Piston valves are one form of valve used to control the flow of steam within a steam engine or locomotive. They control the admission of steam into the...

one or more pistons. Each piston is inside a cylinder, into which a gas is introduced, either already under pressure (e.g. steam engine), or heated inside...

of piston valves are: The valves used in many brass instruments The valves used in pneumatic cannons The valves used in many stationary steam engines and...

poppet valves and in a steam engine they are usually slide valves or piston valves. In four-stroke cycle engines and some two-stroke cycle engines, the...

piston into the cylinder. It was historically significant as the first practical device to harness steam to produce mechanical work. Newcomen engines...

superseded by piston valves, particularly in engines using superheated steam. There were two reasons for this: With piston valves, the steam passages can...

away from the hot valve head to the stem where it may be conducted to the cylinder head. Common in second world war piston engines, now only found in...

The valve gear of a steam engine is the mechanism that operates the inlet and exhaust valves to admit steam into the cylinder and allow exhaust steam to...

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 piston...

crankshaft to the piston for the purpose of compressing or ejecting the fluid in the cylinder. In some engines, the piston also acts as a valve by covering...

A Corliss steam engine (or Corliss engine) is a steam engine, fitted with rotary valves and with variable valve timing patented in 1849, invented by and...

successful engine using the principle of the piston and cylinder, which was the fundamental type of steam engine used until the early 20th century. The steam engine...

of 18th century) that requires no valve gear. Instead the cylinder rocks, or oscillates, as the crank moves the piston, pivoting in the mounting trunnion...

engine pulled the piston to the top of the cylinder as steam was introduced. Then the cylinder was cooled by a spray of water, which caused the steam...

steam at boiler pressure above the piston and the vacuum below it drives the piston down. Part way down the stroke, the pressurized steam inlet valve...

In a piston engine, a piston rod joins a piston to the crosshead and thus to the connecting rod that drives the crankshaft or (for steam locomotives)...

steam engine is made pressure-tight with end covers and a piston; a valve distributes the steam to the ends of the cylinder. Cylinders were cast in cast...

The Caprotti valve gear is a type of steam engine valve gear invented in the early 1920s by Italian architect and engineer Arturo Caprotti. It uses camshafts...

The sleeve valve is a type of valve mechanism for piston engines, distinct from the usual poppet valve. Sleeve valve engines saw use in a number of pre–World...

improved over the engine operating range. Piston engines normally use valves which are driven by camshafts. The cams open (lift) the valves for a certain...

walls is reduced. Steam entry is usually controlled by poppet valves (which act similarly to those used in internal combustion engines) that are operated...

Steam Machine is a discontinued series of small form factor gaming computers by Valve, designed to operate SteamOS to provide a game console-like experience...

The Walschaerts valve gear is a type of valve gear used to regulate the flow of steam to the pistons in steam locomotives, invented by Belgian railway...

engines, or may refer to the piston or turbine machinery alone, as in the beam engine and stationary steam engine. As noted, steam-driven devices such as the...

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

An overhead valve (OHV) engine, sometimes called a pushrod engine, is a piston engine whose valves are located in the cylinder head above the combustion...

strokes, giving six piston movements per cycle. The second piston may be used to replace the valve mechanism of a conventional engine, which may reduce...

In a steam engine, cutoff is the point in the piston stroke at which the inlet valve is closed. On a steam locomotive, the cutoff is controlled by the...

A four-stroke (also four-cycle) engine is an internal combustion (IC) engine in which the piston completes four separate strokes while turning the crankshaft...

piston engines, along with variants, such as the six-stroke piston engine and the Wankel rotary engine. A second class of internal combustion engines...