The working principle of electric pneumatic valve positioner

Pneumatic valve positioner is designed according to the force balance principle of work, the working principle of the box, as shown in the above design according to the principle of force balance and it works. As shown as flux into the signal of bellows pressure increases, the lever 2 turn around the fulcrum, dampers near the nozzle, the nozzle back pressure after the amplifier amplification, send into thin film actuator chamber, make the stem moves down, and drive the feedback pole ( Swinging rod) Turn around the fulcrum, feedback connection on the same shaft CAM ( Eccentric CAM) Also as for counterclockwise rotation, through the roller to rotate the lever 1 around the pivot, and will feedback spring tension, tension of lever 2 spring and signal pressure forces acting on the corrugated pipe reaches moment balance instrument to reach equilibrium. At this point, the certain signal with a certain pressure position corresponding to the valve. Above action is positive effect, if you want to change the way we work, as long as will turn CAM, to become A to B, etc. , can. The so-called positive locator, is signal pressure increases, the output pressure also increased; The so-called reaction locator, is signal pressure increases, the output pressure is reduced. A positive role in executing agency as long as the mount reaction locator, can realize reaction actuator movement; Instead, a backlash actuators as long as the mount reaction locator, can achieve positive action of the actuator. Wuxi east the control valve to owner products are: pneumatic actuators, pneumatic ball valves, pneumatic butterfly valve, pneumatic Angle seat valve, pneumatic valve, pneumatic valve, pneumatic feeding valve, pneumatic valve, pneumatic diaphragm valve, pneumatic pipe clamp valve, pneumatic control valve, etc. Various kinds of pneumatic and hydraulic valve actuator, hydraulic valve automation control products, etc. GT pneumatic fluorine-butterfly flanged ball valves to click into the product details & GT; > GT butterfly valve pneumatic PVC click enter product details & GT; > AW pneumatic actuator click enter product details & gt; >