12.
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 subas-
sembly 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-clapper-
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 Type D
Double Interlock Preaction System.”
Pushrod Chamber Maintenance - Model DDX
Deluge Valve
A small bleed hole is located on the underside of the pushrod
chamber. Water leakage from the bleed hole can be caused by a
ruptured pushrod diaphragm:
a) Disable detection system.
b) Shut down the valve controlling water supply to the Del-
uge Valve. Relieve the inlet pressure by opening the main drain
valve. Close the pushrod chamber supply valve and open the
Model B Manual Emergency Station.
c) Remove the trim at the unions nearest to the pushrod
chamber cover.
d) Take the pushrod chamber cover off by removing the six
retaining screws.
e) 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-di-
rectional and 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 en-
gages the pushrod.
f) Reassemble the six retaining screws with an installation
torque of 15 foot-pounds in a star pattern.
g) Set up the Model DDX Deluge Valve as per the section
“Resetting Model DDX Type D Double Interlock Preaction Sys-
tem.”
Draining Excess/Condensate Water from the System
1. Notify the owner and monitoring company that maintenance is
being performed on the system.
2. Close the main water control valve.
3. Open the Main Drain Valve.
4. Open the Condensate Drain Valve until all water has drained.
5. Close Condensate Drain Valve.
6. Partially open the Main Water Control Valve.
7. Slowly close the Main Drain Valve.
8. Fully open the Main Water Control Valve.
9. Notify the owner and monitoring company that the system has
been returned to service.
Содержание DDX
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