5.
Note: In order for the solenoid valve to maintain a warranty
it must remain sealed as it came from the factory. If there are
concerns about the valve’s internal components, immediate re-
placement is recommended.
System Operation (Single Interlock)
To fully activate and discharge water from the Reliable
Model DDX Type D PrePaK in a single interlock appli-
cation, a fire detection device (smoke, heat, etc.; or two
devices with cross-zoned detection) must activate. Sub-
sequently, a fire sprinkler must open.
When the single 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 clapper in the closed po-
sition against the water supply pressure.
Energizing the releasing solenoid valve allows the
deluge valve push-rod chamber to be vented to drain.
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 pressure, 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 Bulletin 519 for further details.
Once the clapper has opened, the lever acts as a latch,
preventing the clapper from returning to the closed po-
sition. 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 Con-
trol Panel’s latching feature until it is reset for operation.
After system shutdown and draining, the Model DDX
Deluge Valve is easily reset without special tools using
the external reset feature. Restore detection devices by
resetting or replacing any operated device. Once detec-
tion devices are restored, (the Potter Model PFC-4410-
RC Releasing Control Panel reset), and supply pressure
is re-supplied to the push-rod chamber, the deluge valve
is reset.
System Operation (Double Interlock)
To fully activate and discharge water from the Reliable
Model DDX Type D PrePaK in a double interlock applica-
tion, two independent events must coexist. An electrical
fire detection device (smoke, heat, etc.) and the system
air pressure switch must be activated. This pressure
switch is activated by a reduction of the system pneu-
matic 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 initiation
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 clapper in the closed po-
sition against the water supply pressure.
Energizing the releasing solenoid valve allows the
deluge valve push-rod chamber to be vented to drain.
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 pressure, 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 Bulletin 519 for further details.
Once the clapper has opened, the lever acts as a latch,
preventing the clapper from returning to the closed po-
sition. 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 Con-
trol Panel’s latching feature until it is reset for operation.
After system shutdown and draining, the Model DDX
Deluge Valve is easily reset without special tools using
the external reset feature. Restore detection devices by
resetting or replacing any operated device. Once detec-
tion devices are restored, (the Potter Model PFC-4410-
RC Releasing Control Panel reset), and supply pressure
is re-supplied to the push-rod chamber, the deluge valve
is reset.
Resetting Single And Double Interlock Systems
1. Close the main valve controlling water supply to the
deluge valve and close the ¼” air shutoff valve.
2. Close the pushrod chamber supply valve.
3. Open the main drain valve 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 the Manual Emergency
Release Valve. 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 to force the ball
from its seat, and drain any water in the alarm line.
6. With the Model B Manual Emergency Station open,
push in and rotate the deluge valve external reset
knob counterclockwise (when facing valve) until
you hear a distinct clicking noise, indicating that the
clapper has closed.
