Reliable EX Series User Manual

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
signicant 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
sufcient AIR pressure on the pneumatic actuator, which in turn
preserves sufcient 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 sufcient heat to operate a re sprinkler, water will flow
from that sprinkler, controlling or suppressing the re.
The major benets 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

Reliable EX Series Specifications

General

Brand	Reliable
Model	EX Series
Category	Control Unit
Language	English

Summary

Product Description and Specifications

Product Description

Detailed explanation of Reliable Single Interlock Preaction Systems for water-sensitive areas requiring protection from inadvertent water flow.

Technical Specifications

Key technical data including pressure rating, minimum/maximum temperatures, and factory test pressure.

Model EX Type A Dimensions

Installation dimensions for the Model EX Type A valve, presented in a table with various valve sizes.

System Design, Operation, and Reset

System Design Considerations

Requirements for system components, location, and environmental factors, ensuring compliance with LPCB standards.

System Air Pressure Requirements

Specifies minimum supervisory pneumatic pressure and settings for system operation based on water supply pressure.

System Electrical Requirements

Details supervision by the Preaction Panel and power supply considerations for the system's detection and alarm devices.

Resetting the Model EX Single Interlock System

Step-by-step procedure for resetting the Model EX Valve after system operation, testing, or maintenance.

Maintenance, Testing, and Troubleshooting

Inspection and Testing Procedures

Guidelines for inspecting system valves, alarms, and performing operational tests per NFPA 25 requirements.

Maintenance Responsibilities

Owner's responsibility for periodic inspection, testing, cleaning, and component replacement of the fire protection system.

Draining Excess/Condensate Water

Procedure for safely draining water from the system to prevent damage or operational issues, notifying relevant parties.

Clapper Gasket and Seat Replacement

Detailed steps for inspecting and replacing the clapper gasket, seat, and associated components for the Model EX valve.

Troubleshooting Common Issues

Guidance for diagnosing and resolving common problems like mechanical sprinkler alarm failures or water/air leaks.

Pushrod Chamber Diaphragm/O-Ring Replacement

Procedure for replacing the pushrod chamber diaphragm and O-rings, addressing specific conditions for air or water leaks.

Approvals, Ordering, and Service Kits

Listing & Approvals

Information on LPCB approvals and compliance with relevant industry standards and supplementary requirements.

LPCB Installation Requirements

Key installation, configuration, and maintenance requirements mandated by the Loss Prevention Certification Board.

Ordering Information

Specifies how to order the Model EX Single Interlock Preaction System, including size and end configuration.

Service Kits Availability

Lists available service kits for routine servicing, repair, and replacement of components for the Model EX valve.