Light water alarm impeller designed with the latest technology, can emit a high-frequency, high-intensity sound. Alarm, envelopes accessories and casing made of corrosion-resistant alloys by the drive shaft without lubrication. When installing the bell placed in an envelope tightly fitting into, so no special cover or special protection. This is suitable for all types of sprinkler systems. BH-7 with a window-type test valve end by the end of the test valve ball and windows composed of two valves, brass body. Intake of female ports, the outlet for the external thread interface. Inlet side valve is "on / off" type two, the body with the flow direction indicator. Intermediate valve "On / Test" type two, when the two valves is set to "on" position when pneumatic valves, the equivalent of DN25 (or stainless steel valves DN32 or DN50) valve, when set: the test "position, equivalent to DN15 nozzle flow coefficient. selection should be installed at the inlet side of the package design pressure gauge Valve legend, a Anyuan electromechanical (certification), the valve by the Hubei Chong Anyuan Electrical Equipment Co., Ltd. to provide Hubei Chong Anyuan electromechanical equipment limited liability company (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, and satisfy customer needs In creating Anyuan electromechanical leadership with the staff warmly welcome all inquiries negotiations to create create a better future for electromechanical Anyuan.