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Piston type pneumatic actuator

Piston type pneumatic actuator also has spring and no spring two kinds. The piston in the cylinder moves with the change of the differential pressure between the two sides of the cylinder. The two sides of the piston are respectively the fixed signal (including the atmosphere) and the variable signal, or the dual variable signal. Its output characteristics are proportional and two bit. According to the operation pressure on both sides of the input piston, the piston is pushed from the high pressure side to the low pressure side. The proportional type is a valve positioner added on the basis of the two position type, so that the displacement of the push rod is proportional to the signal pressure.

　　

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