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screw valve
A stopcock opened and closed by means of a screw instead of a spigot.
reversing valves
plural of reversing valve
flapper valves
plural of flapper valve
triple valve
(rail transport) In railway air braking systems, a valve that performs three functions.
triple valves
plural of triple valve
tail valve
snifting valve
tail valves
plural of tail valve
flapper valve
A kind of valve used in toilets, water softeners, etc. to create a watertight seal in the tank that holds water until it needs to be flushed, at which point the valve is raised.
piston valve
A valve which uses a hollow or double piston sliding in a cylinder to direct fluid along one of two paths
retaining valve
(rail transport, mechanical engineering) A device that retains some air pressure in a train's air brake cylinders even when the automatic brake valve is set to the fully-released position, used on steep downgrades to allow a degree of continuous braking effort to be maintained without depleting the pressure in the train's brakepipe (which would result in the loss of nearly all braking ability, causing a runaway).
