The engineer's sketch-book of mechanical movements, devices, appliances, contrivances and details employed in the design and construction of machinery for every purpose

by Thomas Walter Barber

[1664]. Finger valve, closed by a spring.

[1665]. Taper cone valve, for gradually closing an outlet.

[1666]. Dome valve, used for hot blast, hot gases, &c. This form retains its shape when heated, expanding evenly.

[1667]. Common floating ball tap.

[1668]. Three-way air valve.

[1669]. Duplex slide, used to close a number of openings at once.

[1670]. West’s spiral valve, with indiarubber cord which expands and contracts over a spiral perforated groove.

[1671]. Dennis’ self-lifting valve. The valve is kept to its seat by the pressure being admitted on to its back through small hole A; when the larger hole B is opened by the spindle the back pressure is relieved and the valve lifted by the pressure below its conical underside.

[1672]. Common cone plug.