Bash valve
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A bash valve is a valve within a piston engine, used to control the admission of the working fluid. They are directly actuated valves, operated by contact between the piston and the valve tip.
Pneumatic rock drill, with a bash valve above the working cylinder
Valve chest, arc valve and tappet of a pneumatic rock drill
Uniflow steam engine
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The uniflow type of steam engine uses steam that flows in one direction only in each half of the cylinder. Thermal efficiency is increased by having a temperature gradient along the cylinder. Steam al
Bash valve
…it, with nothing to close it. Bash valves are not widely used in steam engines, although they are known. Most examples were applied to some form of uniflow steam engine; unlike the more common slide and piston-valved engines with their bidirectional-flow ports, uniflow engines use inlet ports at the cylinder ends and…
Galloway uniflow steam engine, now in Thinktank, Birmingham Science Museum
A restored 1918 Atkinson Uniflow steam wagon, photographed in 1977