Instruction manual

14.
Maintenance Procedures - Model DDX
Deluge Valve
Refer to Figs. 2, 5, & 6.
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 follows: Re-
move plug from the strainer. Remove and clean the
screen. Replace the screen and the plug, and then
tighten securely (Ref. Bulletin 613).
Leakage out of the ball drip valve E (Fig. 6).
Water leakage due to a water column above
the Deluge Valve’s clapper:
This condition can be caused by leakage past
the system side of the Model DDX Deluge Valve’s
seal faceplate subassembly (#5, Fig. 5). Be sure
that this surface is free of any type of debris. To
eliminate leakage due to a water column, refer
to the section in this bulletin marked “Draining
Excess/Condensate Water From System”. If the
problem continues proceed to the following sec-
tion.
Leakage, air or water from the ball drip valve,
E (Fig. 6):
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 faceplate subas-
sembly (#5, Fig. 5), seat (#2, Fig. 5), or the upper
seat O-ring (#11, Fig. 5).
If supply water is leaking out the ball drip valve
the problem could be caused by damage to the
Model DDX Deluge Valve’s seal faceplate sub-
assembly (#5, Fig. 5), seat (#2, Fig. 5), or lower
seat O-ring (#11, Fig. 5). The following section
provides instructions to correct both conditions:
Shut down the valve controlling the water
supply to the Deluge Valve and open the
main drain valve B (Fig. 6). Open the wa-
ter column drain valve H (Fig. 6). Close the
push rod chamber supply valve A (Fig. 6)
and open the Model B Manual Emergency
Station D (Fig. 6).
Remove the Deluge Valve’s front (handhold)
cover (#4, Fig. 5) and inspect the seat (#2,
Fig. 5), clapper (#3, Fig. 5), and seal face-
plate subassembly (#5, Fig. 5) for damage.
If inspection indicates damage to the clapper
(#3, Fig. 5) or seal faceplate subassembly (#5,
Fig. 5) 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 (#14, Fig. 2). Then remove the ¼”
globe valve (#62, Fig. 2), followed by the ¾” x
¼” reducing bushing (#23, Fig.2). Remove the
retaining ring (handhold cover side) from the
clapper hinge pin (#14, Fig. 5) and push this pin
1.
2.
a.
b.
A.
B.
through the water column drain line and remove
the clapper subassembly. Remove the four re-
taining screws (#24, Fig. 5) holding the seal
faceplate subassembly (#5, Fig. 5). Inspect the
clapper (#3, Fig. 5) visually before re-installing.
Apply a small amount of silicone-based lubri-
cant to the four retaining screws. Install a new
seal faceplate subassembly. Torque the retain-
ing screws to approximately 40 inch-pounds and
reassemble. If the seat (#2, Fig. 5) is damaged
or it is suspected that the leakage is through the
lower O-ring (#11, Fig. 5), the seat-clapper sub-
assembly is easily removed as a unit as follows:
Using a 5/16” Allen wrench, remove the two 3/8”
NPT pipe plugs (#19 (not shown) Fig. 5) located
on the side of the Model DDX Deluge Valve. The
seat-clapper subassembly is retained by two
locking pins (#17 (not shown) Fig. 5). The cen-
ters of these pins have a ¼”-20 threaded hole.
Remove the two locking pins by engaging them
with a ¼”-20 screw or threaded rod and pulling
them out (The two locking pins are not threaded,
so turning them with the attached ¼”-20 screw
or threaded rod is not recommended. A proven
method is to use ¼”-20 threaded rod with a lock-
nut on the unassembled end. Grab hold of the
locknut with pliers or vice-grips and tap the pli-
ers or vice-grips in the direction away from the
Deluge Valve. Doing so should pull the locking
pins out of the Deluge Valve.). With the clapper
(#2, Fig. 5) in the closed position (not latched),
dislodge the seat-clapper subassembly from the
Valve’s body by inserting two slotted screwdriv-
ers under the lever and clapper mounting ears
and pry up until the seat-clapper subassembly is
free of its bore. Reach into the valve and grasp
the seat-clapper subassembly from the sides.
Lift up and rotate the seat-clapper subassembly
through 90 degrees about the centerline axis of
the Model DDX Deluge Valve so that the lever
side of the seat-clapper subassembly faces the
outlet of the Deluge Valve. Rotate the seat-clap-
per subassembly around the centerline of the
Deluge Valve until the top of the clapper faces
the handhold opening and then pull it out clapper
hinge-pin side first. Visually examine all compo-
nents of the seat-clapper subassembly replacing
any component that appears damaged. New O-
rings (#11, Fig. 5) should always be used for re-
assembly.
Reassembly:
It is likely that the lower seat O-ring (#11, Fig. 5)
has remained at the bottom of the Deluge Valve
body’s bore. Discard this O-ring and clean the
bore. Lubricate the bore with O-ring grease and