Hinged Valves constitute a large class, as for example the butterfly-valve, clack-valves, and other forms in which the leaf or plate of the valve is fastened on one side of the valve seat or opening.
Valve-bracket is a bracket fitted with a valve.
The Valve-chamber is where a pump valve or steam valve operates.
Valve-cock.—A form of cock or faucet which is closed by dropping of a valve on its seat.
Valve-coupling is a pipe coupling containing a valve.
Valve-seat is the surface upon which a valve rests.
Back pressure valves are ball or clack valves in a pipe which instantly assume the seat when a back pressure occurs. They are illustrated in “6,” [Fig. 144]. Their name signifies their use—to maintain a constant back pressure in heating systems.
Ball-valve—a faucet which is opened or closed by means of a ball floating in the water. It constitutes an automatic arrangement for keeping the water at a certain level.
Bib-cock—a faucet having a bent-down nozzle.