure settings:

2 oz./in.2 to 8 OZ./in.2• Also available pressure only.

Model 2100• High pressure emergency

relief valve• Sizes: 16", 20" and 24"• Pressure settings:

1 PSIG to 15 PSIG

Model 8500A• Flame Trap Assembly• Sizes: 2" through 12"

Model 8400A• Back Pressure Regulator and

Flame Trap Assembly• Sizes: 2" through 12"

Model 3011 L/H• Blanket Gas Regulator.• Setting from 0.5” W.C.

to 8” W.C. • Consult factory for

higher settings and vacuum applications.

,Groth Corporation, a Continental Disc company, Stafford, TX, USA 11

STEAM JACKETED PRODUCTS ADDITIONAL PRODUCTS

Model 6000 Series• Gauge hatch.• Sizes: 4" through 10".

Model 8110• Back Pressure Check Valve• Sizes 2" through 12"

Groth is committed to the totalquality improvement process.

Visit us at our website:www.grothcorp.com

Groth E-mail address: [email protected]

GROTH CORPORATION13650 N. Promenade Blvd.

Stafford, Texas 77477tel 281-295-6800 • fax 281-295-6999

800-354-7684

CDC Corporate Headquarters Germany The Netherlands United KingdomContinental Disc Corporation Continental Disc Deutschland GmbH Continental Disc Corporation Continental Disc UK Ltd.3160 West Heartland Drive Postfach 1310 PO Box 172 Unit C, The Business CentreLiberty, Missouri 64068-3385 D-41337 Korschenbroich 2394 ZH Hazerswoude-Rijndijk Faringdon Avenue, Harold Hill, Romford816-792-1500 tel Germany The Netherlands Essex RM3 8EN816-792-2277 fax (0) 2161-642021 tel (0) 71-5412221 tel United Kingdomwww.contdisc.com (0) 2161-64766 fax (0) 71-5414361 fax (0) 1708-386444 tel

[email protected] email [email protected] email (0) 1708-386486 [email protected] email

Most Groth valves and flame arresterscan be steam jacketed.

Groth Corporation, a Continental Disc company, Stafford, TX, USA 92880 Rev. A, ProdSelGuide.qxd, 5m, 4/02 ©Copyright 2002 Groth Corporation12

TEST STANDS

Pressure/Vacuum Relief Valve Test Stand• Provides convenient, accurate testing and setting of

P/V valves or high pressure relief valves. Includes leak testing.

groth product selection guide

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