VSR-F type and VS-F-type flow indicator VSR-F and VS-F type is used for wet sprinkler systems paddle type flow indicator, valve manufacturers registered by the United States UL, FM certification test valve, the United Kingdom LPC certified stainless steel valves for standard 10 # -40 # steel valves legend, specifications for 50mm to 200mm. The device can also be used for large systems split device switch. DV-5 with a single interlock preaction pressure monitoring system (power-up or a wet or dry start to start) DN40 ~ DN200 single interlock preaction system depending on the system start-up mode, the pre-action valve and corresponding piping, fire detection system (initiated by electrical detection or wet or dry sprinkler nozzle or manual start / electric control valve openers), air compressors and automatic pressure maintenance device, closed fire sprinkler pipe network and water supply control valve. NFPA requirements nozzle number more than 20, the system network must be inflated, automatic monitoring system pipe network (sprinklers, pipes, pipe components) integrity. Pipe network monitoring system automatically maintains the pressure at 10 ± 2psi (0.69 ± 0.14bar), monitoring the gas pressure in the low pressure alarm switch can be reduced to atmospheric pressure 5 ± 1psi (0.34 ± 0.07bar) time signals that the system pipe network is abnormal leak. Valve Manufacturers | Year Anyuan Industrial (certified) | New Island Anyuan valve by the Hubei Chong 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.