Electric pneumatic control valve selection

Electric pneumatic - valve actuators in order to make the choice of electric pneumatic regulator 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, the presence of electric pneumatic regulator will also affect the force movement characteristics, so the force balance needs to be established in the opening range. Determine the type of actuator 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. Role mode selection only have 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 the combination of four electric pneumatic control valve action have both on and off. For the choice of the ways of its role, mainly from three aspects: 1, craft production safety; 2, the characteristics of medium; 3, ensure product quality, the economic loss is minimal.