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 sensors that monitor changes in such conditions.^[1] A valve is a mechanical device that regulates the flow of fluids (either gases, fluidised solids, slurries or liquids) by opening, closing, or partially obstructing various passageways. ... Fig. ... The use of water pressure - the Captain Cook Memorial Jet in Lake Burley Griffin, Canberra. ... . The initial letter is shown capitalized due to technical restrictions. ... A liquid will usually assume the shape of its container. ... A sensor is a technological device or biological organ that detects, or senses, a signal or physical condition. ...

The opening or closing of control valves is done by means of electrical, hydraulic or pneumatic systems. The article on electrical energy is located elsewhere. ... Hydraulics is a branch of science and engineering concerned with the use of liquids to perform mechanical tasks. ... Pneumatics, from the Greek πνευματικός (pneumatikos, coming from the wind) is the use of pressurized air in science and technology. ...

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

FBFDBDFBDFBDFB FBDFB.BCVBCVB . ... A butterfly valve is a type of flow control device, used to regulate a fluid flowing through a section of pipe. ...

See also

• Control engineering
• Control system
• Instrumentation
• Instrumentation engineering
• Process control

Control engineering is the engineering discipline that focuses on the mathematical modelling systems of a diverse nature, analysing their dynamic behaviour, and using control theory to make a controller that will cause the systems to behave in a desired manner. ... It has been suggested that this article or section be merged with Control theory. ... Instrumentation is defined as the art and science of measurement and control. Instrumentation can be used to refer to the field in which Instrument technicians and engineers work, or it can refer to the available methods of measurement and control and the instruments which facilitate this. ... k ... Process control is an engineering discipline that deals with architectures, mechanisms, and algorithms for controlling the output of a specific process. ...

External links

• 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.

References

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