Reliable DDX - Deluge Valve Maintenance and Repair; Deluge Valve Maintenance Procedures; Deluge Valve Repair Procedures

14.
3. Other trim valves — Conrm that the pushrod chamber
supply valve and all pressure gauge valves are open. The
main drain valve, condensate drain valve, and alarm test valve
should be closed.
4. Ball drip valve — Push in on the plunger to be sure ball check
is off its seat. If no water appears, the Deluge Valve water seat
is tight. Inspect the bleed hole on the underside of the pushrod
chamber for leakage.
5. Dry pilot trim — Inspect air pressure for conformance to
Table A.
6. Supervisory Pressure — Conrm that system air pressure
is approximately 7 psi (0.5 bar). Check the pressure mainte-
nance device for leakage and proper pressure.
7. Releasing device — Check outlet of the releasing device
(i.e., the dry pilot line actuator, solenoid valve, or the hydraulic
manual emergency station) for leakage. Also verify that tubing
drain lines from releasing devices are not pinched or crushed
which could prevent proper releasing of the Deluge Valve.
8. Testing alarms — Open the alarm test valve permitting water
from the supply to flow to the electric sprinkler alarm switch
and to the mechanical sprinkler alarm (water motor). After test-
ing, close this valve securely. Push in on the plunger of ball drip
valve until all water has drained from the alarm line.
9. Operation test — Open the Model B Manual Emergency
Station, or alternatively, operate the detection system..
NOTE: AN OPERATIONAL TEST WILL CAUSE THE DELUGE
VALVE TO OPEN AND FLOW WATER INTO THE SPRINKLER
SYSTEM.
10. Secure the Model B Manual Emergency Station in the OFF
position with nylon tie after Deluge Valve is reset.
Testing Detection System Without Operating
Deluge Valve
1. Close the valve controlling water supply to Deluge Valve and
open the main drain.
2. Verify that the pushrod chamber supply valve is open.
3. Operate the wet pilot line, dry pilot line, or electrical detection
system.
4. Operation of the detection system must result in a sudden
drop of water pressure in the pushrod chamber.
5. Reset detection system — reverse operations performed in
step three above and then proceed according to the directions
listed in the “Resetting Model DDX Deluge Valve Single Inter-
lock Preaction Systems” section of this bulletin for resetting the
Deluge Valve.
Draining Excess/Condensate Water From
System
1. Close the main valve controlling water supply to Deluge Valve.
Open the main drain valve.
2. Slightly open the condensate drain valve until all water has
drained. Close the condensate drain valve. Note: Leaving the
condensate drain valve open for an extended period of time
may allow excess air or nitrogen to bleed off resulting in an un-
desirable low pressure supervisory signal.
3. Allow the air or nitrogen pressure to return to the normal level.
4. Slightly open the main valve controlling water supply to the sys-
tem.
5. Slowly close the main drain valve.
6. Fully open the main valve controlling water supply to the
system, and verify that it is properly monitored.
Maintenance Procedures - Model DDX Deluge
Valve
1. Mechanical sprinkler alarm not operating: This is most
likely caused by a clogged screen in the strainer of the water
motor. Proceed as follows: Remove plug from the strainer. Re-
move and clean the screen. Replace the screen and the plug,
and then tighten securely (Ref. Bulletin 613).
2. Water leaking from Ball Drip. This can be caused by either
a water column on top of the clapper or a supply water leak-
age.
a. Leakage due to water column. This condition is caused
by leakage past the clapper seal assembly. Be sure the clap-
per seal and seat are free of any type of debris or damage. If
necessary, follow steps below to replace the seal assembly
and/or seat.
b. Supply water leakage. This condition is caused by
leakage past the lower seat O-ring. Follow steps below for in-
spection and/or replacement of lower seat O-ring.
3. Air or nitrogen leaking from Ball Drip. This condition is
caused by leakage past either the clapper seal assembly or
the upper seat O-ring.
a. Clapper seal leak. Be sure the clapper seal and seat are
free of any type of debris or damage. If necessary, follow steps
below to replace the seal assembly and/or seat.
b. Upper seat O-ring. Follow steps below for inspection
and/or replacement of upper seat O-ring.
Repair Procedures - Model DDX Deluge Valve
The following section provides instructions to correct both condi-
tions:
1. Disable detection system and supervisory pneumatic
supply to system.
2. Shut down the valve controlling the water supply to the
Deluge Valve and open the main drain valve. Open the
condensate drain valve. Close the pushrod chamber
supply valve and open the Model B Manual Emergency
Station.
3. Remove the Deluge Valve front (handhold) cover and
inspect the seat, clapper, and seal assembly for dam-
age. If inspection indicates damage to the seal assem-
bly only, replace as follows:
4. Remove the bumpstop nuts and remove the seal as-
sembly . Install a new seal assembly and thread the
bumpstop nuts onto the threaded studs of the seal as-
sembly. Tighten nger tight plus ¼ to ½ turn.
5. If inspection indicates damage to the clapper, proceed
to step 6.
6. At the rear of the valve, disconnect the condensate
drain trim section starting with the elbow connector.
Then remove the ¼” globe valve, followed by the ¾”x¼”
reducing bushing. Remove the retaining rings from the
clapper hinge pin, push the hinge through the conden-
sate drain opening and remove the clapper subassem-
bly. Install a new clapper subassembly in the reverse or-
der making sure the clapper spacers are in their proper
position.
7. If the seat is damage, or it is suspected that the leakage
is through the seat O-rings, proceed to step 8.