Features
• Redundant Solenoid Valve Release
• Externally Resetable Clapper
• One Main Drain
Product Description
Reliable Single Interlock Preaction Systems are designed for
water-sensitive areas that require protection from inadvertent
water flow into the sprinkler system piping. A single event, the
activation of the electrical detection system, causes the valve to
operate and flow water into the piping network.
Sprinkler piping in single interlock systems can effectively
be supervised by means of the Reliable Model A Pressure
Maintenance Device (provided) and a tank-mounted air
compressor. Loss of supervising pneumatic pressure, due to
a damaged sprinkler or sprinkler pipe will not cause water to
flow through the Model EX Valve and into the system piping. A
signicant loss of pneumatic pressure will activate a trouble-
annunciating device when the system pressure falls below a
predetermined pressure level.
The system incorporates two normally closed solenoid valves on
the releasing trim. These solenoid valves, when closed, retain
sufcient AIR pressure on the pneumatic actuator, which in turn
preserves sufcient WATER pressure in the push rod chamber
of the Model EX Valve in order to maintain it closed. When the
electrical detection system senses the presence of re, the
electrical releasing control panel activates re alarm devices and
energizes the two redundant, normally-closed solenoid valves into
the open position.
Energizing the solenoid valves relieves the air pressure on the
pneumatic actuator, thereby releasing the water pressure that it
was retaining. This in turn relieves the pressure in the push rod
chamber of the Model EX Valve. Venting the push rod chamber
will open the Model EX Valve and allow water to flow into the
sprinkler system.
Water flowing into the sprinkler system piping will simultaneously
produce water pressure that causes the transfer of contacts in
the pressure switch mounted in the trim. This pressure switch can
www.reliablesprinkler.com
electrically initiate the shutdown or startup of equipment, such as
computers or other second alarm devices. The flow of water into
the sprinkler system piping effectively converts the dry system
into a wet pipe system. In the event that the re subsequently
produces sufcient heat to operate a re sprinkler, water will flow
from that sprinkler, controlling or suppressing the re.
The major benets of a single interlock preaction system, when
compared with a wet pipe (deluge) system are as follows:
1. A re alarm sounds prior to the operation of a sprinkler,
which may enable extinguishing the re by handheld means
before the actual operation of any sprinklers and subsequent
water damage.
2. A trouble annunciator signals whenever the integrity of the
piping or sprinklers is accidentally or intentionally disturbed;
however, no water flow or water damage will occur at that
time.
3. Speedy detection and an early re alarm are provided by
re detectors, without the delay associated with water flow
detection in the event of a re. Note: with a wet pipe system,
the re alarm is delayed until after water has begun flowing
from an operated sprinkler.
Valve Size End Connection Approx. Shipping Weight
2" (50mm), 2-1/2" (65mm), 76mm &
3" (80mm)
Groove/ Groove 44lbs (20kg)
4" (100mm)
Groove/ Groove
74lbs (34kg)Flange/ Groove
Flange/ Flange
6" (150mm) & 165mm
Groove/ Groove
105lbs (48kg)Flange/ Groove
Flange/ Flange
8” (200mm)
Groove/Groove
158lbs (72kg)
Flange/Flange
Table A
Bulletin 739 January 2021
Bulletin 739 January 2021
Model EX Single Interlock
Preaction Type A (LPCB)
2”, 2-1/2”, 76mm, 3”, 4”, 6”, 165mm, & 8”
Availability: UK
To Next Page
Need help?
General
