A device for controlling the passage of fluid through a pipe or duct, especially an automatic device allowing movement in one direction only
= needle valve.
(In a steam engine) a spring-loaded safety valve designed to open or close very rapidly at a predetermined pressure.
A mechanical valve resembling an acorn.
An automatic valve.
A valve in which a curved cover lies over an outlet in such a way that steam or other fluid can enter the outlet only when this cover is raised above its seat.
A valve consisting of a disc that is moved back and forth against a flat seat or rotated about a diameter in a tube to open and close it.
A valve which can be opened to allow water to escape from a part of a pipe, pump, etc., where it is liable to freeze.
(Originally) a valve enclosed in a spherical chamber or having a spherical body; (in later use) one in which fluid flow is controlled by a movable spindle that can be raised or lowered over a fixed seat.
A thermionic valve or tube with a hard vacuum, or evacuated sufficiently for any remaining gas not to affect its performance.
A valve at the upper end or inlet of a pump, pipe, etc.
Each of the structures occupying the openings of the ventricles of the heart, consisting of two or three membranous cusps, and acting to prevent backflow of blood during and after ventricular contraction.
A valve for regulating the proportions of liquids, gases, etc., in a mixture.
A small auxiliary valve that is operated in association with a larger valve.
A valve containing a pierced or perforated plug which is rotated in order to control flow through the valve.
Electronics a thermionic valve designed to deliver a relatively high power.
A fluid valve in which the main flow is controlled by a diaphragm which is opened and closed by a weep derived from the main flow.
A one-way valve that is opened and closed by pressure on a ball which fits into a cup-shaped opening
A valve that closes to prevent backward flow of liquid
A valve opened and closed by a plate hinged at one side
A ball valve
A one-way valve at the inlet of a pipe or the base of a suction pump
A valve with a sliding part that controls the extent of the aperture
A stopcock opened and shut by a screw
A valve in an internal-combustion engine mounted alongside the cylinder
A piece that opens and closes an aperture by sliding across it
A valve used to stop the flow of liquid in a pipe
The mechanism that controls the opening and closing of the cylinder valves in a steam engine or internal-combustion engine
The part of a vertically opening valve that is lifted off the valve aperture to open the valve
= mixer valve.
A valve in a piston, as in that of a piston pump.
A valve that opens and closes by a plunging action.
A valve that operates in connection with the priming of a pump.
A valve, especially one in a water pipe, which allows fluid to flow in one direction only and which automatically closes when flow ceases or reverses; also called check valve.
A valve serving to relieve pressure in a system when it becomes too high by opening to allow the escape of gas, water, steam, etc.
A valve on a balloon or airship in the form of a ripping panel.
The valve between the left atrium and the left ventricle of the heart, which has two tapered cusps
A valve closed by a thin tapering part
A valve that controls the escape of fluid or gas from a pipe, channel, or duct
A valve that opens automatically to relieve excessive pressure
A valve in the form of a cylinder which slides to cover and uncover an inlet or outlet
A valve on a steam engine that allows air in or out
A multi-electrode valve.
A lift valve whose moving element somewhat resembles a mushroom in shape.
A valve in an internal-combustion engine which has its seat in the top of the combustion chamber, in the surface opposite the piston.
The valve of the heart at the entrance to the pulmonary artery.
Mechanics a valve situated at the point at which water or other fluid enters a vessel or chamber.
A valve serving to reduce and thereby regulate pressure in a steam engine, compressed air line, etc.
A valve controlling the supply of something, especially air.
Another term for mitral valve.