Pneumatic Control Pinch Valve
Actuator
Mounting Bracket
Body Top
Pinching Mechanism
Sleeve
Body Bottom
Stroke Adjuster
Body The body acts as a housing and support for the other valve components. It is not the primary pressure containing component.
Sleeve The sleeve is the primary pressure containing component and is the only component in contact with the process fluid.
Mechanism In sizes 3" and under, the pinching mechanism consists of a top pinch bar connected to a sliding stem. In sizes 4" and over, the pinching mechanism consists of a top pinch bar connected to a sliding stem and a bottom pinch bar guided and supported by side rails.
Pneumatic Actuator The pneumatic actuator contains a piston which is connected to a piston rod, which is used to operate the valve. Double acting actuators do not contain a spring. Fail closed and fail open actuators contain a spring to return the piston to the end of the stroke when all air pressure is removed.
Accessories
Positioner For modulating applications, the valve is supplied with a positioner that accepts the standard ISA input signals of 4-20 mA or 3-15 psi.
Filter/Regulator The filter/regulator provides clean air at a constant pressure to the positioner and/or actuator, provided the plant air supply pressure does not fall below the regulator set point.
Limit Switches Limit switches are supplied where required to indicate the valve is open or the valve is closed.
Solenoid Valves Solenoid valves are supplied for on-off applications to control the valve from a remote location.
Handwheel Override A handwheel override is supplied when it is necessary to open or close the valve if the control system signal or plant air supply is lost.
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