ALARM VALVE - NAFFCO FZCO

ALARM VALVEMODEL: SDH-AVATECHNICAL DATA :NOMINAL SIZE200, 150, 100, & 80 NBEND CONNECTIONFlange X FlangeFlange X GrooveGroove X GrooveMAXIMUMWORKING PRESSURE17.5 Bar (250 PSI)*THREADED OPENINGBSPTMOUNTINGVerticalFLANGE CONNECTIONANSI B16.42 #150(Flange drilling mtachingto ANSI B 16.5 #150)to open, allowing continuous flow of water into thesystem and transmittal of alarm, both electrical andmechanical.TRIMGalvanlsed fitting withBrass ValvesFACTORY HYDROSTATICTEST PRESSURE35 Kg./ Sq.cm. (500PSI)FRICTIONAL LOSS INTERMS OF EQUIVALENTLENGTH OF PIPE (C-120)200 NB150 NB100 NB80 NBFINISHRed RAL 3000ORDERINGINFORMATIONSpecify Size of valve, FlangeConnection, Trim Details andPipe ODREFERENCENFPA 13 and NFPA 257.5 Mtrs.7 Mtrs.6.1 Mtrs.4.7 Mtrs.* For 200 NB FM Approval is rated upto 200PSI (14 Bar)DESCRIPTIONAlarm Valve is a double seated clapper check valve with groovedseat design, which ensures positive water flow for alarm operationand is designed for installation in wet pipe sprinkler system.External bypass prevents false alarm under all supply pressurecondition. In the event of variable pressure condition, false alarmis prevented with the provision of retard chamber, thus the designallows for installation under both variable and constant supplypressure condition.Operation of one or more automatic fire sprinklers causes thewater to flow into the sprinkler system causing the alarm valvewww.shieldglobal.comOPERATIONThe fire protection system initially when beingpressurized, will allow water to flow into the systemuntil the water supply and system pressure isequalized and the clapper closes the waterway.Once the pressure is stabilized, the fire protectionsystem is ready to be placed in service and then thealarm control valve must be opened. Under normalcondition, the water pressure gauge connectedto the system side of the alarm valve would showa higher or equal pressure reading than the waterpressure gauge connected to the supply side ofthe valve. This occurs because of the bypass lineconnecting downstreamand upstream side of the alarm valve, which allowswater pressure surge to pass without lifting the valveclapper off its seat, thereby causing excessive highpressure surge entrapped in the system side due topresence of a check valve, which generally preventsfalse alarm.Sudden high pressure surge, as might beencountered by the start-up of a large fire pump maylead the valve clapper to lift momentarily, allowingwater to flow through grooves in the valve seat tothe retardchamber. The water in the alarm line is automaticallydrained out, which helps to prevent false alarm dueto successive transient surge in supply pressure.Restriction assembly located beneath the retardchamber consists of inlet and drain restrictionorifices, which are established by considering thevolume of the retard chamber to meet the listingand approval requirement with regard to time-toalarm. These requirements represent a balancing ofthe need to reduce the possible false alarm due toa transient surge in supply pressure and to achievedesired minimum time- to- alarm following a sprinkleroperation.49

In constant pressure installation, the retard chamber is notrequired and the water passing through the groove in thealarm valve seat flows directly through restriction nozzleassembly to activate the mechanical and electrical alarm.INSTALLATION1. SHIELD Sprinkler alarm valve, Model-SDH-AVA mustbe installed vertically.2. The alarm valve must be installed in a readily visible andaccessible location and provision to be made in such away that alarm line drain is visible and accessible.3. Where water pressure fluctuates, the variable pressuretrim with retard chamber must be used. Under nonfluctuating water pressure condition, the constantpressure trim, which does not include retard chamber,may be used.4. The valve must be installed with trim in accordancewith the trim data. Failure to follow the appropriate trimconnection guidelines may prevent the device fromfunctioning properly as well as void listing, approval andthe manufacturer’s warranty.5. Care must be exercised while installing the check valvein the trim to ascertain that they are located with the arrowmark on the check valve body and pointed in properdirection.6. The contraction and expansion associated withan excessive volume of trapped air could cause thewaterway clapper to cycle open and shut. This may resultin false alarm or an intermittent alarm. To avoid these, it isrecommended to have breather valve in the system pipingnetwork and a vent valve at the extreme end of the systemto bleed-off the air.7. The ball valve provided on the alarm line must be keptopen and strapped in set position.8. Pipe connecting the retard chamber and sprinkler alarmbell must be supported properly to avoid loading on theretard chamber.9. All the newly installed system pipes must be flushedproperly before alarm valve is put into service.INSPECTION AND MAINTENANCEA qualified and trained person must commission thesystem. After few initial successful tests an authorisedperson must be trained to perform inspection and testingof the system.It is recommended to carry out physical inspection of thesystem at least twice a week. The inspection should verifythat all the control valves are in proper position as perthe requirement of the system and no damage has takenplace to any component.It is recommended that the alarm valve and its accessoriesshould be examined and performed for following at least50quarterly or as demanded by local authorities to ensurereliable and trouble free operation and service.1. Inspection and testing is to be carried out only by anauthorized person. DO NOT TURN OFF the water supplyvalve to undertake repair work or to test the valve, withoutplacing a roving fire patrol in the area covered by thesystem. The patrol should continue until the system is backinto service. Also do inform the local security personnel andalarm control station, so that a false alarm is not signaled.2. Open the alarm test valve. Verify that the sprinkleralarm bell and/or the pressure alarm switch/ electric alarmproperly actuate. Close the alarm test valve and verify thatwater has ceased to flow from the alarm line drain.3. Clean the 20 NB (3/4”) strainer provided on the sprinkleralarm bell line.4. Clean the strainer of restriction assembly.5. Inspect the check valve clapper located on the bypassline.FALSE ALARM1. Inspect the valve rubber clapper face. If worn ordamaged, replace it. Be certain that dirt, stone or any otherforeign object have not accumulated under the clapper faceand lodged in the groove or holes. Clean the clapper facethoroughly. If the seat ring surface is nicked or scoured,it might be possible to repair the same using lappingcompound. If not, replace the complete valve or return it tothe manufacturer’s works for repair.2. If sprinkler alarm bell is not functioning or the impeller isjammed, please follow the maintenance guideline providedin the catalogue for sprinkler alarm bell.3. If pressure alarm switch gives a steady signal, but sprinkleralarm generates an intermittent alarm, check sprinkler alarmbell shaft. If both the sprinkler alarm bell and pressure alarmswitch are generating intermittent alarm then check for thepossible air which is trapped within the sprinkler system.Trapped air is to be bled off. Also the intermittent alarmmay occur due to sudden pressure drop and increase in thesystem. These problems can be corrected by maintaining asteady supply.CAUTION1. The UL Listing, FM Approval and manufacturer’s warrantyare valid only when the alarm valve is installed with trim setand installed as per installation guidelines.2. Pressure relief valve is required with wet pipe system, whena rise in ambient temperature can cause system pressureto exceed 17.5 Bar (250 PSI). A 17.7 Bar relief valve settingshould be used.3. For proper operation of the wet system and to minimizeunwanted false alarm, it is important to remove trapped airfrom the system. The air trapped in the system may alsocause intermittent operation of the Water Motor Alarm duringsustained flow of water.www.shieldglobal.com

WEIGHT IN KGGROOVE PIPE SIZEValve SizeFlange xFlangeFlange xGrooveGroove xGrooveNormal SizePipe OD in MM80 NB89200655444100 NB114.31504235.828150 NB165.11002722.117.3150 NB168.380181512.1200 NB219.1Note: For 150 NB standard supply is 168.3 mm OD pipe Groove. For165.1mm specify in order.NOMINAL PRESSURE LOSS VS FLOWwww.shieldglobal.com51

ALARM VALVE, MODEL – SDH-AVA12FLANGE X GROOVE11731136GROOVE X GROOVE9591248FLANGE X FLANGE131110PART LISTPART B80NBMATERIALSPECIFICATIONHousing (Flange xFlange)1111Ductile IronAV8014Housing (Flange xGroove)1111Ductile IronAV1015AV8015Housing (Groove xGroove)1111Ductile apper Bush2222Brass4AV2004AV1504AV1004AV8004Hex. Head Bolt4111Stainless Steel5AV2005AV1505AV1005AV8005Rubber Clamp1111Stainless Steel6AV2006AV1506AV1006AV8006Rubber Seat1111Neoprene Rubber7AV2007AV1507AV1007AV8007Clapper1111Ductile Iron8AV2008AV1508AV1008AV8008Hinge Pin1111Stainless Steel9AV2009AV1509AV1009AV8009Body Bush2222Brass10AV2010AV1510AV1010AV8010Hex. Head Bolt6644Steel11AV2011AV1511AV1011AV8011Sq. Head Plug2222Forged Steel12AV2012AV1512AV1012AV8012Cover Gasket1111Neoprene Rubber13AV2013AV1513AV1013AV8013Cover1111Ductile IronNA: Parts replacement not available52www.shieldglobal.com

CONSTANT PRESSURE TRIM FOR ALARM VALVEGROOVE X GROOVEFLANGE X GROOVE171725NO141618151615 NO142413DFLANGE X 229451027981,2832671,2861932620NotesDDOptional TrimDrainTo suit at site by installerNormally OpenNormally ClosedWhen pressure switch is supplied thenSl.No. 22 plug not required.www.shieldglobal.com53

CONSTANT PRESSURE TRIM FOR ALARM VALVEITEMNO.CODENO.DESCRIPTIONSIZEQTY200NB 150 NB 100 NB 80 NB1AV01Hex Nipple ”44522AV02Tee ”33323AV03/1Elbow ”222---3AV03/2Elbow½”---------24AV04/1Pipe Nipple ” X 150 mm Long1---------4AV04/2Pipe Nipple ” X 130 mm Long---1------4AV04/3Pipe Nipple ” X 100 mm Long------1---4AV04/4Pipe Nipple½” X 100 mm Long---------11------------1------5AV05/1Pipe Nipple ” X 100 mm Long5AV05/2Pipe Nipple ” X 80 mm Long6AV06/1Pipe Nipple½” X 100 mm Long1------16AV06/2Pipe Nipple½” X 80 mm Long---11---7AV07/1Union ”111---7AV07/2Union½”---------18AV08/1Swing Check Valve ”111---8AV08/2Swing Check Valve½”---------19AV09/1Pipe Nipple ” X 70 mm Long11------9AV09/2Pipe Nipple ” X 60 mm Long------1---9AV09/3Pipe Nipple½” X 70 mm Long---------110AV10Ball Valve½”222211AV11Reducing Hex Nipple ” X ½”---------112AV12Reducing Hex Nipple ” X ¼”111113AV13Reducing Hex Nipple½” X ¼”111114AV14Ball Valve¼”222215AV15Hex Nipple¼”222216AV16Elbow¼”2222Pressure Gauge¼”2222Alarm Test Line Assembly½”---------117AV1718AV18/118AV18/2Alarm Test Line Assembly½”------1---18AV18/3Alarm Test Line Assembly½”---1------18AV18/4Alarm Test Line Assembly½”1---------19AV19Reducing Bush ” X ½”222120AV20Restriction Nozzle Assembly---111121AV21Y Type Strainer ”1111Plug½”1111Sprinkler Alarm---111122AV2223AV23/123AV23/2Sprinkler Alarm---111124AV24/1Hex Nipple2”111---24AV24/2Hex Nipple1¼”---------125AV25/1Angle Valve2”25AV25/2Angle Valve1¼”111------------126AV26Pipe Nipple½” X 60 mm Long222227AV27Pipe Nipple ” X 80 mm Long111128AV28Hex e Switch (Optional)½”54www.shieldglobal.com

VARIABLE PRESSURE TRIM FOR ALARM VALVEFLANGE X GROOVEGROOVE X #2828NO3132 #229984510DD241319##15 NO14FLANGE X nal TrimDrainTo suit at site by installerNormally OpenNormally ClosedWhen pressure switch is supplied thenSl.No. 22 plug not required.www.shieldglobal.com55