Introduces Chinese language relating to pneumatic valve drive device

Introduces Chinese language relating to pneumatic valve drive device. Pneumatic valve actuator is used with open and close valves on the power device. Use drive is designed to make the operation of the valve convenient save Labour, or to realize automatic control and remote control. Basic requirements for the valve actuation device is: torque or need thrust can achieve the valve opening and closing, the stroke and the torque control is accurate, stable and suitable for dynamic selection of site condition, opening and closing action conform to the requirements of the control, light and small device itself. Drive according to the output shaft is divided into many rotary movement way, part of the rotary and linear reciprocating 3 kinds. Rotary rotary is more circle, more suitable for the stem or stem nut need revolving circle in order to fully open or close the valve, part of the rotary is suitable for the stem within a circle in the rotation can be fully open or close the valve, the straight line reciprocating do straight line reciprocating movement is suitable for the stem can be fully open or close the valve. Pneumatic valve actuation device according to the power source can be divided into manual gear, gear, pneumatic device, electric actuator, hydraulic device, gas-liquid linkage, electro-hydraulic linkage and so on. Primitive and simple valve actuator is the handwheel, handle. As the valve large-scale and automation of production process, more and more on the needs of different valve actuator. Pneumatic valve actuator occupies an important position in the industrial production automation.