Reliable Sprinkler RELIABLE Single Interlock Preaction System 6103060028 - Manual (Page 15)

15.
just if necessary. Clean and lubricate the two
locking pins (#17 (not shown) Fig. 6) with
O-ring lubricant and drive them into the de-
luge valve body. Reinstall the 3/8” NPT pipe
plugs (#19 (not shown) Fig. 6). Reassemble
the handhold cover and set up the Model
DDX Deluge Valve as per the section of this
bulletin entitled “Resetting the Single Inter-
lock Preaction System”.
3. 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. 6). 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. V).
Close valve A (Fig.
7 ), the valve that supplies
water to the push rod chamber, and open the
Model B Manual Emergency Station, valve D
(Fig.
7 ).
B) Remove the trim at the unions nearest to the
push rod chamber cover (#8, Fig. 6).
C) Take the push rod chamber cover (#8, Fig. 6)
off by removing the six retaining screws (#29,
Fig. 6).
Condition #1: Water coming out of the bleed
hole:
Water coming out of the bleed hole is caused by a
leaking diaphragm (#34, Fig. 6). Visually inspect the
push rod chamber cover (#8, Fig. 6) and piston (#18,
Fig. 6) 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 re-assemble the six retaining
screws (#29, Fig. 6) with an installation torque of 15
foot-pounds. Set up the Model DDX Deluge Valve as
per the section of this bulletin entitled “Resetting the
Single Interlock Preaction System”.
Condition #2: 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. 6). Remove the piston-push rod subas-
sembly, push rod spring (#32, Fig. 6), and push rod
guide (#21, Fig. 6). Verify by hand turning, that the
push rod cannot be unscrewed from the piston. Re-
place all of the O-rings and the push rod guide. The
correct installation torque for the push rod guide is 35
inch-pounds. CAUTION: Do not over-tighten the
push rod guide. Re assemble the components that
were initially removed. Re-install the diaphragm (#34,
Fig. 6) if it appears to be in good shape, otherwise,
replace it also. NOTE: The diaphragm has two differ-
ent surfaces, it is not bi-directional. It will fail if in-
stalled backwards! Roll the diaphragm so that the
smooth surface (the pressure side) conforms to the
inside of the push rod chamber cover and re-assem-
ble the six retaining screws (#29, Fig. 6) with an instal-
lation torque of 15 foot-pounds. Set up the Model
DDX Deluge Valve as per the section of this bulletin
entitled “Resetting the Single Interlock Preaction Sys-
tem”.
Fig. 8