Instruction manual

15.
place the lower seat O-ring on the step at the
bottom of the bore, verifying that it is in full con-
tact with the bore. Lubricate the bottom step and
upper seat O-ring (#11, Fig. 5) of the refurbished
seat-clapper subassembly. Insert the seat-clap-
per subassembly into the handhold opening of
the Deluge Valve lever-first, rotating it until the
lever side faces the outlet of the Deluge Valve.
Rotate the seat-clapper subassembly until the
lever (#7, Fig. 5) faces the push rod (#20, Fig.
5), then drop the seat-clapper subassembly into
the Deluge Valve’s bore. Verify that the seat-
clapper subassembly is in the fully down posi-
tion and check to see that the lever lines up with
the push rod. Adjust if necessary. Clean and
lubricate the two locking pins (#17 (not shown)
Fig. 5) with O-ring lubricant and drive them into
the Deluge Valve body. Then reinstall the 3/8”
NPT pipe plugs (#19 (not shown) Fig. 5). Reas-
semble the handhold cover and set up the Model
DDX Deluge Valve as per the section “Resetting
the Single Interlock Preaction System.”
Leakage out of the push rod chamber vent hole:
A small bleed hole is located on the underside of the
push rod chamber (see Fig. 5). If there is air or water
leakage coming out of this hole, do the following:
a) Shut down the valve controlling water supply to the
Deluge Valve. Relieve the inlet pressure by opening
the main drain valve B (Fig. 6). Close the valve A
(Fig. 6) that supplies water to the push rod chamber,
and open the Model B Manual Emergency Station,
valve D (Fig. 6).
b) Remove the trim at the unions nearest to the push
rod chamber cover (#8, Fig. 5).
c) Take the push rod chamber cover (#8, Fig. 5) off
by removing the six retaining screws (#29, Fig. 5).
CONDITION ONE (Water coming out of the bleed
hole):
Water coming out of the bleed hole is caused by a
leaking diaphragm (#34, Fig. 5). Visually inspect the
push rod chamber cover (#8, Fig. 5) and piston (#18,
Fig. 5) to determine what could have damaged the
diaphragm and correct. Install a new diaphragm.
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 push
rod chamber cover and reassemble the six retaining
screws (#29, Fig. 5) with an installation torque of 15
foot-pounds. Set up the Model DDX Deluge Valve as
per the section “Resetting the Single Interlock Preac-
tion System.”
3.
CONDITION TWO (System Air coming out of the
bleed hole):
System air coming out of the bleed hole is caused by
a defective O-ring assembled to the push rod guide
(#21, Fig. 5). Remove the piston-push rod subassem-
bly, push rod spring (#32, Fig. 5), and push rod guide
(#21, Fig. 5). Verify by hand turning, that the push
rod cannot be unscrewed from the piston. Replace
all O-rings and the push rod guide. The correct in-
stallation torque for the push rod guide is 35 inch-
pounds. CAUTION: Do not over-tighten the push
rod guide. Reassemble the components that were
initially removed. Re-install the diaphragm (#34, Fig.
5) if it appears to be in good shape, otherwise, re-
place 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 push rod chamber cover and reassemble the
six retaining screws (#29, Fig. 5) with an installation
torque of 165 inch-pounds. Set up the Model DDX
Deluge Valve as per the section “Resetting the Single
Interlock Preaction System.”