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Control valves

Control valves are valves used within industrial plants and elsewhere to control operating conditions such as temperature, pressure, flow, and liquid level by fully or partially opening or closing in response to signals received from controllers that compare a "setpoint" to a "process variable" whose value is provided by sensors that monitor changes in such conditions.^[1]

Additional recommended knowledge

Recognize and detect the effects of electrostatic charges on your balance

Safe Weighing Range Ensures Accurate Results

Daily Visual Balance Check

The opening or closing of control valves is done by means of electrical, hydraulic or pneumatic systems.

Types of control valve bodies

The different types of control control valve bodies may be categorized as shown below:^[2]

Globe Valves
- Single-Port Valve Bodies
- Balanced-Plug Cage-Style Valve Bodies
- High Capacity, Cage-Guided Valve Bodies
- Port-Guided Single-Port Valve Bodies
- Double-Ported Valve Bodies
- Three-Way Valve Bodies
Rotary Valves
- Butterfly Valve Bodies
- V-Notch Ball Control Valve Bodies
- Eccentric-Disk Control Valve Bodies
- Eccentric-Plug Control Valve Bodies

References

^ Bela G. Liptak (Editor) (2003). Instrument Engineers' Handbook, 4th Edition, CRC Press. 0-8493-1083-0.
^ Fisher Controls International Emerson Process Management website.