the difference between pneumatic control valve and electric control valve and choose

pneumatic control valve with compressed air as power source, pneumatic actuators, and electric control valve is made up by electric actuators and valve connection. It is not difficult to see the pneumatic control valve and the choice of electric valve actuators are differences. Down in the face of pneumatic control valve and electric control valve on the power, use, maintenance, and other aspects were compared.

pneumatic - valve:

valve pneumatic actuators actuators and regulating mechanism is a unified whole, the actuators are pneumatic diaphragm and pneumatic piston type two kinds. Piston stroke length, suitable for a greater thrust required; And pneumatic diaphragm stroke is lesser, can direct drive valve stem. Due to the actuator has a simple structure, export thrust large, action is stable and reliable, and safe explosion-proof, pneumatic control Industrial Valves in power plants, chemical industry, oil refining, such as the safety requirements of high production process has a wide range of applications. Pneumatic control valve of the main advantages: continuous gas signal, the output linear displacement ( After add electricity/gas conversion device, also can accept the continuous electrical signal) , some with rocker arm, but the output angular displacement. Have a positive, the reaction function. Movement speed, but the load is increased speed will slow down. Output force related to the operating pressure. High reliability, but after air break valve cannot keep ( After the position control valve can keep) 。 Inconvenience to implement piecewise control and program control. Maintenance is simple and good adaptability to environment. The output power is larger. With functions of explosion-proof. Electric control valve:

electric valve electric actuator is mainly used in power plant or nuclear power plants, because in the high pressure water system needs a smooth, stable and slow process. The main advantage of electric actuators is a high degree of stability and the user can be used of constant thrust, maximum actuators that generates the thrust can be as high as 225000 KGF, can achieve only so big thrust hydraulic actuators, but the cost is higher than the electric hydraulic actuators. Electric actuator deviates from the resistance is very good, the output of the thrust or torque is basically constant and can be very good to overcome the medium unbalanced force, to achieve accurate control of process parameters, so the control accuracy is higher than pneumatic actuators. If with servo amplifier, can easily achieve positive and negative role reversal, also can easily set off Industrial Valves position signal status ( Keep/open/close) And failure, must remain in situ, which is less than pneumatic actuators, pneumatic actuators must use a set of integrated protection system to achieve the position. Electric control valve faults mainly include: structure is complex, are more likely to happen malfunction, and because of its complexity, the technical requirements of maintenance personnel on the spot is relatively high; Motor running to generate heat, if the regulation is too frequent, easily cause motor overheating, thermal protection, it will also increase the wear reduction gear; Another is running slowly, from the regulator output a signal, the response and the regulator movement to the corresponding position, need a long time, this is not as good as pneumatic, hydraulic actuator.

the late operation and maintenance cost of electric control valve pneumatic is much higher.

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