Valve

Summary

A valve is a device or natural object that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. Valves are technically fittings, but are usually discussed as a separate category. In an open valve, fluid flows in a direction from higher pressure to lower pressure. The word is derived from the Latin valva, the moving part of a door, in turn from volvere, to turn, roll. The simplest, and very ancient, valve is simply a freely hinged flap which swings down to obstruct fluid (gas or liquid) flow in one direction, but is pushed up by the flow itself when the flow is moving in the opposite direction. This is called a check valve, as it prevents or "checks" the flow in one direction. Modern control valves may regulate pressure or flow downstream and operate on sophisticated automation systems. Valves have many uses, including controlling water for irrigation, industrial uses f

Official source

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

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 (8)

Related publications

Related people

Related units

Related concepts (30)

Related concepts

Related courses (34)

La conception générale et l'agencement des différentes infrastructures et batteries hydroélectriques, avec le dimensionnement de leurs ouvrages hydrauliques principaux.

Les aménagements hydrauliques sont indispensable pour garantir l'approvisionnement en énergie écophile et renouvelable, de même que l'approvisionnement en eau de bonne qualité et en quantité suffisante pour lutter contre la faim, la pauvreté et les maladies dans le monde.

Introduction aux phénomènes propagatifs dans les circuits hydrauliques, calculs de coups de béliers, comportement transitoires d'aménagements hydroélectriques, simulation numériques du comportement dynamique de turbines Francis, Pelton et Kaplan, et étude de la stabilité de ces systèmes

Related courses

Related lectures (69)

Related lectures

Multimodal Haptic Device, System, and Method of Using the Same

Tobias Lukas Rolf Bützer, Simon Gallo, Giulio Rognini

A multimodal haptic device operating as a closed-loop system, the device including a pipeline configured to allow a closed-loop flow of a fluid medium, a manifold operatively connected to the pipeline, the manifold having a pump and a valve to control and regulate a flow of the fluid medium along the pipeline, and a display unit operatively connected to the pipeline, the display unit having a tactile display and a valve operatively connected to the tactile display for regulating an efflux of the fluid medium from the tactile display into the pipeline.

2016

Preliminary Study of Pressure Self-Sensing Miniature Magnetorheological Valves

Yoan René Cyrille Civet, Minh Trung Duöng, Kenny Jeanmonod, Sofia Lydia Ntella, Yves Perriard

Magnetorheological (MR) valves have been included in many innovative engineering systems, such as dampers, clutches, or brakes, with different fields of application. Their role serves actuation purposes, while integrated displacement and velocity sensing in the actuators has been studied, as well. In this paper, we present the working principle, design, and preliminary results of a miniature MR valve with pressure self-sensing capabilities that exploits the electromagnetic induction phenomenon. The valve can work in a pressure range from 200 kPa to 700 kPa, supplied by a current of a maximum 0.3 A. The suggested valve design is realized with two coils, one for the current application and the magnetic field creation and one for the sensing of the electromagnetic induction. A specially designed test-bench, that facilitates MR fluid flow and pressure regulation, was used for the experimental procedures.

IEEE2021

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