The advantage of pneumatic valves and pneumatic valves and distinction

Working principle of the pneumatic valve _ pneumatic valves and pneumatic valves and the advantages of difference: pneumatic valve 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 valve in gas plant, chemical industry, oil refining, etc to higher safety requirements have wide application in production. Pneumatic valve of the main advantages: continuous gas signal, the output linear displacement ( After gas/gas conversion device, also can accept continuous gas 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. Pneumatic valve, pneumatic valve 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 advantages of pneumatic actuators is highly stable and user application of constant thrust, zui big actuator that generates the thrust can be as high as 225000 KGF, can achieve only so big thrust hydraulic actuators, but hydraulic actuator pneumatic is much higher than the cost. Pneumatic 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 valve 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.