Pneumatic control valve actuator is introduced

In order to make the pneumatic - valve to work properly, with the implementation of the mechanism to produce enough output force to guarantee high sealing and opening of the valve. For double-acting pneumatic, hydraulic, electric actuators, are generally not reset spring. The size of the force has nothing to do with its direction, therefore, the selection of the actuator is the key to find out the biggest output force and rotational torque of the motor. For single acting pneumatic actuators, the output power is associated with the opening of the valve, pneumatic control valve on the emergence of the force will also affect the movement characteristics, therefore needs to be established in the pneumatic - valve opening range force balance. On the actuator output force is determined, according to the process using the environment requirements, choose the corresponding actuator. For the scene have explosion-proof requirements, should choose pneumatic actuators. From the aspects of energy saving consideration, should try to choose electric actuators. If the adjustment of high precision, can choose hydraulic actuators. Such as power plants transparent machine speed regulation, the refinery catalytic unit reactor temperature regulation control and so on. The role of the pneumatic control valve way only when choosing pneumatic actuators, the role of way through positive and negative effect and positive effect of the valve actuator portfolio formation. There are four that are positive (combination Gas closed type) , positive and negative, Gas type) And anyway, Gas type) And reflect ( Gas closed type) , through these four combination way have the function of pneumatic control valve open and close two kinds. For the choice of the ways of pneumatic control valve function, mainly from three aspects: a) Process safety; b） The characteristics of medium; c) Ensure product quality and economic loss is minimal.