Valve actuator

Summary

A valve actuator is the mechanism for opening and closing a valve. Manually operated valves require someone in attendance to adjust them using a direct or geared mechanism attached to the valve stem. Power-operated actuators, using gas pressure, hydraulic pressure or electricity, allow a valve to be adjusted remotely, or allow rapid operation of large valves. Power-operated valve actuators may be the final elements of an automatic control loop which automatically regulates some flow, level or other process. Actuators may be only to open and close the valve, or may allow intermediate positioning; some valve actuators include switches or other ways to remotely indicate the position of the valve. Used for the automation of industrial valves, actuators can be found in all kinds of process plants. They are used in waste water treatment plants, power plants, refineries, mining and nuclear processes, food factories, and pipelines. Valve actuators play a major part in automating process co

Official source

https://en.wikipedia.org/wiki/Valve_actuator

About this result

This page is automatically generated and may contain information that is not correct, complete, up-to-date, or relevant to your search query. The same applies to every other page on this website. Please make sure to verify the information with EPFL's official sources.

Related publications (6)

Related publications

Related people

Related units

Related concepts (1)

Related concepts

Related courses (1)

This course provides an integrated approach to analyzing human indoor thermal comfort by examining the correlation between human thermoregulation, heat exchange with the indoor environment, overall and local thermal sensation of occupants.

Related courses

Related lectures (1)

Related lectures

Actuator, valve actuator unit and valve

Fabio Beco Albuquerque, Herbert Shea

An actuator (22) comprises at least one actuator body (32) of dielectric elastomeric material and two electrodes (34, 36) being attached to opposite surfaces of the actuator body (32), respectively. At least one of the actuator body (32) and at least one of the electrodes (34, 36) is at least partly covered at its outer side with a protective layer (38a, 38b) of polymer material, wherein a mechanical stiffness of the protective layer (38a, 38b) is at least three times lower than a mechanical stiffness of the actuator body (32). Moreover, a valve actuator unit comprises such an actuator (22) and a housing, wherein the actuator (22) is arranged within the housing and the remainder of the housing is filled with a gas. Additionally, a valve comprises such a valve actuator unit and a valve element, wherein the valve element is movable by the valve actuator unit.

2022

Sensorless position detection of a linear actuator using the resonance frequency

Joël Maridor, Yves Perriard

This paper presents a method to detect the position of a linear actuator without any position sensor. The actuator winding has a resonance frequency that is very related to the position of the linear actuator Pmoving part. A sinusoidal scan voltage is superposed to the main voltage. Its frequency is close to the resonance frequency and therefore it is possible to measure the resulting scan current amplitude that allows position detection.

2009

Sensorless position detection of a linear actuator using the resonance frequency

Nikola Katic, Joël Maridor, Yves Perriard

This paper presents a method to detect the position of a linear actuator without any position sensor. The actuator winding has a resonance frequency that is very related to the position of the linear actuator moving part. A sinusoidal scan voltage is superposed to the main voltage. Its frequency is close to the resonance frequency and therefore it is possible to measure the resulting scan current amplitude that allows position detection.

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2009