In this section we will read about
- I/P Converter (Current to pressure Converter)
- Valve positioner
- Parts of a pneumatic control valve positioner
- Control Valve and its types
- Solenoid Valve
- Pneumatic Cylinder
- Butterfly Valve
- Pneumatic Globe Valve
- Work of different Parts of a Control Valve
- Pneumatic globe valve types
- Characteristics of Control Valve
- Class of a control valve
- Pressure Transmitter
- Working principle of pressure transmitter
- Pin type pressure Transmitter
- Connections of a pressure transmitter
- How signal is checked in a pressure transmitter
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.
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 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
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).
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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