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Control Valves

Control Valves

At Shelley Automation we offer a wide range of control valves from many manufacturers including: Norgren; Aventics; Rexroth; Bosch; CKD; EM C; Mindman; Kelm; Kuhnke; Numatics; Burkert; Airtac; Fluidtec
Herion; Ross; Mac; A.Z.

Control valves are essentially specialized valves used to regulate fluid flow within a system by opening or closing a passageway. They are crucial components in various industrial processes where precise control of flow rate is necessary. This flow rate control can directly influence other process variables like pressure, temperature, and liquid level.
 
Here's a breakdown of a control valve:
Valve Body: The housing that contains the internal components like the plug or seat,
and the connection points for the inlet and outlet flow.
Valve Actuator: This mechanism translates an external control signal (electrical, pneumatic, hydraulic) into mechanical force to move the valve's modulating element. There are various types of actuators, with pneumatic actuators being the most common.
Valve Positioner: Improves the accuracy of the valve's positioning by overcoming friction and wear.
Modulating Element: This is the part within the valve body that opens or closes to control the flow rate.
 
There are various types of modulating elements, with some of the most common being:

  • Globe valves: These have a S-shaped flow path that provides good controllability over a wide range of flow rates.
  • Butterfly valves: These have a disc-shaped rotatable plate for flow control. They are generally used for on/off or throttling applications.
  • Ball valves: These have a hollow ball with a bore that allows flow when aligned with the pipeline and restricts flow when rotated perpendicular to it. Ball valves are generally used for on/off applications but some can be used for throttling.

 
The selection of a control valve depends on various factors such as:
Desired flow control characteristics
Pressure and temperature ratings
Fluid type (gas, liquid, slurry etc)
Pipe size
Actuation type (pneumatic, hydraulic, electric etc)
 
Control valves play a vital role in numerous applications across various industries including:

  • Chemical Processing
  • Oil and Gas Production
  • Power Generation
  • Water Treatment
  • Food and Beverage Manufacturing
  • HVAC Systems