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Automatic water control valve (deluge valve) shall be electrically-actuated
and rated for a working pressure of 1207 kPa 175 psi. Valve shall be
capable of being reset without opening the valve. Electrical solenoid
valve used to actuate the water control valve shall be an integral
component of the valve or shall be approved for use by the water control
valve manufacturer. Solenoid valve shall be rated at 24 volts direct
current, and shall be normally closed type that operates when energized.
Solenoid valves shall be rated for a maximum pressure differential of 1207
kPa 175 psi. Water control valve shall be equipped with a means to prevent
the valve from returning to the closed position until being manually reset.
Assembly shall be complete with the valve manufacturer's standard trim
piping, drain and test valves, pressure gauges, and other required
appurtenances. Each assembly shall include an emergency release device for
manually tripping the water control valve in the event of a power or other
system failure. Device shall be a standard accessory component of the
valve manufacturer and shall be labeled as to its function and method of
operation. Valves located in hazardous locations shall be approved for the
hazard classification of the area where located.
2.7
SUPERVISORY AIR SYSTEM
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NOTE: Supervisory air is not appropriate for deluge
systems. Delete this section and reference to
supervisory air for deluge systems and for
unsupervised preaction systems.
Show the power supply to the air compressor and to
the low air pressure alarm device on the drawings.
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2.7.1
Air Compressor
Air compressor shall be single stage oil less type, air cooled,
electric-motor driven, equipped with a check valve, centrifugal pressure
and moisture unloader, pressure switch for automatic starting and stopping.
Pressure switch shall be set to start the compressor at [140] [_____] kPa
[20] [_____] psi and stop it at [200] [_____] kPa [30] [_____] psi. A
safety relief valve, set to operate at [450] [_____] kPa, [65] [_____] psi,
shall be provided. The compressor shall be sized to pressurize the system
to [200] [_____] kPa [30] [_____] psi within 30 minutes.
2.7.2
Air Pressure Maintenance Device
Device shall be a pressure regulator that automatically reduces supply air
pressure to the minimum pressure required to be maintained in the piping
system. The device shall have a cast bronze body and valve housing
complete with diaphragm assembly, spring, filter, ball check to prevent
backflow, 1.6 mm 1/16 inch restriction to prevent rapid pressurization of
the system, and adjustment screw. The device shall be capable of reducing
maximum inlet pressure of 680 kPa 100 psi to a fixed outlet pressure
adjustable to [70] [_____] kPa [10] [_____] psi.
2.7.3
Air Supply Piping System
Each preaction system shall be equipped with a separate pressure
maintenance device, shutoff valve, bypass valve and pressure gauge.
Piping
SECTION 13945A
Page 21
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