Specifications

37.
tabs of the body, and check to see that the lever
(#15, Fig. 13) lines up with the push rod (#25, Fig.
13). Loosen and reassemble if necessary. Reas-
semble the handhold cover (#7, Fig. 13) and set
up the Model DDX Deluge Valve as per the sec-
tion “Resetting Model DDX Deluge Valve Single
Interlock Preaction Systems”.
For Valve Sizes: 4” (100mm), 165mm, 6”
(150mm) with Drop-In Seat Confi guration
only, Refer to Fig. 14:
It is likely that the lower seat o-ring (#11, Fig. 14)
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
place the lower o-ring on the step at the bottom
of the bore, verifying that it is in full contact with
the bore. Lubricate the bottom step and upper o-
ring (#11, Fig. 14) of the refurbished clapper-seat
subassembly. Insert the clapper-seat sub as-
sembly into the hand hole opening, lever (#7, Fig.
14) first and rotating the clapper-seat subassem-
bly until the lever faces the outlet of the deluge
valve. Next rotate the clapper-seat subassembly
90 degrees about the center axis of the valve un-
til the bottom of the clapper-seat sub assembly
faces the pushrod (#20, Fig. 14). Then rotate the
clapper-seat subassembly 90 degrees counter-
clockwise so that the clapper (#3, Fig. 14) is fac-
ing the outlet of the deluge valve and the lever
(#7, Fig. 14) is facing the pushrod (#20, Fig. 14).
Once the clapper seat subassembly is in this
position simply slide the assembly into the bore
of the valve, making sure it is straight to avoid
binding of the seat in the bore. Slightly twisting
the assembly will assist in getting the clapper-
seat subassembly properly seated. Once it is
verified that the clapper-seat sub assembly is
in the fully down position and the lever (#7, Fig.
14) is aligned with the pushrod (#20, Fig. 14),
clean and lubricate the two locking pins (#17,
(not shown) Fig. 14) with o-ring lubricant. Slide
the two locking pins into the deluge valve body
to lock the seat in place. Slightly twisting and
pressing down on the clapper-seat subassembly
will help the pins to slide in more easily. Then re-
install the 3/8” NPT pipe plugs (#19, (not shown)
Fig. 14). Reassemble the hand hole cover (#4,
Fig. 14) and set up the Model DDX Deluge Valve
as per the section “Resetting Model DDX Deluge
Valve Single Interlock Preaction Systems”.
7. 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. 13 or Fig. 14). 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 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). Close the valve
A (Fig. 15) that supplies water to the push rod
chamber, and open the Model B Manual Emer-
gency Station, valve D (Fig. 15).
b) Remove the trim at the unions nearest to the push
rod chamber cover (#3, Fig. 13 or #8 Fig. 14).
c) Take the push rod chamber cover (#3, Fig. 13
or #8, Fig. 14) off by removing the six retaining
screws (#26, Fig. 13 or #29, Fig. 14).
CONDITION ONE (Water coming out of the bleed
hole):
Water coming out of the bleed hole is caused by a leak-
ing diaphragm (#18, Fig. 13 or #34, Fig. 14). Visually in-
spect the push rod chamber cover (#3, Fig. 13 or #8,
Fig. 14) and piston (#17, Fig. 13 or #18, Fig. 14) to de-
termine 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 in-
side of the push rod chamber cover and reassemble the
six retaining screws (#26, Fig. 13 or #29, Fig. 14) with an
installation torque of 15 foot-pounds. Set up the Model
DDX Deluge Valve as per the section “Resetting Model
DDX Deluge Valve Single Interlock Preaction Systems”.
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 (#11,
Fig. 13 or #9, Fig. 14). Remove the piston-push rod sub-
assembly, push rod spring (#34, Fig. 13 or #32, Fig. 14),
and push rod guide (#11, Fig. 13 or #21, Fig. 14). Verify
by hand turning, that the push rod cannot be unscrewed
from the piston. Replace all O-rings and the push rod
guide (#21, #22 & #11, Fig. 13 or #9, #12 & #21, Fig. 14).
The correct installation torque for the pushrod guide is 35
inch-pounds. CAUTION: Do not over tighten the push
rod guide. Reassemble the components that were ini-
tially removed. Re-install the diaphragm (#18, Fig. 13 or
#34, Fig. 14) 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 back-
wards! 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
(#26, Fig. 13 or #29, Fig. 14) with an installation torque
of 15 foot-pounds. Set up the Model DDX Deluge Valve
as per the section “Resetting Model DDX Deluge Valve
Single Interlock Preaction Systems”.