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Difference between revisions of "Control Valves"
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[[Category:Valves]]{{Knoppen}} | [[Category:Valves]]{{Knoppen}} | ||
* | '''Control Valves''' are [[Valves]] used to control conditions such as flow, pressure, temperature, 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. | ||
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* | The opening or closing of control valves is usually done automatically by [[Electrical Actuators]], [[Hydraulic Actuators]]or [[Pneumatic Actuators]]. [[Positioners]] are used to control the opening or closing of the actuator based on electric, or pneumatic signals. These control signals, traditionally based on 3-15psi (0.2-1.0bar), more common now are 4-20mA signals for industry, 0-10V for HVAC systems, and the introduction of Smart systems, HART, Fieldbus Foundation, and Profibus being the more common protocols. | ||
* | A control valve consists of three main parts in which each part exist in several types and designs: | ||
* ------------ | * Valve's actuator | ||
* Valve's positioner | |||
* Valve's body | |||
==Types of control valve bodies== | |||
The most common and versatile types of control valves are sliding-stem globe and [[Angle Valves]]. Their popularity derives from rugged construction and the many options available that make them suitable for a variety of process applications, including severe service.Control valve bodies may be categorized as below: | |||
* 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 | |||
* [[Diaphragm Valves]] | |||
* [[Rotary Valves]] | |||
:* Butterfly valve bodies | |||
:* V-notch ball control valve bodies | |||
:* Eccentric-disk control valve bodies | |||
:* Eccentric-plug control valve bodies | |||
* Sliding cylinder valves | |||
:* Directional control valves | |||
:* Pool valve | |||
:* Piston valves | |||
* Air operated valves | |||
:* Air operated valve | |||
:* Relay valve | |||
:* Air operated pinch valve | |||
==Sources== | |||
[http://en.wikipedia.org/wiki/Control_valves Wikipedia Control valves] | |||