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While pneumatic positioners and analog I/P positioners provide basic valve position control, digital valve controllers add another dimension to positioner capabilities. This type of positioner is a microprocessor-based instrument. The microprocessor enables diagnostics and two-way communication to simplify setup and troubleshooting.
However they are still used extensively for field devices such as control valve positioners, and I to P and P to I converters. A proportional controller schematic is shown here. The set point is transmitted through the flapper plate via the fulcrum to close the orifice and increase the chamber pressure.
The blue valve body is visible in-line with the pipe. The valve actuator opens or closes the butterfly disc of the valve based on electrical signals sent to the actuator. Another valve actuator is visible in the background, with windows to indicate the valve position. A valve actuator is the mechanism for opening and closing a valve. Manually ...
[citation needed] However, realization was first possible in the 1920s, when mercury-arc valve rectifiers with control grids became available. Because of the limitations of mercury-arc valves this method of voltage regulation was not common at the time. It became widespread with the invention of solid-state thyristors at the end of the 1950s.
A TRIAC (triode for alternating current; also bidirectional triode thyristor or bilateral triode thyristor [1]) ...
An actuator can be just a mechanism that is directly driven by the motions or forces of other parts of the system. An example is the camshafts that drive the intake and exhaust valves in internal combustion engines, driven by the engine itself.
A modern electronic "smart" valve positioner is shown, which will incorporate its own PID controller. Most modern PID controls in industry are implemented as computer software in DCSs, programmable logic controllers (PLCs), or discrete compact controllers.
Specific example of a smart valve positioner used. Process plants consist of hundreds, or even thousands, of control loops all networked together to produce a product to be offered for sale. Each of these control loops is designed to keep some important process variable, such as pressure, flow, level, or temperature, within a required operating ...
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