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AF Dry Pipe Valve

2 Figure 1 Dry Pipe Valve Section Note: The Clapper Assembly may be removed from the body of the Dry Pipe Valve by removing the two 3/8" plugs (#6) and removing the ...




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Text of AF Dry Pipe Valve

Flange x Flange - AFAFManufactured by: Central Sprinkler Company451 North Cannon Avenue, Lansdale, Pennsylvania 194467-96ProductDescriptionThe Central Dry Pipe Valve is a drypipe sprinkler system water-supplycontrol valve that makes possible theinstallation of sprinkler systems inbuildings subject to freezingtemperatures. It is designed so thatair pressure in the piping system willhold back water pressure at the valveuntil such time as a sprinkler isactivated. Upon such activation theair pressure in the system will bedecreased sufficiently to causeautomatic operation of the valve andadmission of water into the is a 5:1 differential type valvehaving a clapper air seat of largediameter relative to the water two concentric seats areseparated by an intermediatechamber normally maintained atatmospheric Dry Pipe Valve Trim packageincludes the necessary valves,gauges, fittings and nipples to providean air supply connection, primingwater connection, drain connections,alarm connection, and alarm testbypass. The Dry Pipe Valves areListed/Approved with Central s substitutions or omissions mayvoid such Listings and Approvals,without prior approval from s Air Maintenance Devicefor owner s air supply or automatic aircompressor supply may be easilyconnected to the Dry Pipe Dry Pipe Valve is available inthe flange-by-flange Valves are Listed by Under-writer s Laboratories, and Approvedby Factory Mutual for use in firesprinkler systems with a maximumworking pressure of 175 Pipe Valve2" & 2 1/2"Dry PipeValve &TrimTechnicalDataModel: AFStyle: Flange-x-FlangeSize: 2" & 2 1/2"Approvals: , , Working Pressure: 175 psiFactory Hydro Test: 100% at 350 psi (with clapper open)Standard Finish: Blue enamelFlange Specifications:AF Inlet - Class 125 ANSI Outlet - Class 125 ANSI Take-Out: 12"Required Accessories:Standard Trim (as shown)Optional Accessories:Air Maintenance DeviceAir CompressorPressure Alarm SwitchWater Motor AlarmLow Air Pressure SwitchMfgr. Source: :Valve - 70 - 38 1Dry Pipe Valve SectionNote: The Clapper Assembly may be removed from the body of the Dry Pipe Valveby removing the two 3/8" plugs (#6) and removing the hinge pin (#5).2Main Drain Connection1 1/4" NPT109174563Air Supply Connection(3/4" NPT)Priming Connection(3/4" NPT)Inter. ChamberConnection(3/4" NPT)4 1/16"12"Flanged Outlet - Model AF2"8 Identification NumberPart NumberNumber RequiredDescription(2" & 2 1/2" Size)11Body (2")200-188-0011Body (2 1/2")200-188-0421Water Seat Ring*200-183-0031Air Seat Ring*200-184-0042Body Bushing300-187-0051Hinge Pin818-10-10062Pipe Plug, 3/8"-18 NPT818-12-00071Clapper Assembly200-186-0081Cover250-02-00091Cov er Gasket250-04-000104Cover Bolt 3/4"-10 x 2" Long600-03-000Parts List - Dry Pipe ValveModel AF (2" Part No. 2210), (2 1/2" Part No. 2212)*Not field 2Dry Pipe Valve Clapper Assembly89471265LatchBoltRetainingPlateR ubberSealClapperLatchSpringClapperBushin gClapperBushingLatchPinRetainingRing103I dentification NumberPart NumberNumber RequiredDescription(2" & 2 1/2" Size)11Clapper200-182-00 22Clapper Bushing (thru body)818-08-00031Rubber Seal200-180-00 41Retaining Plate200-181-00 541/4"-20 x 5/8" Hex Head Bolts300-16-000 62Clapper Bushing (thru latch)818-08-00071Latch300-10-000 81Latch Pin300-23-000 92Retaining Ring300-22-000101Latch Spring300-21-000Parts List - Clapper AssemblyModel AF (2" & 2 1/2" Assembly No. 200-186-000)4OperationWhen the Dry Pipe Valve is in theset position, the rubber-faced clapperis tightly closed on two concentricseat rings. The inner ring is the waterring and the outer ring is the air annular space between the twoseat rings (intermediate chamber) isopen to the atmosphere via the alarmconnection trim piping to the normallyopen automatic ball drip water is provided above theclapper up to the level of the primingconnection. Above the priming water,compressed air (or nitrogen) ismaintained at a pressure sufficient tohold the clapper closed. The DryPipe Valve has a differential trip ratioof approximately 5 to 1. Thus thevalve will open (trip) when the airpressure in the system piping isreduced to approximately one-fifth ofthe water supply purpose of the priming water isto assist in providing a positive seal atthe air seat ring to prevent air fromescaping into the intermediatechamber and on to the clapper will remain in the closedposition as long as the air pressure inthe piping system is maintained at theproper a sprinkler operates, the airpressure in the piping system decaysdue to the air escaping from theopened sprinkler. When the airpressure has decayed to the pointthat it is no longer adequate to holdthe clapper shut, the water supplypressure lifts the clapper whichautomatically latches in the openposition. Water flows into the systempiping to the open sprinkler(s). At thesame time, water flows via theintermediate chamber into the alarmconnection trim piping (closing theautomatic ball drip valve) andcontinues on through the alarm line tooperate the pressure actuated alarmswitch and/or the water motor a sprinkler opens, theresulting air pressure decay isinversely proportional to the volumeof air in the sprinkler accordance with current NFPA13, the maximum allowable capacityof a single dry pipe system isnormally 750 gallons. The capacitymay exceed 750 gallons only if watercan be delivered to the inspector stest connection in 60 seconds or CompressorThe compressed air supply for thedry pipe system is usually providedby a continuously available,electrically driven, air compressorwhich is automatically controlled toturn on and off at the designedminimum and maximum pressures,respectively. After initialpressurization of the system, the airsupply is maintained through an in-line, 1/8" orifice in the piping of the AirMaintenance Device. The orifice issmall enough that when a sprinkleropens, the air supply will not interferewith the operation of the Dry PipeValve by rapidly supplying additionalair pressure to the upper chamber ofthe Dry Pipe air compressor must beadequately sized to be able to bringthe system air pressure up to thedesign level in 30 minutes or required size of the aircompressor in , may bedetermined from the = X System Capacity(gallons), where is the free airdelivery in cubic feet per minutebased on standard air at sea level. Capacity ( )Diameter (in.)Sch. 40Sch. 10 3 1 1 1 " wall pipe2 " wall pipe3 Schedule 30 pipeDESIGN CONSIDERATIONSGeneralThe Central Model AF Dry PipeValves must be installed in thevertical position. They should belocated in a sprinklered area notsubject to freezing conditions, suchas a well-lighted and heated valvehouse or similar enclosure havingsufficient room to enable ease ofinstallation, care and properly installed, the Trimon the Dry Pipe Valve protrudes thefollowing horizontal distances fromthe center line ( ) of the riser: Trim2" & 2 1/2"Protrusion* to left 11 1/2" to right 15" to rear 11 1/2"* When the observer is facingthe valve body cover dry pipe system workingdrawings must show:1. The manufacturer, style, modelnumber, and size of the DryPipe The total number of sprinklerson each dry pipe system, and,3. The capacity (gallons) of eachdry pipe sprinklers in dry pipesystems must be of the dry pendenttype in areas that are subject pipe systems that supplyfreezer areas must be equipped witha local, Low Air Pressure Alarm whichmay be connected to the system riserjust above the Dry Pipe Valve. For freezer area systems, a desiccantair dryer should be provided in the airsupply line to remove moisture fromthe compressed System CapacityThe capacity (gallons) of the pipingsystem may be calculated using thefollowing table:5GeneralDry Pipe Valves must be installed in asprinklered area not subject tofreezing conditions, such as a well-lighted and heated valve house orsimilar enclosure having sufficientroom to enable ease of installation,care and to installing the Dry PipeValve in the piping system, the watersupply line must be thoroughlyflushed to assure that no foreignmatter is valve must be installed in thevertical position in the system according to the Trim AssemblyDiagram on page the hand hole cover andgasket and check the valve clapperfor freedom of order to place the Dry Pipe Valveinto operation, the valve must be set (see Setting Procedure). The systemside of the valve clapper assemblymust be primed with water to the levelof the priming : Priming water is as follows:2" & 2 1/2" = 3/4 Gallon The system piping must besubsequently pressurized with air (ornitrogen) via the air connection. Afterpriming and pressurization of the DryPipe Valve, the main system watercontrol valve must be opened initial installation, the alarm test,main drain test and trip test(s) mustbe performed and the system resetand placed in is recommended that Central sAutomatic Air Maintenance Device bepermanently connected to the systemto avoid the possibility of false valvetrips which may result from smallpiping leaks gradually loweringsystem air difficulty in performance isexperienced, Central SprinklerCompany should be contacted if anyfield adjustment is to be ProcedureStep 1. Close the main water supplycontrol valve to the sprinkler system(OS&Y, PIV or other).Step 2. Close all valves in the DryPipe Valve Trim, except the 1/4"three-way valves (Fig. 5, #8) at theAir Pressure Gauge and WaterPressure 3. Open the system main drainvalve, the system inspector s testvalve, and all system auxiliary drainvalves connected to the any sprinklers which mayhave keeping the inspector s testconnection open, the system pipingwill be maintained at atmosphericpressure and the test connection willserve as a vent during systemdrainage and during priming of theDry Pipe 4. After all drainage hasstopped, tightly close all auxiliarydrain valves. Leave the inspector stest valve and system main drainvalve " & 2 1/2"Flow in 200 300 400 500 in LossFor use in hydraulic calculations,the pressure loss through the DryPipe Valve may be expressed asequivalent length of schedule 40,C=120 pipe as follows:2" & 2 1/2" Valve = 23 feetDrainage (per NFPA 13)The dry pipe system must bedesigned so that all portions of thepiping system may be drained. Inorder to assure proper drainage:1. Branch lines, cross and feedmains shall be pitched inaccordance with NFPA 13, Trapped sections of piping mustbe equipped with auxiliary drainsas follows:a. If the trapped section is lessthan 5 gallons capacity,provide a 3/4" valve with plugor with nipple and If the trapped section isgreater than 5 gallonscapacity, provide a drum drip(2" x 12" pipe nipple with a 1"valve on each end) with theoutlet valve equipped with aplug or nipple and 3 - Set PositionFigure 4 - Activated PositionPressureReliefMainSupplyAlarm Line(to Water Gong)Priming DrainCondensate DrainCondensate DrainWaterMainDrainFill PortAlarm TestAir SupplySystemBall DripSystemAirWater LevelPressureReliefFill PortPrimingDrainCondensateDrainMain SupplyMain DrainAlarmTestBallDripAlarm Line(to Water Gong)Air Supply7Figure 5Trim Assembly Diagram - 2" & 2 1/2" Dry Pipe ValveModel AF DetailNumberDescription Quantity 11 1/4" x 2 1/2" Nipple1 21 1/4" x 1 1/4" x 1/2" Tee2 31 1/4" MxF Ball Valve1 41 1/4" x 4" Nipple1 51/2" x 2" Nipple4 61/2" x 1/4" x 1/2" Tee1 71/4" x 6" Nipple1 81/4" 3-way Globe Valve2 91/4" Pipe Plug2101/2" Union1113/4" x 2" Nipple6123/4" Union1133/4" x 1/2" x 3/4" Tee2141/2" x 1 1/2" Nipple4151/2" Ball Drip Valve1163/4" Check Valve2173/4" x 3/4" x 1/2" Tee2183/4" Ball Valve1191/2" 90 Elbow3201/2" x 11 1/2" Nipple1211/2" Ball Valve1DetailNumberDescriptionQuantity223 /4" x 3/4" x 1" Tee1231" Pipe Plug1243/4" x 1/4" Red. " Pipe Plug1263/4" x 3" Nipple2273/4" x 3/4" x 1/4" Tee2281/4" x 2" Nipple1293/4" x Close Nipple4301/2" Relief Valve1313/4" Globe Valve1321/2" Check Valve1331/2" x 5" Nipple1341/2" Drip Cup135 *1/4" Gauge, Air136 *1/4" Gauge, Water1371/4" 90 Street Elbow1381/4" x Close Nipple2391/4" Globe Valve2401 1/4" x Close Nipple1411 1/4" 90 Elbow1Normal Valve Position 3Normally Closed 8Normally Open18Sealed Open21Normally Closed23 (Plug)Normally Screwed Tight31Normally Open39Normally Closed***** Note: Detail trim kit is available without 12. Close the CondensateDrain Valve and replace the PrimingSupply 13. Check the Automatic BallDrip Valve (Fig. 5, #15) for If there is little or no leakage, theclapper is properly with the "SettingProcedure".b. If there is leakage, the clapper isnot properly seated, and thepriming water is leaking past theair seat into the intermediatechamber. The Dry Pipe Valvemust be re-opened andrepaired. Replace the rubberseal on the clapper if it is performing the necessaryrepairs, repeat steps 5 through13 14. Close the systeminspector s test 15. Open the Air SupplyControl Valve (Fig. 5, #31) and admitair to the system. If the system isequipped with an automatic AirMaintenance Device, refer to theappropriate Central Bulletin fordetailed : It is good practice to buildup the air pressure on the systemto 10 psi and then individuallyopen the auxiliary drains to forceany remaining water from the lowpoints in the system. When dry airstarts to discharge, close thevalve(s) tightly and replace theplug or 16. Continue to admit air intothe system until the Air PressureGauge (Fig. 5, #35) registers the airpressure required to hold the DryPipe Valve closed against the watersupply pressure. The recommendedair pressure is a function of the watersupply pressure as follows: Step 5. Remove the valve bodyCover and Gasket (Fig. 1, #8 & #9).Caution: Never attempt toremove the valve cover whilethe valve is under 6. Lift the clapper assembly(Fig. 1, #7) and carefully inspect thewater seat ring (Fig. 1, #2), air seatring (Fig. 1, #3), rubber seal (Fig. 2,#3), and valve body interior. Clean ifnecessary. Do not use cleaningcompounds which could damage therubber seal. Be careful not to scratchor dent the seat rings. Damaged seatrings are not 7. Verify that the clapperassembly moves freely and that thespring-loaded anti-reseat Latch ( , #7) moves freely under hand-applied 8. Raise the rear portion of theanti-reseat Latch so that it clears thetwo cast-in-body latching positions,and lower the clapper assembly tothe closed and fully-seated not force the clapper in attemptingto make the Dry Pipe Valve tight. Donot use grease or other sealingmaterials on the seat rings orrubber 9. Reinstall the valve bodyCover and Gasket, being careful totighten the bolts evenly in 10. Open the Priming SupplyPlug (Fig. 5, #23), while making surethat the Condensate Drain Valve ( , #39) is closed. Prime the Dry PipeValve by slowly pouring water into thePriming Supply. Stop pouring whenwater remains visible in the PrimingSupply : Priming water is as follows:2" & 2 1/2" = 3/4 GallonStep 11. Open the CondensateDrain Valve to remove excesspriming water from the Dry (psi) Water (psi) Min. Max. 5015 25 7525 3510035 4512540 5015040 5017540 50Step 17. Again, check the AutomaticBall Drip Valve for leakage. Thereshould be If there is no leakage, theclapper is properly with the SettingProcedure .b. If there is leakage, the clapperis not properly seated and isnot holding the priming Dry Pipe Valve must bere-opened, inspected, andrepaired or replaced. Priming water must be retained inthe valve before the system can beplaced in service. After correctingany problems, repeat steps 3 18. Slowly open the main watersupply control valve to the sprinklersystem. When water starts todischarge from the main drain, slowlyclose the main drain valve (Fig. 5,#3). Then fully open the main watersupply control valve (O,S&Y, PIV orother).Step 19. Perform a Main Drain Test(see Main Drain Test Procedure).Step 20. Open the Alarm Test Valve(Fig. 5, #21), and then perform anAlarm Test (see Alarm TestProcedure).Step 21. Seal, lock, or otherwisesecure the Alarm Control Valve ( , #18) and the main water supplycontrol valve in the open system is now ready for 22. If alarms connect to acentral station or fire department,notify the signal receiving station thatthe system has been placed to completion of the installa-tion of a Dry Pipe System, the pipingmust be tested for strength and waterleakage (hydrostatic test) and for airleakage (air test). The test resultsmust be recorded on the Contractor sMaterial and Test TestThe 2-hour, 200 psi hydrostatic testof the sprinkler system piping must beconducted with the valve clapperlatched in the open position. Therubber seal on the face of the clappermay be ruptured if the valve is testedwith the clapper in the closed posi-tion. The test should be conductedas weather permits to prevent freez-ing of the TestThe 40 psi air pressure test of thesprinkler system piping must beconducted to verify there are no leaksthat would allow a pressure loss psi or more during the 24-hourtest TestingAfter the installation of a Dry PipeSystem is complete and prior to finalacceptance by the Authority HavingJurisdiction, the installer must con-duct a Main Drain Test, Alarm Test,and Trip Test. The test results mustbe recorded on the Contractor sMaterial and Test Certificate. Refer to the Trim AssemblyDiagram (Figure 5) which correlateswith the numbers noted in thefollowing procedures:Main Drain Test ProcedureThe purpose of the Main Drain Testis to show whether or not the normalwater supply is available to thesystem. By comparing the static andresidual water pressure readings withany previously established readings,a Main Drain Test can indicate thepossible presence of partially closedvalves or other obstructions in thesupply piping. To avoid propertydamage during testing, provisionmust be made for proper disposal ofwater issuing from the test procedure for conducting amain drain test is as follows:Step 1. While the Dry Pipe Valve is set , and the main drain valve isclosed, note and record the readingon the Water Pressure Gauge (Fig. 5,#36). This is the static 2. Open the main drain valve(Fig. 5, #3) slowly until it is wideopen. Verify that a full steady flow ofwater is discharging from the maindrain pipe. If a full steady stream isnot discharging, check the main drainpiping for 3. Allow the water to flow untilthe reading on the Water PressureGauge drops and stabilizes. Thenrecord this reading. This is theresidual 4. Close the main drain 5. Compare static and residualpressure readings with any previouslyestablished or normal readings. If thereadings compare favorably, thewater supply may be consideredsatisfactory. If the readings vary toany great extent, the condition shouldbe investigated to determine thecause. Some possible causes are:a. Partially or totally closed watersupply control Clogged or frozen water Serious leakage at water supplyvalves or Significant modifications to thewater supply system since theprior test. This may be verifiedwith the local water supply utilityor fire Test ProcedureUnlike wet sprinkler systems, it isnot practical to periodically test theoperation of the alarm connected to adry pipe system by opening theinspectors test valve normally locatedat the most remote position of thesystem piping. The reason being thatthe entire dry system piping would fillwith water, hence necessitating time-consuming system draining and alarms connect to a centralstation or fire department, notify thesignal receiving station prior to and atthe completion of the Alarm procedure for testing the alarmwithout tripping the system is asfollows:Step 1. Open the Alarm Test Valve(Fig. 5, #21). This will pressurize thealarm line, cause the pressure alarmswitch (if any) to activate and thewater motor alarm (if any) to 2. Close the Alarm Test Valve(Fig. 5, #21) to silence the Test ProcedureDry Pipe Valves should be triptested during warm weather,preferably in the summer to allow allcondensation to drain from thesystem piping before the onset ofcold proceeding with any trip testof a Dry Pipe Valve, the water supplyline to the system should be thor-oughly flushed. The system maindrain may be used for this purpose. Ifthere is a hydrant on the supply line,it should be used to flush the pipingbefore the main drain is : Assistance is required toperform some of the operations inthis test procedure for conducting afull-flow trip test is as follows:Step 1. While the dry pipe system is in service , open the main drain ( , #3) valve slowly until it is wideopen. Then check to make sure thata full steady flow of water isdischarging from the main drain the water to flow at full pressurelong enough to clear the water supplypipe of any accumulation of scale orforeign 2. Slowly close the main drainvalve. The Dry Pipe Valve is nowready for Trip 3. Note and record the readingson the Air Pressure Gauge and onthe Water Pressure : Before proceeding, beprepared to record the followinginformation; a watch with a sweepsecond hand will be Air Pressure reading when theDry Pipe Valve The time when the inspector stest valve is The elapsed time, in seconds,when the Dry Pipe Valve The elapsed time, in seconds,when water begins flowing fromthe inspector s test 4. While observing the AirPressure Gauge, have the inspector stest valve opened by an assistant andnote the : If two-way communication isnot available, the time of openingthe inspector s test valve may bedetermined by observing when theneedle on the Air Pressure Gaugestarts to move 5. When the Dry Pipe Valvetrips, quickly note the time and thereading on the Air Pressure 6. Allow water to flow into thesystem. Note the time when waterstarts to discharge from theinspector s test 7. Keep the Inspector s TestValve open until clean water isflowing at the connection. Terminatethe test by closing the Inspector sTest Valve and then the main watersupply control valve (O,S&Y, PIV orother).Step 8. Compare the data on trippoint pressure, trip time, and waterdelivery time to the inspector s testconnection, with previous testrecords. If the data differs to anygreat extent from previous records,the cause should be investigated, andthe condition 9. Drain the Dry Pipe System,thoroughly clean the Dry Pipe Valve,replace parts as required, and resetthe valve (see Setting Procedure).Step 10. The Dry Pipe Valve shouldbe provided with an attached tagwhich shows the date when the valvewas tripped and the name of theperson and organization performingthe organization performing thetest should maintain separate recordswhich show the test results including:initial air and water pressures, triptime, trip air pressure, water deliverytime to the inspector s test connectionand operating condition of the DryPipe Valve and accessory may have additionalregulations and requirements formaintenance, testing and inspectionthat must be areas of the Dry Pipe Valveand Trim that should be included insemi-annual inspections are de-scribed Seal(Refer to Figure 2) The rubber seal(#3) should be checked for wear ordamage. It should be free of dirt orother foreign substances. If found tobe worn or damaged, the rubber sealshould be replaced. If it is dirty, itshould be cleaned. Compoundswhich could damage the rubber sealmust not be used. The rubber sealshould be inspected at any time thereis excessive water leakage at theAutomatic Ball Drip Valve (#15, Fig.#5).Clapper Seal Replacement(Refer to Figure 2) The rubber sealmay be replaced by removing theClapper Assembly and removing thefive bolts (#5) holding the RetainingPlate (#4) against the rubber seal andto the clapper (#1).Seat Rings(Refer to Figure 1) The air (#3) andwater (#2) seat rings should becleaned and checked for damagesuch as nicks, scores or dents. Seatrings are not field replaceable. ADry Pipe Valve with damaged seatrings must be replaced. The seatrings should be inspected at any timethere is excessive water leakage atthe Automatic Ball Drip Ball Drip Valve (Refer to Figure 5) The plunger onthe Ball Drip Valve (#15) should bepushed in during inspection to verifythat the ball is free and any slightseepage of water from the intermedi-ate chamber of the Dry Pipe Valvehas escaped. Excessive seepageindicates the rubber seal on the valveclapper should be Central Model AF Dry PipeValves and their accessory devices(air maintenance device, pressurealarm switch, water motor alarm),should be semi-annually examined byexperienced and qualified personnel,to ensure proper operation andtrouble-free : Any systemmaintenance or inspection thatinvolves placing a control valve out-of-service will eliminate thefire protection normally providedby the to proceeding, be certain tosecure permission from all AuthoritiesHaving Jurisdiction and notify allpersonnel who may be affectedduring system shutdown. A fire watchduring maintenance periods is arecommended owner is responsible for theproper operating condition of all fireprotection devices and NFPA Standard 25 entitled, Inspection, Testing and Maintenanceof Water-Based Fire ProtectionSystems , contains guidelines andminimum maintenance , the Authority HavingCare &Maintenance11Gauges(Refer to Figure 5) The air (#35) andwater (#36) pressure gauges shouldbe checked for accuracy. Verify thatthe required air pressure is beingapplied to the system. If the gaugesare damaged or non-operational, theyshould be DevicesThe Air Maintenance Device,Pressure Alarm Switch and WaterMotor Alarm should be inspected andmaintained in accordance with theinstructions in the appropriate CentralBulletin and NFPA PressureAir (or nitrogen) pressure must bemaintained on the dry pipe systemthroughout the year. Dry pipesystems should not be converted towet systems during the warm weatherseason because this will causeincreased corrosion andaccumulation of foreign matter in thepiping. Maximum allowable airpressure leakage is psi per 24hours. If this maximum is exceeded,the leaks should be Water Level(Refer to Figure 5) Loss of primingwater either through evaporation intothe system or by seepage past the airseat ring, could result in operation ofthe Dry Pipe Valve. Conversely,accumulation of additional water fromcondensation in the system couldraise the priming water level up intothe riser and slow the operation of thevalve. Such water columing abovethe clapper may result in valvemalfunctioning and possible freezingof water in the riser. The CondensateDrain Valve (#39) is utilized to checkthe priming water level (see SettingProcedure, steps 10 through 12).The priming water level should bechecked at least placing an order, indicate thefull product name. Please specify thequantity, model number, style Dry Pipe Valve does notinclude trim, air maintenance device,pressure switch or water motor must be ordered Dry Pipe Valves do not includeflange nuts, bolts, and gaskets ormechanical grooved items must be and Service: Centralsprinklers, valves, accessories, andother products are availablethroughout the , Canada, andinternationally, through a network ofCentral Sprinkler sales anddistribution centers. You may writedirectly to Central Sprinkler Companyor call (215) 362-0700 for the centernearest : Patents are table:1 inch = mm1 foot = M1 pound = kg1 foot pound = Nm1 = Kpa= bar= kg/cm21 gallon = dm3= litersConversions are Main Drain Test and Alarm Testshould be performed on a quarterlybasis. A Trip Test should beperformed on an annual the system is placed back inservice after any maintenance, notifyall Authorities Having Jurisdiction,and the personnel who were affectedduring system : Central SprinklerCompany will repair and/or replaceany products found to be defective inmaterial or workmanship within aperiod of one year from the date ofshipment. Please refer to the currentprice list for further details of thewarranty. 1996 Central Sprinkler CompanyPrinted in Sprinkler Company451 N. Cannon Avenue, Lansdale, PA 19446Phone (215) 362-0700FAX (215) 362-5385Bulletin

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