Electric valves and pneumatic valves which good? The advantages and disadvantages compared.

the 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.

electric actuators

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advantage

is the height of the stability constant of thrust, and users can be used more 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, is a good way to overcome the medium of 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 valve position signal status ( Keep/open/close) And failure, must remain in situ, the pneumatic actuators cannot, pneumatic actuators must use a set of integrated protection system to achieve the position.

electric actuators

shortcomings

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.

pneumatic valve

the valve pneumatic actuators actuators and regulating mechanism is a unified whole, the executing agency with diaphragm and piston type two kinds. Due to the actuator has a simple structure, export thrust large, action is stable and reliable, and safe explosion-proof, etc, in power plant, chemical industry, oil refining, such as the safety requirements of high production process has a wide range of applications.

actuator

advantage

accept the spirit of continuous signal, 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. Output force related to the operating pressure. High reliability, after air supply interruption after the position control valve can be maintained. Maintenance is simple and good adaptability to environment. The output power is larger. With functions of explosion-proof.

actuator

shortcomings

piston stroke length, suitable for requiring a greater thrust; But diaphragm stroke is small, can only be direct drive valve stem. Movement speed, but the load is increased speed will slow down.

electric valves and pneumatic valves have their advantages and disadvantages, when choose, should undertake choosing according to condition, must not blindly.

keyword: electric valve