Instrumentation

Parts of a pneumatic control valve positioner

In this lesson, we will study  Parts of a pneumatic control valve positioner.

As Discussed before Pneumatic control valve positioner works as an actuator to the control valve.

Now we will discuss its parts.

The control valve positioner works on the air signal.

  • Adjuster

an adjuster is used to adjusting the position of a control valve if the control valve is not fully closed or opened after giving a signal it can be closed or opened by adjuster screw.

Cam

Cam is used to operating a pneumatic control valve. Cam is also used to make control valve either air to open (Normally Closed) or air to close (Normally open).

Bypass Switch Assembly

Bypass Switch Assembly has 2 positions

  1. Positioner.
  2. Bypass.

In the bypass position control valve operation is only closed or opened. % opening is not performed in a bypass position.

In Positioner position % opening is performed. In this type of opening, the Control valve works according to the signal of the PID Controller or Current to Pressure Converter (I/P Converter).

Travel pin

The travel pin provides a connection between the positioner and a control valve.

pneumatic control valve positioner
pneumatic control valve positioner

The discussion about the gauges of the Control valve positioner is also discussed in the previous lesson.

The control valve positioner also comes with an in-built current to pressure converter ( I/P Converter). The figure is shown below

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