Control valves

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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]

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

1 Types of control valve
2 Types of control valve bodies
3 See also
4 References
5 External links

[edit] Types of control valve

The different types of control valve may be categorized as shown below:

- Conventional Valve
- Severe Service Valve

[edit] Types of control valve bodies

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

Globe control valve with the pneumatic actuator and smart positioner

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

[edit] See also

[edit] References

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

[edit] External links

'Control Valve Tutorials A number of tutorials covering the sizing, capacity and characteristics of control valves. Actuators, positioners, controllers and sensors are also discussed - Spirax Sarco