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 the parts of a pneumatic control valve positioner.

  • 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 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 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.

The discussion about the gauges of Control valve positioner are 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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