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GW - Model C300 -Fluid Control Valve Pressure Regulating With Actuator and Solenoid
This valve is both electrically & pneumatically actuated and provides pressure control. This valve is used where a constant downstream pressure and a controlled smooth opening and closing of the deluge water supply is called for. The valve`s adjustable restrictors can be set to provide the opening- and closing speed desired, to prevent the damaging effects of reaction forces and water hammer. The valve is fitted with an external heavy duty solenoid and a pneumatic actuator valve to facilitate reliable electrical and/or pneumatic actuation. Both actuators are fitted with a latch that locks the deluge valve open when activated, thus requireing manual re-setting to close.
This valve is typically fitted into a fire water main to open upon instruction, and provide a regulated downstream pressure to a pre-set value, irrespective of the flow rate and up-stream pressure conditions. Installation can be either horizontally or vertically. The GW C-300 deluge valve is “self-powered” – and utilizes the system upstream (inlet) pressure to hydraulically close, open and regulate. It is operated pneumatically or electrically via the actuator and solenoid valve integrated in the valve trim.
Pilot line air pressure drop, or energizing the solenoid (NC) will trip the deluge valve. The actuator and solenoid valve is latched in the fail-safe open position, and must be manually reset locally.
On request the actuator and solenoid is also available without latch/manual reset, for remote resetting of the deluge valve.
On request the solenoid can be configured to normally open (NO), to trip the deluge valve when de-energized.
This elastomeric sleeve type valve is normally closed, and is maintained in the closed position by diverting upstream water directly to the flow control sleeve cavity. This is accomplished by the pneumatic actuator and solenoid valve mounted on the deluge Valve in the pressurized (air on), and de-energized (power off) position.
Upon instruction, i.e. “air off” or “power on” the actuator or solenoid switches to open position and water is allowed to drain from within the sleeve cavity, thus releasing the hydraulic pressure that seals the sleeve against the seat. The deluge valve opens in a controlled manner as upstream pressure lifts the sleeve off the seat and water starts flowing through the valve. The opening (and closing) speed is adjustable via restrictors controlling the in and out flow to the sleeve cavity, thus preventing water hammer and damage to downstream pipework and components.
Pressure regulation is accomplished by the pilot control valve which will feed or drain water to/from the sleeve cavity, to open or close the flow orifice as required, when sensing the downstream pressure and comparing it to the pre-set pilot pressure.
The valve is maintained in the open position by the pneumatic actuator or solenoid valve which remains in the “latched on” position once operated.