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Valve gear opens and closes valves in the correct order. In rotating engines valve timings can be driven by eccentrics or cranks, but in non-rotative beam...

applications. This also requires some unusual valve gear, see Cornish engine valve gear.[citation needed] The Cornish cycle operates as follows. Starting from...

access and not visited in normal operation. The valve gear (or 'working gear') of a Newcomen or Cornish engine is based on the plug rod. This is a vertical...

Gab valve gear was an early form of valve gear used on steam engines. Its simplest form allowed an engine to be stopped and started. A double form, mostly...

An expansion valve is a device in steam engine valve gear that improves engine efficiency. It operates by closing off the supply of steam early, before...

The Cornish valve gear, as used on early beam engines, was invented by Murdock, an assistant of James Watt, in 1820. Double-beat poppet valves became...

by valve gear, of which there are many types. The simplest valve gears give events of fixed length during the engine cycle and often make the engine rotate...

the slide valve, which typically used 10% of an engine's power. Corliss used automatic variable cut off. The valve gear controlled engine speed by using...

valve gear in the 1715 Newcomen engine, an early form of steam engine. Early versions of the Newcomen engines from 1712 had manually operated valves,...

fast-acting valves. Corliss engines are distinguished by special rotary valve gear. Uniflow engines have admission valves at the cylinder heads and exhaust...

(157 cu in) overhead valve W6 engine, with three banks of paired cylinders, all working on a common crankshaft. The sole W8 engine to reach production...

A safety valve is a valve that acts as a fail-safe. An example of safety valve is a pressure relief valve (PRV), which automatically releases a substance...

form of valve gear) was very likely established practice before 1715, and is clearly depicted in the earliest known images of Newcomen engines by Henry...

valve gear was cutting-in at the wrong position in the stroke, not allowing for expansive working in the cylinder. Successful Woolf compound engines were...

Murdoch also made innovations to the steam engine, including the sun and planet gear and D slide valve. He invented the steam gun and the pneumatic...

1781, this technique was first employed on a Cornish beam engine in 1804. Around 1850, compound engines were first introduced into Lancashire textile...

Prosper. This became known as the Cornish engine, and was the most efficient in the world at that time. Other Cornish engineers contributed to its development...

brought about by the engine's unique valves and valve gears. Unlike most engines employed during the era that used mainly slide-valve gears, Corliss created...

piston when all the valves are shut and it is compressing any remaining steam. Water can be introduced from the boiler or in a cold engine, steam will condense...

head. Lenoir's steam engine-derived cylinder was inadequate for the petrol engine and so a new design, based around poppet valves and a single-acting trunk...