Control valve
Control valves are valves used mainly within industrial plants 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]
The opening or closing of control valves is done by means of electrical, hydraulic or pneumatic systems.
Types of control valve
Control valves may be categorized as below:
- Conventional valve
- Severe service valve
- Pressure independent control valve
Types of control valve bodies
Control valve bodies may be categorized as below:[2]
- Angle valves
- Cage-style valve bodies
- DiskStack style valve bodies
- Angle seat piston valves
- 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
See also
- Control engineering
- Control system
- Instrumentation
- Instrumentation engineering
- Pneumatic flow control
- Process control
References
External links
- 'Control valve tutorials Tutorials covering the sizing, capacity and characteristics of control valves. Actuators, positioners, controllers and sensors are also discussed - Spirax Sarco
- Control Valve Handbook (4th Edition) A 297-page online book.
- Process Instrumentation (Lecture 8): Control valves Article from a University of South Australia website.
- Control Components Inc Website for severe service control valve.
- Valve Animations Flash animations demonstrating conventional and pressure independent control valve operation.
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