Invention and Engineering

Double beat valve

The double-beat valve, drop valve or equilibrium valve is a type of poppet valve arranged to allow it to be opened against a high pressure with a minimum of force. One of its uses is in steam engines to admit steam to the cylinders and to release the exhaust. In stationary steam engines it is usually operated by trip valve gear while in railway locomotives a valve gear such as Caprotti is used.

Also on this shelf

See also

• ▸Great Lakes region
• ▸Engwall family
• ▸BR Standard Class 9F 92220 Evening Star

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