Valve air filter pressure reducer principle

Pneumatic valve positioner is designed according to the principle of balance of work, and its working principle box shown above, it is designed according to the principle of balance and work. When the signal into the bellows pressure increases, the lever 2 around the fulcrum rotation, the baffle close to the nozzle, the nozzle back pressure amplified by the amplifier, the film into the actuator chamber, the valve stem down, and drive the lever (Pendulum) rotates around the fulcrum, and the feedback cam (eccentric cam) connected on the same axis also rotates counterclockwise. Through the roller, the lever 1 rotates about the fulcrum, and the feedback spring is stretched. The pulling force of the spring on the lever 2 And the signal pressure on the bellows to reach the torque balance torque instrument to balance. At this point, a certain signal pressure and a certain position on the valve corresponding. The above mode of action is a positive role, to change the mode of action, as long as the cam flip, A to B and so on, you can. The so-called positive positioner, is the signal pressure increases, the output pressure also increases; the so-called reaction positioner, is the signal pressure increases, the output pressure is reduced. A positive acting actuator can act as a reactionary actuator as long as it is equipped with a reaction positioner. On the contrary, a reactionary actuator can act as a positive actuator as long as the reactionary actuator is installed

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