In this section we will read about
- Current to pressure Converter (I/P Converter)
- Control Valve positioner or Pneumatic positioner
- Parts of a pneumatic control valve positioner
- Control Valve and its types
- Solenoid Valve
- Pneumatic Cylinder
- Butterfly Valve
- Globe Valve or pneumatic globe valve
- Parts of a Control Valve
- Pneumatic globe valve types
- Control Valve Characteristics
- Class of a control valve
- Pressure Transmitter
- pressure transmitter working principle
- Pin type pressure Transmitter
- Pressure Transmitter connections
- pressure transmitter signal checking
- Flow 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 its parts.
The control valve positioner works on the air signal.
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 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).
The travel pin provides a connection between the positioner and a control valve.
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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