Instrumentation

Globe Valve or pneumatic globe valve

In this lesson, we will study the globe valve or pneumatic globe valve .

  • A globe valve is a type of valve used for regulating flow in a pipeline, consisting of a movable disk-type element and a stationary ring seat in a generally spherical body.
  • The pneumatic globe valve is the most commonly used control valve in industries. Globe valves are available in different sizes. The Globe valve is used on water and steam lines both. Globe Valve is used where pressure is high.
  • Control Valve has 2 parts.
    1. Actuator.
    2. Body.
pneumatic globe valve or control valve
control valve

Parts of actuator

Diaphragm

O- Ring

Spring

Wheel

 The actuator is connected to the body through a coupler.

Parts of Body

 Plug

Plug stem (Spindle).

Balancing Ring

Seat

Cage

Valve position indicator.

Gland

Chuck- Nut

Bonnet

  • Control valves are valves to control conditions such as flow, pressure, temperature, and liquid level by partially or fully opening or closing in response to signals received from controllers.
  • The controller compares a “Set-point ” to a “Process variable”, the value of this process variable is provided by sensors that monitor changes in such conditions (flow, pressure, temperature, and liquid level ).
  • The difference between Setpoint and the process variable is known as error.
  • Controller minimizes this error in various parameters like- flow, pressure, temperature, level, etc by the use of control valves.
  • In the next lesson, we will discuss the Work of different parts of a Control Valve.

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