AV-1 type alarm valve piping accessories include: system pressure gauge, bypass valve, the main drain valve and the alarm test valve. The bypass valve allows the pressure to produce a small amount of the increase and the slow flow of water into the system-side line without causing the valve to open and pressure valves, to reduce the possibility of false alarms. AV-1-300 type rated working pressure of 2.07Mpa. AMD-1 pressure-pressure maintenance device AMD-2 Air Compressor controlled pressure maintenance device AMD-1 type pressure-pressure to maintain the pressure regulator valve unit with plastic field adjustable for pre-action system, dry system or deluge system, preaction system pressure dry pipe network control start. AMD-1 using compressed air in place, such as an air compressor with a pressure tank, factory air, nitrogen bottle, air pressure with a pressure regulator must be higher than the pressure in the pipe system requirements. AMD-1 is used in place of the central company D-2, GEM companies F324 and S460 STAR company pressure maintenance device. Valve type, a Anyuan electromechanical (certification), the valve 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.