plural of screw valve

A stopcock opened and closed by means of a screw instead of a spigot.

The valve of a reversing cylinder.

plural of reversing valve

plural of triple valve

(rail transport) In railway air braking systems, a valve that performs three functions.

snifting valve

plural of tail valve

plural of 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.