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After system shutdown and draining, the Model DDX Deluge

Valve is easily reset without special tools (see Fig. 9 or 10). Re-
store detection devices by resetting or replacing any operated
device. Once detection devices are restored, (the Potter Model
PFC-4410-RC Releasing Control Panel reset), and supply pres-
sure is re-supplied to the push-rod chamber, the deluge valve
is reset.

System Operation (Double Interlock)

To fully activate (water flow) the Reliable Model DDX 4” (100

mm), 6” (150 mm) or 8” (200 mm) PrePaK in a double interlock
application, two independent events must coexist. An electrical
fire detection device (smoke, heat, etc.) and the system air pres-
sure switch must be activated. This pressure switch is activated
by a reduction of the system’s pneumatic pressure (as a result of
sprinkler operation). Both of these events will cause the control
panel to energize the solenoid valve, thereby releasing water
through the deluge valve and into the sprinkler system. The ini-
tiation of either one of these events will only cause an alarm to
annunciate, and will not fill the sprinkler system.

When the double interlock preaction system is set for service,

the supply pressure acts both on the underside of the deluge
valve’s clapper and on the valve’s push rod by means of the
pressurized push rod chamber. The pressure force acting on
the push rod, when utilized with the mechanical advantage of
the deluge valve’s lever, is more than sufficient to hold the clap-
per in the closed position against the water supply pressure.

Energizing the releasing solenoid valve allows the deluge

valve’s push-rod chamber to be vented to drain through its
outlet. Since the pressure cannot be replenished through the
inlet restriction as rapidly as it is vented though the outlet, the
push-rod chamber pressure falls rapidly. When the push-rod
chamber pressure drops below one-third of the supply pres-
sure, the opening force acting beneath the clapper becomes
greater than the push-rod force acting on the lever. This causes
the clapper to open. Refer to Reliable Bulletins 518 and 519 for
further details.

Once the clapper has opened, the lever acts as a latch, pre-

venting the clapper from returning to the closed position. Water
from the supply flows through the deluge valve into the system
piping. Water also flows through the deluge valve alarm outlet
to activate any water flow alarm devices. Note that the solenoid
valve will be maintained open by the Potter Model PFC-4410-
RC Releasing Control Panel’s latching feature until it is reset for
operation.

After system shutdown and draining, the Model DDX Deluge

Resetting Single And Double Interlock Systems

Refer to Fig. 9 or 10.
1. Close the main valve controlling water supply to the deluge

valve and close the ¼” air shutoff valve, valve J.

2.  Close the pushrod chamber supply valve, valve A.
3.  Open the main drain valve, valve B, and drain system.
4.  Open all drain valves and vents at low points throughout

the system, closing them when flow of water has stopped.
Open valve D.

Note:

The above steps accomplish the

relieving of pressure in the pushrod chamber of the deluge
valve.

5. Push in the plunger of ball drip valve, valve F, to force the

ball from its seat, and drain any water in the alarm line.

6. With the Model B Manual Emergency Station, valve D,

open, push in and rotate the deluge valve’s external reset
knob clockwise until you hear a distinct clicking noise, indi-
cating that the clapper has closed.

Note:

The reset knob

can be rotated only after pressure in the pushrod chamber
is reduced to atmospheric conditions (0 psig).

7. Inspect and replace any portion of the sprinkler system

subjected to fire conditions.

8. Verify that the following valves are in their respective posi-

tions:
valve C – open, valve E – closed, valve H – closed,
valve K – open, valve M – closed.

9. Open valve A and allow water to fill the deluge valve’s push-

rod chamber. Close valve D.

10. Bleed any air from the actuation piping by energizing the

solenoid valve. This is done by operating a detector or an
electric manual emergency station. While water is flowing
through the solenoid valve, cause it to close by pressing the
system reset button on the Potter PFC-4410-RC Releasing
Control Panel.

Note:

All detection devices must be reset

before the releasing/control panel can be reset.

11. Open the ¼” air shutoff valve, valve J, to restore air pres-

sure in the sprinkler system. The rapid air-fill shutoff valve,
valve M, may be opened here to expedite the filling of the
sprinkler system.

12. Open slightly the main valve controlling water supply to the

Model DDX Deluge Valve, closing drain valve B when wa-
ter flows. Observe if water leaks through the ball drip valve,
valve F, into the drip cup or drain manifold, G. If no leak
occurs, the deluge valve’s clapper is sealed. Open slowly,
and verify that the main valve controlling water supply is
fully opened and properly monitored.

13. Verify that valve A is open.
14. Secure the handle of the Model B Manual Emergency Sta-

tion, valve D, in the OFF position with a nylon tie (supplied
with the assembly).

15. Press the system reset button on the Potter PFC-4410-RC

Panel to place the system in the ready condition.

Note:

All

detection devices must be reset before the panel can be
reset.

Maintenance

The Reliable Model DDX PrePaK and associated equipment

shall periodically be given a thorough inspection and test. NFPA
25, Standard for the Inspection, Testing and Maintenance of
Water Based Fire Protection Systems, provides minimum main-
tenance requirements. Systems should be tested, operated,
cleaned and inspected at least annually, and parts replaced as
required. Periodically open the air/condensate drain valve (refer
to Fig. 9 or 10) beneath the air tank to drain any condensate ac-
cumulation. Bulletin 518 provides information for maintaining the
Model DDX Deluge Valve. Potter Manual #5403550 provides
information for maintaining the PFC-4410-RC Releasing Control
Panel.