System Design Considerations
The automatic sprinklers, air compressor, releasing devices,
electric releasing control equipment, re detection devices, manual
pull stations, and signaling devices which are utilized with this
Reliable Single Interlock Preaction System must be Loss Prevention
Certication Board (LPCB) approved, as applicable.
The system valve and all interconnecting piping must be located in
a readily visible and accessible location and in an area that can be
maintained at a minimum temperature of 40°F (4°C). Note: Heat
tracing is not permitted.
The redundant solenoid valves are operated and supervised by an
electrical releasing/control panel.
System Air Pressure Requirements
When a Reliable Single Interlock Preaction System is utilized,
the sprinkler system piping requires a minimum of 7 psi (0,5
bar) supervisory pneumatic pressure. The Model A Pressure
Maintenance Device, along with an additional air pressure regulator,
are used to maintain the system pneumatic pressure between 7 and
10 psi (0,5 and 0,7 bar) where a dry nitrogen gas supply or a clean,
dependable, and continuous (24 hours per day, 7 days per week)
compressed air source is available.
The section of the preaction trim that contains the two redundant
normally-closed solenoid valves, and the supply to the pneumatic
actuator require pneumatic pressure settings per Table C. When
establishing the preaction system for service, refer to Table C
of this bulletin for the correct pneumatic pressure settings for a
corresponding water supply pressure.
Note: During the initial system set-up, a higher pneumatic pressure
may be required in order to properly seat the internal diaphragm of
the pneumatic actuator.
Refer to Reliable Bulletin 251 for instructions on how to modify these
pressure settings.
Bulletin 739
January 2021
Page 4 of 9
www.reliablesprinkler.com
Water Pressure
psi (bar)
Pneumatic Pressure to be Pumped
into Sprinkler System, psi (bar)
Maximum Not Less Than Not More Than
20 (1.4) 10 (0.7) 14 (0.9)
50 (3.4) 12 (0.8) 16 (1.1)
75 (5.2) 13 (0.9) 17 (1.2)
100 (6.9) 15 (1.0) 19 (1.3)
125 (8.6) 16 (1.1) 20 (1.4)
150 (10.3) 17 (1.2) 21 (1.4)
175 (12.1) 18 (1.2) 22 (1.5)
System Pressure
Table C
System Electrical Requirements
All releasing, alarm and detection devices in this Reliable Single
Interlock Preaction System are supervised by the Preaction Panel
Series 1000 MK4. The power supply, the standby emergency
power supply, battery charger, and the rectier circuitry are all
contained within this panel. For additional and detailed wiring
information, refer to the manufacturer’s literature included with the
Releasing Control Panel.
Note: In order for the solenoid valve to maintain Reliable warranty
it must remain sealed as it came from the factory. If there are
concerns about the valve’s internal components, immediate
replacement is recommended.
Valve Size:
Equivalent Length:
Cv
C = 120 C = 100
2" (50mm) 4.4 ft (1,3 m) 3.1 ft (1,0 m) 101
2-1/2" (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
Friction Loss
Table D
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