DESCRIPTIONDeluge Valve is known as a system control valve ina deluge system, used for fast application of waterin a spray system. Deluge valve protects areas suchas power transformer installation, storage tank,conveyor protection and other industrial applicationetc. With the addition of foaming agent deluge valvecan be used to protect aircraft hanger andinflammable liquid fire.
VALVE OPERATION Fig 502 is a quick release, hydraulically
operated diaphragm valve. It has three chambers,isolated from each other by the diaphragm operatedclapper and seat seal. While in SET position, waterpressure is transmitted through an external bypasscheck valve and restriction orifice from the systemsupply side to the top chamber, so that supplypressure in the top chamber act across thediaphragm operated clapper which holds the seatagainst the inlet supply pressure because of thedifferential pressure design.On detection of fire thetop chamber is vented to atmosphere through the
TECHNICAL DATA
MODEL Fig 502-Ductile Iron ASTM A536-77 GRADE 65-45-12
FLANGE CONNECTION ANSI B 16.5 #150 FF(RF-Optional)
WET PILOT SPRINKLER As per graph in theHEIGHT LIMITATION catalogue
NET WEIGHT 200 NB - 153 KgWITHOUT TRIM 150 NB - 79 Kg
100 NB - 50 Kg 80 NB - 35 Kg 50 NB - 32 Kg
FINISH RAL 3000
APPROVAL UL Listed
ORDERING 1. Size of valveINFORMATION 2. Flange specification
3. Valve trim vertical or horizontal4. Trim type
outlet port via opened actuation devices. The topchamber pressure cannot be replenished throughthe restricted inlet port, and the upward force ofthe supply pressure lifts the clapper allowing thewater flow to the system piping network and alarmdevices.
TRIM DESCRIPTIONThe trims are functionally termed as Dry Pilot Trim,Wet Pilot Trim, Electric Trim and Test and AlarmTrim as per the mehod of actuation of the delugevalve.
The functionality of these trims is described below..
a) DRY PILOT TRIM (PNEUMATIC RELEASE) Dry pilot operation uses a pilot line of closed
Sprinkles/QB detectors containing air underpressure, located in the areato be protected. Itrequires regulated dry air supply with main supplypoint through restricted orifice. The air pressureto bemaintained as specified in the catalogue ofDry Pilot Actuator. The pilot line is connected toair inlet side of actuator. The top chamber of thedeluge valve is connected to water inlet side ofactuator.
When there is an air pressure drop, or due torelease of any of the release device on detectionof fire, the diaphragm of actuator is lifted andallows the water to drain. This releases the waterpressure in the top chamber of the deluge valve,allowing the deluge valve to open and water toflow into the system piping & alarm devices.Recommended air supply pressure for dry pilottrim system is 3.5 kg/sq.cm.
User must install non return valve at air supplyconnection to deluge valve trim.
Fig 502 Deluge Valve
Issue A
Rapidrop GlobalRutland Business Park, Newark Road, Peterborough, PE1 5WA, United Kingdom
In dry pilot trim, an actuator (DPA) is provided.An optional Pneumatic Reset Device (PRD) canbe provided, which acts as a manual reset devicein the dry pilot line.
b) WET PILOT TRIM (HYDRAULIC RELEASE) Wet pilot operation uses a pilot line of closed
Sprinklers/QB detectors containing pressurizedwater, supplied through the upstream side of theDeluge valve, through a restricted orifice. All therelease lines are connected to a common releaseline. Due to release of any one of the releasedevice, the water pressure in the top chamberof the Deluge valve drops and the Deluge valveopens.
c) ELECTRIC RELEASE TRIM To actuate a Deluge valve electrically, a solenoid
valve is provided to drain the water from thetop chamber of the Deluge valve. A pressureswitch is provided to activate an electric alarm,to shut down the desired equipment or to give"Tripped" indication of the Deluge valve. In additionto this a pressure switch can also monitor "Lowair pressure" and "Fire condition" when used indry pilot air line.
d) TEST AND ALARM TRIMThis trim is supplied with a test valve is providedto test thenormal operation of the sprinkleralarm bell. The sprinkler alarmcan be suppliedadditionally, which bells on actuation of the Delugevalve.
e) DRAIN AND DRIP TRIM This consists of main and system drain valve in
addition with drip valve.
TRIM TYPESThe trims are designated as follwing.
W =Wet Pilot trim. D = Dry Pilot Trim
a) Type ET-W and ET-D This type of trim is basic trim required to operate
the deluge valve. A solenoid valve for electricremote actuation and pressure switch forsensing & announciation are optional.
b) Type ETW-D and ETD-D This trim type is a combination of components
of the ET trim along with the drip and drain trim.A solenoid valve for electric remote actuationand pressure switch for sensing & announciationare optional.
c) Type ETW-T and ETD-TThis trim type is a combination of components ofthe ET trims along with the test and alarm trim.In dry pilot trim, an actuator DPA-H1 is providedwith optional Pneumatic Reset Device (PRD-1).A solenoid valve for electric remote actuationand pressure switch for sensing & announciationare optional.
d) Type NT-W and NT-D This trim type is a combination of components
of the ET trim along with the test and alarm trimas well as the drip and drain trim. A solenoid valvefor electric remote actuation and pressureswitch for sensing & announciation are optional.
RESETTING PROCEDURE FOR THEDELUGE VALVE(i) Close the upstream side stop valve provided
below the deluge valve
ii) Open both the drain valves/ drain plugs and closewhen the flow of water has ceased
(iii) Close the release device/replace the Sprinklerif release was through Sprinkler/QB Detector
iv) Inspect and release if required, or close thesection of the detection system subjected to"Fire condition"
(v) In case of dry pilot detection system, open theair supply valve to build-up air pressure. Openthe priming valve fully. Open the upstream sideof the stop valve provided below the Delugevalve. No water should flow into the system
vi) Where priming shut off valve is provided forresetting, in addition to above steps press theknob on actuator while resetting
CAUTION(a) Do not close the priming valve, downstream
and upstream stop valves, while the system isin service
(b) The releasing device must be maintained in theopen position, when actuated, to prevent thedeluge valve from closure if anti shut off valveis not provided
(c) While using a Deluge valve in the wet pilotsystem the height and the length of the wetpilot detection line is to be limited as shown inthe wet pilot sprinkler height limitation graph
(d) Do not connect the Sprinkler Alarm outlet drainline to close a common drain as it may createback pressure and Sprinkler Alarm may notfunction
(e) Deluge valve must have support to absorbsudden opening or closing vibration shock tothe piping
(f) To avoid water damage, take precautions whenopening the water supply main control valve,since water will flow from all open system valves
(g) The responsibility of maintenance of theprotection system and devices in properoperating condition lies with the owner of thesystem
SYSTEM TESTING PROCEDURE(i) Keep the upstream side of the stop valve
partially open. To avoid water flow to systemside close the system side stop valve. This valveis to be kept in open position after the testingis completed
(ii) Let any of the release devices to trip. This willresult in a sudden drop of water pressure inthe deluge valve top chamber which in turn will
open the deluge valve. Close the upstream sidestop valve immediately
(iii) Reset the valve as per the procedure givenunder heading "RESETTING PROCEDURE FORTHE DELUGE VALVE"
INSPECTION AND MAINTENANCEInstalled system piping network must be flushedproperly before placing the Deluge valve in service.
A qualified and trained person must commission thesystem. After few initial successful tests, anauthorized person must be trained to performinspection and testing of the system. It isrecommended to have regular inspection and testrun of the system as per NFPA guideline or inaccordance to the organisation having localjurisdiction.
(i) WARNINGInspection and testing is to be carried out onlyby authorised and trained personnel. DO NOTTURN OFF the water supply or close any valveto make repair(s) or test the valve, withoutplacing a roving fire patrol in the area coveredby the system. Also inform the local securitypersonnel and central alarm station, so thatthere is no false alarm signal.
It is recommended to carry out physicalinspection of the system at least twice in aweek. The inspection should verify that all thecontrol valves are in proper position as per thesystem requirement and that there are nodamages to any component.
The frequency of inspections must be increasedin the presence of contaminated water supplies,corrosive/ scaling water supplies, and corrosiveatmospheres.
(ii) NORMAL CONDITION(a) All main valves are open and are sealed
with tamper proof seal
(b) Drain valves must be kept closed
(c) No leak or drip is detected from the dripvalve
(d) All the gauges except the system sidewater pressure gauge, should show therequired pressure
(e) There should be no leakage in the system
(iii) NORMAL CONDITION TEST(a) The system should be checked for normal
condition at least once in a week
(b) Test the sprinkler alarm bell or electricalarm by turning the alarm test valve tothe test position. The alarm should sound.This test should be carried out at leastonce in a week
(c) Depress the drip valve knob. Significantaccumulation indicates a possible seatleakage
(d) Conduct the water flow test as per theprocedure of system testing at least oncea month
(iv) PERIODIC CHECKConduct the water flow test by actuating few ofthe release devices provided in the system. Cleanall strainer(s) and priming line restriction. Thistest is to be carried out at least once in threemonths.
ABNORMAL CONDITION(i) ALARM FAILS TO SOUND
(a) Check for any obstruction in the alarmtest line, make certain that the sprinkleralarm is free to operate
(b) If an electric alarm is provided, check theelectrical circuitry to the alarm
(ii) FALSE TRIPS(a) Check for clogging in priming l ine,
* 2.3 PSI pressure loss @ 15 feet per second (4.57 met/sec) velocity having flow of 594 LPM thru 50 NB DV* 4.7 PSI pressure loss @ 15 feet per second (4.57 met/sec) velocity having flow of 1308 LPM thru 80 NB DV
* 4.7 PSI pressure loss @ 15 feet per second (4.57 met/sec) velocity having flow of 2255 LPM thru 100 NB DV
* 7.5 PSI pressure loss @ 15 feet per second (4.57 met/sec) velocity having flow of 5117 LPM thru 150 NB DV* 8.4 PSI pressure loss @ 15 feet per second (4.57 met/sec) velocity having flow of 8854 LPM thru 50 NB DV
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( * flow at 15 feet per second ( 4.57 meter per second)
Nominal Pressure Loss vs Flow
Fig 502 Deluge Valve
Issue A
Rapidrop GlobalRutland Business Park, Newark Road, Peterborough, PE1 5WA, United Kingdom
NOTICE: The equipment presented in this bulletin is to be installed in accordance with the lasted publication standards of NFPA or other similar organisations also with the provision of government codes or ordinances where applicable. The information provided by us are to the best of our knowledge and belief, and are general guidelines only. Site handling and installation control is beyond our reach. Hence we give no guarantee for result and take no liability for damages, loss or penalties whatsoever, resulting from our suggestion, information, recommendation or damages due to our product. Product development is a continuous programme of Rapidrop and hence the right to modify any specification without prior notice is reserved with the company.
