Specifications

35.
5. Reset detection system — reverse operations performed
in step three above and then proceed according to the di-
rections listed in the “Resetting Model DDX Deluge Valve
Single Interlock Preaction Systems” section of this bulletin
for resetting the Deluge Valve.
Draining Excess/Condensate Water From
System
Refer to Fig. 15
1. Close the main valve controlling water supply to Deluge
Valve. Also close valve A and open main drain valve B.
2. Open condensate drain valve E until all water has drained.
Close valve E. Note: Be sure not to keep valve E open for
an extended period of time because that will cause enough
system air to bleed off thereby causing an undesirable acti-
vation of a trouble-annunciating device.
3. Close main drain valve B. If system contains pressurized
air, allow air pressure to come back up to specification.
Open valve A first, and then open the main valve controlling
the water supply to the Deluge Valve.
Maintenance Procedures - Model DDX Deluge
Valve
Refer to Figs. 7, 8, 13, 14 & 15.
5. Mechanical sprinkler alarm (water motor–not shown)
not operating: This is most likely caused by a clogged
screen in the strainer of the water motor. Proceed as fol-
lows: Remove plug from the strainer. Remove and clean the
screen. Replace the screen and the plug, and then tighten
securely (Ref. Bulletin 613).
6. Leakage out of the ball drip valve G (Fig. 15).
a. Water leakage due to water column in deluge
systems:
This condition can be caused by leakage past the sys-
tem side of the Model DDX Deluge Valve’s seal assembly
(#8, Fig. 13 or #5, Fig. 14). Be sure that this surface is
free of any type of debris. To eliminate leakage due to
water column in a deluge system, refer to the section in
this bulletin marked “Draining Excess/Condensate Water
From System”. If the problem continues proceed to the
following section.
b. Leakage, air or water from the ball drip valve,
G (Fig. 15):
If system air is leaking out the ball drip valve, the problem
is either damage to the airside of the Model DDX Deluge
Valve’s seal assembly (#8, Fig. 13 or #5, Fig. 14), seat
(#29, Fig. 13 or #2, Fig. 14), the upper seat o-ring (#23,
Fig. 13 or #11, Fig. 14) or, on the 8” (200 mm) valve size
only, the mounting ring o-ring (#2, Fig. 13). If supply wa-
ter is leaking out the ball drip valve, the problem could
be caused by damage to the Model DDX Deluge Valve’s
seal assembly (#8, Fig. 13 or #5, Fig. 14), seat (#29, Fig.
13 or #2, Fig. 14), or lower seat O-ring (#24, Fig. 13 or
#11, Fig. 14). The following section provides instructions
to correct both conditions:
A) Shut down the valve controlling the water
supply to the Deluge Valve and open the
1¼” main drain valve on the 2” (50mm), 2½”
(65mm), 76mm and 3” (80mm) valve sizes or
the 2” main drain valve on the 4” (100mm),
165mm, 6” (150mm) and 8” (200mm) valve
sizes, valve B (Fig. 15). Open the water col-
umn drain valve E (Fig. 15). Close the push-
rod chamber supply valve A (Fig. 15) and
open the Model B Manual Emergency Sta-
tion, valve D (Fig. 15).
B) Remove the Deluge Valve’s front (handhold)
cover (#7, Fig. 13 or #4, Fig. 14) and inspect
the seat (#29, Fig. 13 or #2, Fig. 14), clapper
(#6, Fig. 13 or #3, Fig. 14), and seal assem-
bly (#8, Fig. 13 or #5, Fig. 14) for damage. If
inspection indicates damage to the seal as-
sembly (#8, Fig. 13 or #5, Fig. 14), replace
as follows:
For Valve Sizes: 2” (50mm), 2½” (65mm),
76mm, 3” (80mm), 8” (200mm) and 4”
(100mm), 6” (150mm) & 165mm with Screw-In
Seat only, Refer to Fig. 7, Fig. 8 & Fig. 13:
Remove the bumpstop nuts (#10, Fig. 13) and
remove the seal assembly (#8, Fig. 13). Install a
new seal assembly (#8, Fig. 13) and thread the
bumpstop nuts (#10, Fig. 13) onto the threaded
studs of the seal assembly (#8, Fig. 13) and tight-
en finger tight plus ¼ to ½ turn. If inspection in-
dicates damage to the clapper (#6, Fig. 13) only,
then the clapper subassembly can be removed
as follows:
At the rear of the valve, disconnect the water
column drain trim section starting with the el-
bow connector (#22, Fig. 7 or #21, Fig. 8). Then
remove the ¼” globe valve (#33, Fig. 7 or #32,
Fig. 8), followed by the ¾”x¼” reducing bushing
(#53, Fig. 7 or #53, Fig. 8). Remove the retain-
ing ring (condensate drain side for 2” (50mm),
2½” (65mm), 3” (80mm), 76mm and 8” (200mm)
valve sizes or hand hole cover side for 4”
(100mm), 6” (150mm) and 165mm valve sizes)
from the clapper hinge pin (#30, Fig. 13) and
push this pin through the hand hole opening for
2” (50mm), 2½” (65mm), 3” (80mm), 76mm and
8” (200mm) valve sizes or condensate drain side
for 4” (100mm), 6” (150mm) and 165mm valve
sizes and remove the clapper subassembly. Re-
place the seal assembly as described previously.
Inspect the clapper (#6, Fig. 13) visually before
reinstalling. Reinstall in the reverse order making
sure the clapper spacers are in their proper posi-
tion. If the seat (#29, Fig. 13) is damaged or it is
suspected that the leakage is through the lower
O-ring (#24, Fig. 13), the seat-clapper subas-
sembly is easily removed as a unit as follows: