One type 江苏兰 valve actuator electric rotary actuator power-driven rotary actuator is the most common and reliable. Single-phase or three-phase motor drive or worm gear final drive stem nut, stem nut produce movement of the valve stem to open or close the valve. Multi-turn electric actuators can quickly drive large valves. In order to protect the valve from damage valve plant, installed at the end of valve travel limit switch will cut off electrical power, but when the safety torque is exceeded, the torque sensing device will be cut off electrical power, the position switch is used to indicate the valve switch state, install clutch device can be manually operated hand wheel valve during a power failure. The main advantage of this type of actuator is that all components are mounted within a housing, in this waterproof, dust-proof enclosure integrates all the basic and advanced features. The main disadvantage is that when a power failure, the valve can remain in place, only the use of standby power systems, valves in order to achieve the fail-safe position (failure to open or fail closed) 江苏兰 valve General Equipment Co., Ltd. which is a coal mine safety certificate and explosion-proof certificate of one of the enterprises. Mine explosion-proof electric valve protection class IP68, suitable for explosive environments Suzhou high pressure valve plant, high safety factor, operating functions, stable performance. Explosion-proof products dI and dIIBT4 two kinds, dI applicable to non-coal mining face; dIIBT4 for factory marine valve plant, suitable for the environment IIA, IIB explosive gas mixtures class T1 ~ T4 group. Valve using pressure from the tight seal or valve, valve cover gasket structure Shanghai Daewoo Valve Factory, trustworthy! Safety and reliability. Valve using intermediate double plate with universal roof structure, can automatically adjust the valves and valve seat sealing surface of the goodness of fit, to ensure the valve seal. At the same time this structure and easy maintenance, cost savings, better valve interchangeability. Valve seat sealing surface welding with cobalt chromium tungsten carbide by a plasma made of high sealing surface hardness, abrasion resistance, scratch resistance, the use of electric switching mechanism. In addition to local operation, but can also be remotely operated, valve manufacturers, electric equipment (certified), valve plant by 江苏兰 valve General Equipment Co. Jiangsu Lan valve General Equipment Co., Ltd. (www.lanfa.cn) Changzhou, Jiangsu, regulating valves leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Jiangsu Lan valve leadership with the staff warmly welcome all inquiries negotiations to create a better future for Jiangsu Lan valve.