8. Using Reliable P/N 6881603000 Seat Wrench for 2”
(50mm), 2½” (65mm), 76mm and 3” (80mm) valve
sizes, Reliable P/N 6881604000 for 4” (100mm) valve
size, Reliable P/N 6881606000 for the 6” (150mm) and
165mm valve sizes or Reliable P/N 6881608000 Seat
Wrench for 8” (200mm) valve size, remove the seat by
unscrewing. This will loosen the seat-clapper-mounting
ring subassembly. Reach into the valve and grasp the
seat and remove it from the valve. Then remove the
clapper-mounting ring subassembly from the valve.
Visually examine all components of the seat-clapper-
mounting ring subassembly replacing any component
that appears damaged. New O-rings should always be
used for reassembly.
9. Reassembly: clean the bore of the valve body. Lubricate
the bore with O-ring grease. Lubricate and install the O-rings
onto the seat. Lubricate and install the mounting ring O-ring
into the body (8” (200mm) valve size only). Insert the clapper-
mounting ring subassembly into the handhold opening of the
Deluge Valve using caution to not damage or dislodge the
mounting ring O-ring (8” (200mm) valve size only). Align the
mounting ring so that the Lever is near the pushrod and the
mounting ring “ears” are between the tabs of the valve body.
Insert the seat into the valve body and through the clapper-
mounting ring subassembly. Start to tread the seat into the
body by hand, then tighten the seat with the seat wrench until
it bottoms out on the mounting ring. Verify that the seat-clap-
per-mounting ring subassembly is in the fully down position
between the tabs of the body, and check to see that the lever
lines up with the pushrod. Reassemble the handhold cover
and set up the Model DDX Deluge Valve as per the section
“Resetting Model DDX Deluge Valve Single Interlock Preac-
tion Systems”.
Pushrod Chamber Maintenance -
Model DDX Deluge Valve
A small bleed hole is located on the underside of the pushrod cham-
ber. If there is air or water leakage coming out of the bleed hole:
a) Disable detection system and supervisory pneu-
matic supply to system.
b) Shut down the valve controlling water supply to the
Deluge Valve. Relieve the inlet pressure by opening
the main drain valve. Close the valve that supplies
water to the pushrod chamber, and open the Model
B Manual Emergency Station.
c) Remove the trim at the unions nearest to the push-
rod chamber cover.
d) Take the pushrod chamber cover off by removing
the six retaining screws.
CONDITION ONE (Water coming out of the bleed hole):
Water coming out of the bleed hole is caused by a leaking dia-
phragm. Visually inspect the pushrod chamber cover and piston
to determine what could have damaged the diaphragm and then
correct. Install a new diaphragm. NOTE: The diaphragm has two
different surfaces; it is not bi-directional. It will fail if installed back-
wards! Roll the diaphragm so that the smooth surface (the pres-
sure side) conforms to the inside of the pushrod chamber cover
and the fabric side engages the pushrod, and reassemble the six
retaining screws with an installation torque of 15 foot-pounds in a
star pattern. Set up the Model DDX Deluge Valve as per the sec-
tion “Resetting Model DDX Deluge Valve Single Interlock Preac-
tion Systems”.
CONDITION TWO (System Air coming out of the bleed
hole):
System air coming out of the bleed hole is caused by a defec-
tive O-ring assembled to the pushrod guide. Remove the piston-
pushrod subassembly, pushrod spring, and pushrod guide. Verify
by hand turning, that the pushrod cannot be unscrewed from the
piston. Replace all O-rings and the pushrod guide. The correct
installation torque for the pushrod guide is 35 inch-pounds. CAU-
TION: Do not over tighten the pushrod guide. Reassemble the
components that were initially removed. Re-install the diaphragm
if it appears to be in good shape, otherwise, replace it also. NOTE:
The diaphragm has two different surfaces; it is not bi-directional.
It will fail if installed backwards! Roll the diaphragm so that the
smooth surface (the pressure side) conforms to the inside of the
pushrod chamber cover and the fabric side engages the pushrod,
and reassemble the six retaining screws with an installation torque
of 15 foot-pounds in a star pattern. Set up the Model DDX Del-
uge Valve as per the section “Resetting Model DDX Deluge Valve
Single Interlock Preaction Systems”.
15.
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