DN40 ~ DN200 electrical detection systems or manual / electric emergency manual DV-5 electric / pneumatic double interlock pre-action system valve opening means, the solenoid valve is opened. Only when one or more closed nozzle action, the exhaust system pipe network, Shanghai fm certified fire valves, pneumatic valve is opened. Because the solenoid valve and pneumatic valve installed in series in the pre-action valve diaphragm chamber discharge line, only in the detection system operation and closed nozzle action both conditions are met, the electromagnetic valves and pneumatic valves are turned on, Tibet fm certification Fire valve, preaction valve to open. Detection system malfunction or nozzle, the pipe network damage is not simultaneous, pre-action valve can not be opened. ACC-1 dry-type valve Accelerator can automatically adjust the system in small, slow pressure changes. And when the system fast and stable pressure drop (eg sprinkler operation), Shandong fm certification Fire cocks, accelerator action. After the accelerator operation, the intermediate chamber pressurized gas transmission system side to the DPV-1 Dry-type valve, the valve will remain closed differential pressure damage and the dry valve is open. Shanghai fm certification Fire cocks | Year Anyuan Electromechanical | Fire Valve Tianjin fm certified by the Hubei Chong Anyuan Electrical Equipment Co., Ltd. to provide. Hubei Chong Anyuan Electrical Equipment Co., Ltd. (www.hbcay119.com) (www.hbcay119.com) is a leader in Wuhan, fire protection equipment, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum Limits to meet customer needs. Anyuan electromechanical leadership in creating the staff warmly welcome all inquiries negotiations to create create a better future for electromechanical Anyuan.