valve's diaphragm and plug against the valve seat [ ], sealing it drip-tight and keeping the system piping dry. the porv is held closed by the pneumatic pressure maintained in the dry pilot line, supplied through the solenoid [ ]. under fire condition, a dry pilot line pneumatic pressure drop, or an electric...
tandem with a hydraulic float level control valve (typically normally open version) at reservoir inlet maintaining emergency minimal reservoir level (typically normally open, low pressure, double chamber activated version) reservoir outlet water reservoir level control system, featuring the - as an electric...