11.
8. Friction loss (Expressed in equivalent length of Schedule
40 pipe, based on Hazen & Williams formula:
Valve Size:
Equivalent Length:
Cv
C = 120 C = 100
2" (50mm) 4.4 ft (1,3 m) 3.1 ft (1,0 m) 101
2½" (65mm) 6.0 ft (1,8 m) 4.3 ft (1,3 m) 236
76mm 7.7 ft (2,3 m) 5.5 ft (1,7 m) 241
3" (80mm) 12.6 ft (3,8 m) 9.0 ft (2,7 m) 254
4" (100mm) 14 ft (4,3 m) 10 ft (3,0 m) 469
165mm 29.4 ft (9,0 m) 20.9 ft (6,4 m) 886
6" (150mm) 29.4 ft (9,0 m) 20.9 ft (6,4 m) 886
8" (200mm) 53.5 ft (16,3 m) 38.1 ft (11,6 m) 1516
9. Installation position: Vertical ONLY.
Trim Descriptions
The Single Interlock Preaction Trims for the Reliable Model
DDX Deluge Valve are arranged for rapid, easy, and compact
attachment, and serve as connection points to Reliable Model
C Mechanical Alarms and other devices.
The available Model DDX Single Interlock Preaction System
trim sets are:
• Wet Pilot Line Single Interlock Preaction Trim
• Dry Pilot Line Single Interlock Preaction Trim
• Electric Actuation Single Interlock Preaction Trim
All three trim congurations can be ordered as individual
parts, in time-saving segmentally assembled kit forms, or fully
assembled to the Model DDX Deluge Valve (with or without a
control valve).
The Model B Hydraulic Manual Emergency Station is a stan-
dard item of all Deluge Valve trim sets. It consists of an alumi-
num nameplate mechanically attached to a ball valve. The valve
handle in its OFF position is guarded against accidental turning
to the ON position (and system discharge) by a nylon cable tie
provided with each trim kit. The cable tie is inserted, after the
system has been restored for operation. The nylon cable tie is
designed to allow, in case of an emergency, forceful turning of
the valve handle to the ON position. As an alternative to the
Model B Hydraulic Manual Emergency Station, the Model A
Hydraulic Manual Emergency Pull Box (see Bulletin 506) is also
available and can be provided as an option.
Model F1-FTR xed temperature pilot line detectors and
spacing requirements are described in Bulletin 180.
Maintenance
Reliable Single Interlock Preaction Systems and associated
equipment shall periodically be given a thorough inspection
and test. NFPA 25, Inspection, Testing and Maintenance of
Water Based Fire Protection Systems, provides minimum main-
tenance requirements. System components shall be tested,
operated, cleaned, and inspected at least annually, and parts
replaced as required.
Resetting Model DDX Single Interlock
Preaction Systems
1. Close the valve controlling water supply to the Deluge Valve
and close the air or nitrogen supply to the sprinkler system.
2. Close the pushrod chamber supply valve.
3. Open 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 Model B Manual Emergency Station to relieve pressure in
the pushrod chamber of the Deluge Valve.
5. With the alarm line valve open, push in the plunger of ball drip
valve, forcing the ball from its seat, and drain the alarm line.
6. With the Model B Manual Emergency Station open, push in
and rotate the Deluge Valve’s external reset knob counter-
clockwise (when facing the valve), until you hear a distinct
noise indicating that the clapper has reset. Note: The reset
knob can be rotated only while pressure in the pushrod cham-
ber is vented to atmospheric conditions (0 psig).
7. Inspect and replace any portion of the detection system and/or
sprinkler system subjected to re conditions.
8. Open the pushrod chamber supply valve and allow water to ll
the pushrod chamber. Close the Model B Manual Emergency
Station .
9. Bleed all air from the actuation piping:
A. Wet Pilot Line Single Interlock Preaction Trim—bleed the
entire wet pilot line until all air is removed at the most
remote sprinkler.
B. Electric Actuation Single Interlock Preaction Trim—open
the solenoid valve by operating a detector or an elec-
tric manual emergency station. While water is flowing
through the solenoid valve, cause it to close using the
release control panel reset.
C. Dry Pilot Line Single Interlock Preaction Trim— If pres-
surized, remove pneumatic pressure from Model LP Dry
Pilot Actuator, allowing water to flow through the actua-
tor. When all air has been expelled from the release line,
and there is a solid flow of water into the drain cup , apply
compressed air or nitrogen through the pressure main-
tenance device to close the pilot line actuator. Adjust the
air or nitrogen pressure to the appropriate value in Table
A as indicated on air pressure gauge.
10. Close the alarm line valve. Open the air or nitrogen supply
quick ll valve to restore supervisory pressure in the sprinkler
system, then set the pneumatic supply to automatic operation.
Note: To build supervisory air pressure in the sprinkler
system, it may be necessary to temporarily close the
main drain valve until air pressure has built up to the
manufacturers recommended levels.
11. Open the alarm line valve. Verify the main drain valve is open.
Open slightly the main valve controlling water supply to the
Model DDX Deluge Valve, closing the main drain valve when
water flows. Observe if water leaks through the ball drip valve
into the drip cup . If no leak occurs, the Deluge Valve clapper is
sealed. Open slowly and verify the main valve controlling water
supply is fully opened and properly monitored.
12. Verify that the pushrod chamber supply valve and alarm line
valve are open. The pushrod chamber supply valve must
remain open when the Deluge Valve has been reset, to
maintain water pressure in the pushrod chamber.
13. Verify that the Model B Manual Emergency Station is secured
in the OFF position with the appropriate nylon tie.
Inspection and Testing
1. Water supply — Conrm that valves controlling water supply
to the Deluge Valve are opened fully and properly monitored.
2. Alarm line — Conrm that the alarm line valve is open and
remains in this position.
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