User:Milton Beychok/Sandbox: Difference between revisions
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'''Control valves''' are [[valve]]s used within industrial plants and elsewhere to control operating conditions such as [[temperature]], [[pressure]], [[flow rate]], 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.<ref>{{cite book|author=Bela G. Liptak (Editor)|title=Instrument Engineers' Handbook|edition=4th Edition|publisher=CRC Press|year=2003|id=0-8493-1083-0}}</ref> | |||
The opening or closing of control valves is done by means of [[electrical]], [[hydraulic]] or [[pneumatic]] systems. | |||
==Types of control valve == | |||
The different types of control valve may be categorized as shown below: | |||
*Conventional Valve | |||
*Severe Service Valve | |||
*Pressure Independent Control Valve | |||
==Types of control valve bodies== | |||
[[Image:Pl_control_valve.GIF|thumb|right|190px|Globe control valve with the pneumatic actuator and smart positioner]] | |||
The different types of control valve bodies may be categorized as shown below:<ref>[http://www.documentation.emersonprocess.com/groups/public/documents/book/cvh99.pdf Fisher Controls International] Emerson Process Management website.</ref> | |||
*[[Angle valve]]s | |||
**Cage-style valve bodies | |||
*[[Angle seat piston valve]]s | |||
*[[Globe valve]]s | |||
**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 valve]]s | |||
**[[Butterfly valve]] bodies | |||
**V-Notch ball control valve bodies | |||
**Eccentric-disk control valve bodies | |||
**Eccentric-plug control valve bodies | |||
==References== | |||
{{reflist}} | |||
==External links== | |||
*''''[http://www.spiraxsarco.com/resources/steam-engineering-tutorials/control-hardware-el-pn-actuation.asp 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 | |||
*[http://www.documentation.emersonprocess.com/groups/public/documents/book/cvh99.pdf Control Valve Handbook (4th Edition)] A complete 297-page online book. | |||
*[http://www.unisanet.unisa.edu.au/Information/100048info/IL8.doc Process Instrumentation (Lecture 8): Control valves] Excellent article from a University of South Australia website. | |||
*[http://www.ccivalve.com Control Components Inc] Excellent website for reference to severe service control Valve. They are a leader in severe service control valve business. | |||
*[http://www.flowcontrol.com/Animation/index.html Valve Animations] An informative series of Flash animations demonstrating conventional and pressure independent control valve operation. | |||
==See also== | |||
*[[Control engineering]] | |||
*[[Control system]] | |||
*[[Instrumentation]] | |||
*[[Instrumentation engineering]] | |||
*[[Process control]] | |||
Revision as of 23:46, 18 August 2008
Control valves are valves used within industrial plants and elsewhere to control operating conditions such as temperature, pressure, flow rate, 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
The different types of control valve may be categorized as shown below:
- Conventional Valve
- Severe Service Valve
- Pressure Independent Control Valve
Types of control valve bodies
The different types of control valve bodies may be categorized as shown below:[2]
- Angle valves
- Cage-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
References
- ↑ Bela G. Liptak (Editor) (2003). Instrument Engineers' Handbook, 4th Edition. CRC Press. 0-8493-1083-0.
- ↑ Fisher Controls International Emerson Process Management website.
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
- Control Valve Handbook (4th Edition) A complete 297-page online book.
- Process Instrumentation (Lecture 8): Control valves Excellent article from a University of South Australia website.
- Control Components Inc Excellent website for reference to severe service control Valve. They are a leader in severe service control valve business.
- Valve Animations An informative series of Flash animations demonstrating conventional and pressure independent control valve operation.