(a) A cock or outlet valve of a water-supplying pipe. (b) The outlet valve of a basin, cistern, etc. to which the waste-pipe is attached.

A stop-cock of which the plug is turned to open or close it. Obsolete.

a stopcock for letting air out or in.

Any of various machines or devices; esp. one consisting of a jack or lever enclosed in a box or block… A valve used to allow air trapped in a…

English regional (northern). A washer fitted between the linchpin and nave of a wheel. Obsolete.

a valve which closes a pipe against the passage of fluid.

Having, or connected with, three ways, roads, or channels; situated where three ways meet. Also, involving three participants. three-way cock, three…

(a) a valve opened or closed by the rising or falling of a ball which exactly fits a cup-shaped opening in the seat; (b) = ballcock, n.

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 consisting of a flat end-piece which is lifted in and out of an opening by an axial rod.

a valve that opens and closes by a plunging action.

In full pot-lid valve. A valve having the form of a cap fitting over a hole or the end of a pipe, etc. Also: the cover of the air pump of a steam…

a valve, esp. one in a water pipe, which allows fluid to flow in one direction only and which automatically closes when flow ceases or reverses…

A device, esp. a tap, designed to be operated by being screwed or turned. In later use: spec. a mechanism forming part of a machine for rolling…

an air valve consisting of a flap of mica hinged at the top, used esp. in ventilator ducts and shafts.

A valve. tide flap n. a valve used to shut off the tide-water from a sewer.

a tubular valve.

a tap constructed to turn horizontally on the supply-pipe and thus open or close the valve as required.

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 proprietary term used to designate air valves of a type introduced by Schrader and used esp. on tyres.

a small auxiliary valve that is operated in association with a larger valve.

a valve for regulating the proportions of liquids, gases, etc., in a mixture (see also sense 5d).

a valve in which a shaft with channels in its surface slides inside a sleeve with ports in it, the flow between which depends on the position of…

a valve which serves to allow the escape of surplus fluid.

A device serving as a safety valve; (also) the action of installing or using a safety valve. Also figurative.

= three-way valve at three-way, adj. a.