pdf Automatic Water Control Valve, Non regulating with Strainer & Restrictors + Integral Pneumatic Actuator (latching)
This valve is used where a controlled and 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 a compact integral pneumatic actuator to facilitate activation from e.g. pilot line air pressure drop. The actuator if fitted with a latch that locks the actuator and deluge valve open when activated, thus requireing manual re-setting to close.