Hydraulically Actuated, Anti-Columning, Manual Reset Deluge Valve.
Hydraulically actuated, pilot controlled deluge/pre-action valve, actuated by the pipeline pressure. The valve is closed in its normal, set position and opens when the hydraulic pressure drops in a pressurized sensor line, tripping a hydraulic relay. The valve must be manually reset following automatic actuation. An emergency manual release valve is ﬁtted as standard.