DN40 ~ DN200 electrical detection systems or manual / electric emergency manual DV-5 electric / pneumatic double interlock pre-action system valve opening means is operated Chengdu fm certified fire valves, solenoid valve is opened. Only when one or more closed nozzle operation, the system exhaust pipe, pneumatic valve is opened. Because the solenoid valve and pneumatic valve installed in series in the pre-action valve diaphragm chamber discharge line, Shandong fm certification Fire cocks, only in closed nozzle detection system operation and action two conditions are met, solenoid valves and pneumatic valves are open case Under the pre-action valve to open. Detection system malfunction or nozzle, the pipe network damage is not simultaneous, pre-action valve can not be opened. DV-5 electric / electrical double interlock pre-action system DN40 ~ DN200 electric / electrical double interlock pre-action system consists of a pre-action valve (DV-5 Deluge valve and check valve composition) and the appropriate piping, fire detection systems, air compressor, automatic pressure maintenance device, closed nozzle, pipe networks and water supply control valve. Electric / electrical double interlock pre-action system designed for applications requiring maximum water level to prevent systematic errors places, Xinjiang fm certified fire valves, such as cold storage. It can also be used for water damage sensitive political and economic spaces, such as computer rooms, storage of valuables, heritage warehouses, libraries, archives, hotels, convention centers and other places. Electric / electrical double interlock pre-action system requires the installation of electrical fire detection systems, pre-action valve with a solenoid valve actuating means are electric start piping. The first electrical signal is an electrical detection systems or manual / electric emergency open valve means. The second electrical signal is a low-pressure warning system pipe network pressure switch, closed nozzle action, the system pipe network pressure drop, low alarm pressure switch. When two independent signals are sent to the fire control box, fire control box issue 24VDC solenoid valve opening signal, pre-action pressure relief valve diaphragm chamber, fm certification Fire cocks, pre-action valve is opened. If there is only a signal, fire control box only send an alarm signal, pre-action valve will not open. Shenyang fm certification Fire cocks | Hubei fm certification Fire Valve | Electromechanical by the Hubei Chong Chong Anyuan Anyuan Electrical Equipment Co., Ltd. to provide. Hubei Chong Anyuan Electrical Equipment Co., Ltd. (www.hbcay119.com) (www.hbcay119.com) strong, credible, in Wuhan, Hubei fire equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead electromechanical create Anyuan into the brilliant and you work for a better future!