Description
Deluge Valve is known as a system control valve in a deluge system, used for fast application of water in a spray system. Deluge valve protects areas such as power transformer installation, storage tank, conveyor protection and other industrial application etc. With the addition of foaming agent, deluge valve can be used to protect aircraft hanger and inflammable liquid fire.
VALVE OPERATION
HD Deluge Valve is a quick release, hydraulically operated diaphragm valve. It has three chambers, isolated from each other by the diaphragm operated
clapper and seat seal. While in SET position, water pressure is transmitted through an external bypass check valve and restriction orifice from the system
supply side to the top chamber, so that supply pressure in the top chamber act across the diaphragm operated clapper which holds the seat against the
inlet supply pressure, because of the differential pressure design. On detection of fire, the top chamber is vented to atmosphere through the outlet port via opened actuation devices. The top chamber pressure cannot be replenished through the restricted inlet port, and the upward force of the supply pressure lifts the clapper allowing the water flow to the system piping network and alarm devices.
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TRIM DESCRIPTION
The trims are functionally termed as Dry Pilot Trim, Wet Pilot Trim, Electric Trim and Test & Alarm Trim as per the method of actuation of the deluge valve. The functionality of these trims are described below: a) DRY PILOT TRIM (PNEUMATIC RELEASE) Dry pilot operation uses a pilot line of closed
Sprinklers/ QB Detectors containing air under pressure, located in the area to be protected. It requires regulated dry air supply with main
supply point through restricted orifice. The air pressure to be maintained as specified in the catalogue of Dry Pilot Actuator (HD 252). The
pilot line is connected to air inlet side of actuator. The top chamber of the deluge valve is connected to water inlet side of actuator.
When there is an air pressure drop, or due to release of any of the releasing device on detection of fire, the diaphragm of actuator is lifted and
allows the water to drain. This releases the water pressure in the top chamber of the deluge valve, allowing the deluge valve to open and water to
flow into the system piping & alarm devices. Recommended air supply pressure for dry pilot trim system is 3.5 kg/sq.cm.
User must install non return valve at air supply connection to deluge valve trim. In dry pilot trim, an actuator (DPA) is provided. An optional Pneumatic Reset Device (PRD) can be provided, which acts as a manual reset device in the dry pilot line. b) WET PILOT TRIM (HYDRAULIC RELEASE)
Wet pilot operation uses a pilot line of closed Sprinklers/QB Detectors containing pressurized water, supplied through the upstream side of
the Deluge valve, through a restricted orifice. Due to release of any one of the releasing device, the water pressure in the top chamber of the Deluge
valve drops and the Deluge valve opens.
c) ELECTRIC RELEASE TRIM
To actuate a Deluge valve electrically, a solenoid valve is provided to drain the water from the top chamber of the Deluge valve. A pressure switch is
provided to activate an electric alarm, to shut down the desired equipment or to give “Tripped” indication of the Deluge valve. In addition to this a
pressure switch can also monitor “Low air pressure” and “Fire condition” when used in dry pilot air line.
d) TEST AND ALARM TRIM
This trim is supplied with a test valve provided to test the normal operation of the sprinkler alarm bell. The sprinkler alarm can be supplied additionally,
which bells on actuation of the Deluge valve. e) DRAIN AND DRIP TRIM This consists of main and system drain valve in addition with drip valve.
TRIM MODEL NO. TRIM DESCRIPTION MOUNTING SCHEMATIC
NO.
ET-W Basic Wet Pilot Trim Vertical Schematic 1
ET-D Basic Dry Pilot Trim Vertical Schematic 2
ETW-T Basic Wet Pilot Trim with Test & Alarm Trim Vertical Schematic 3
ETD-T Basic Dry Pilot Trim with Test & Alarm Trim Vertical Schematic 4
ETW-D Basic Wet Pilot Trim with Drip & Drain Trim Vertical Schematic 5
ETD-D Basic Dry Pilot Trim with Drip & Drain Trim Vertical Schematic 6
NT-W Basic Wet Pilot Trim with Test & Alarm Trim and Drip & Drain Trim Vertical Schematic 7
NT-D Basic Dry Pilot Trim with Test & Alarm Trim and Drip & Drain Trim Vertical Schematic 8
ET-W Basic Wet Pilot Trim Horizontal Schematic 9
ET-D Basic Dry Pilot Trim Horizontal Schematic 10
ETW-T Basic Wet Pilot Trim with Test & Alarm Trim Horizontal Schematic 11
ETD-T Basic Dry Pilot Trim with Test & Alarm Trim Horizontal Schematic 12
ETW-D Basic Wet Pilot Trim with Drip & Drain Trim Horizontal Schematic 13
ETD-D Basic Dry Pilot Trim with Drip & Drain Trim Horizontal Schematic 14
NT-W Basic Wet Pilot Trim with Test & Alarm Trim and Drip & Drain Trim Horizontal Schematic 15
NT-D Basic Dry Pilot Trim with Test & Alarm Trim and Drip & Drain Trim Horizontal Schematic 16
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TRIM TYPES
The trims are designated as following: 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 electric remote actuation and pressure switch for sensing & annunciation 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 actuation
and pressure switch for sensing & annunciation are optional.
c) Type ETW-T and ETD-T
This trim type is a combination of components oF the ET trims along with the test & alarm trim. A solenoid valve for electric remote actuation
and pressure switch for sensing & annunciation are 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 trim as well as the drip and drain trim. A solenoid valve for electric remote actuation and pressure swi tch
for sensing & annunciation are optional.
RESETTING PROCEDURE
A. When priming connection is below the upstream valve (Stop Valve)
(i) Close the upstream side stop valve provided below the deluge valve to cease the flow of water.
(ii) Open both the drain valves/ drain plugs and close when the flow of water has ceased.
(iii) Close the release device/replace the Sprinkler if release was through Sprinkler/ QB Detector.
(iv) Inspect and restore/ replace/ repair if required, the section of the detection system subjected to
“Fire condition”.
(v) In case of dry pilot detection system, open the air supply valve to build-up air pressure. Open the
priming valve fully. When top chamber pressure is more than 50% of the inlet pressure, open the
upstream side of the stop valve provided below the Deluge valve. No water should flow into the
system.
(vi) When priming shut off valve (optional) is provided for resetting, then the water need to be drained
from upstream side of valve.
B. When priming connection is from the inlet of Deluge Valve (Auto resetting)
(i) The deluge valve will reset automatically when releasing devices which were responsible for
deluge valve opening are closed or restored back to their original status (i.e closing of ERS
or replacing the damaged Sprinkler if release was through Sprinkler/ QB Detector or closing
of Solenoid valve). The reset time may be long or cause vibration while closing depending upon the
system back pressure at the outlet of the valve.
CAUTION
(a) Do not close the priming valve, downstream and upstream stop valves, while system is in service
(b) The releasing device must be maintained in the open position, when actuated, to prevent the
deluge valve from closure if anti shut off valve is not provided
(c) While using a deluge valve in the wet pilot system the height and the length of the wet pilot
detection line is to be limited as shown in the wet pilot sprinkler height limitation graph
(d) Do not connect the Sprinkler Alarm outlet drain line to close a common drain as it may create
back pressure & Sprinkler Alarm may not function
(e) Deluge valve must have support to absorb sudden opening or closing vibration shock to the piping
(f) To avoid water damage, take precautions when opening the water supply main control valve, since
water will flow from all open system valves (g) The responsibility of maintenance of the protection system and devices in proper operating condition lies with the owner of the system.
(h) Deluge Valve & its trim shall be maintained at a minimum temperature of 4o
C. Heat tracing is not permitted.
(i) Deluge Valve must be used in pressurised system.
SYSTEM TESTING PROCEDURE
(i) Keep the upstream side of the stop valve partially open. To avoid water flow to system side, close the system side stop valve. This valve is to be kept in
open position after the testing is completed.
(ii) Let any of the release devices to trip. This will result in a sudden drop of water pressure in the deluge valve top chamber which in turn will
open the deluge valve. Close the upstream side stop valve immediately.
(iii) Reset the valve as per the procedure given
under heading “RESETTING PROCEDURE FOR THE
DELUGE VALVE”
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INSPECTION AND MAINTENANCE
Installed system piping network must be flushed
properly before placing the Deluge valve in service.
A qualified and trained person must commission
the system. After few initial successful tests,
an authorized person must be trained to perform
inspection and testing of the system. It is
recommended to have regular inspection and test run
of the system as per NFPA guideline or in accordance
to the organisation having local jurisdiction.
(i) WARNING
Inspection and testing is to be carried out only by
authorised and trained personnel. DO NOT TURN
OFF the water supply or close any valve to make
repair(s), or test the valve without placing a
roving fire patrol in the area covered by the
system. Also inform the local security personnel
and central alarm station, so that there is no
false alarm signal.
It is recommended to carry out physical inspection
of the system at least twice in a week. The
inspection should verify that all the control valves
are in proper position as per the system
requirement and that there are no damages to
any component.
The frequency of inspections must be increased
in the presence of contaminated water supplies,
corrosive/scaling water supplies, and corrosive
atmospheres.
(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 drip valve
(d) All the gauges except the system side water
pressure gauge, should show the required
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 electric alarm
by turning the alarm test valve to the test
position. The alarm should sound. This test should
be carried out at least once in a week
(c) Depress the drip valve knob. Significant
accumulation indicates a possible seat leakage
(d) Conduct the water flow test as per the system
testing procedure at least once a month
(iv) PERIODIC CHECK
Conduct the water flow test by actuating few of
the release devices provided in the system. Clean
all strainer(s) and line restriction nipple. This
test is to be carried out at least once in three
months.
ABNORMAL CONDITION
(i) ALARM FAILS TO SOUND
(a) Check for any obstruction in the alarm test
line, make certain that the sprinkler alarm is free
to operate
(b) If an electric alarm is provided, check the
electrical circuitry to the alarm
(ii) FALSE TRIPS
(a) Check for clogging in priming line, restriction
orifice check valve, priming valve & strainer
(b) Leakage in the release system
(c) The deluge air line restriction orifice clogged or
low supply pressure
(iii) LEAKAGE THROUGH THE DELUGE VALVE
(a) Damaged deluge valve seat or obstruction on
the seat face by foreign object
(b) Leakage in release system
(c) Partly clogged priming line restriction orifice
check valve
(d) Low air pressure on release system line or
leakage in release system
NOTE:
(1) UL Listing is valid only when Deluge Valve is
installed with trim set as per trim drawing.
(2) The trip time of deluge valve on-off device through
detection network, will depend on volume of
detection network. If the trip time of deluge valve
is more, then it can be substantially reduced by
installing check valve in branch of release line in
the detection network. The check valve flow shall
be towards releasing device.
(3) The pneumatic system must have restricted
orifice at air or gas supply point. The restriction
nozzle are supplied with HD dry pilot actuation
trim.
(4) UL Listing is valid only when Listed Solenoid Valve
provided for electric operation of the deluge valve
is retained in the trim. If any other solenoid valve
is used, the deluge valve trip time may be quite
high or deluge valve may not trip.
(5) The Pressure Gauges standard supply is 300 psi
for water gauge for system pressure upto 175
psi. If system pressure is more than 175 psi, then order for 600 psi water pressure gauges
