Valves

valve controlling the release of a liquid or gas from a pipe

thumb|These water valves are operated by handle#Twist handles|rotary handles. 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.

valve that acts as a fail-safe

valve that allows fluid to flow through it in only one direction

fitting in piping

quarter-turn valve which uses a hollow, perforated and pivoting ball to control fluid flow

flow control device

electromechanically operated valve

self-contained valve which opens to admit gas to a chamber and automatically closes to prevent the gas from escaping

device used to regulate fluid flow

component of air conditioning and refrigeration systems

device that regulates, directs or controls the flow of a fluid or a gas

valve used to control the rate of flow of a gas or liquid

type of check valve

valve used to automatically control gas flow in lighthouses

water conservation device

type of valve in which the rotation of a passage or passages in a transverse plug regulates the flow of liquid or gas through the attached pipes

device for controlling the flow of beer into a vessel

Subclass of stopcocks

electrically operated valve that controls how hydraulic fluid is sent to an actuator

flow control device

valve whose output line provides a reduced (or increased) pressure

valve used in respiratory medicine

device used for the automation of a valve

valve with a small port and a threaded, needle-shaped plunger

device used to control the motion of a fluid along a tube or pipe by means of the linear motion of a piston within a chamber or cylinder

valve that regulates the flow or pressure of a fluid