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A steam engine in which the steam exhausts from the cylinder to a vacuum space, where the steam is liquefied.



Related Terms

BOILER

A closed vessel in which water is heated, steam is generated, steam is superheated, or any combination thereof, under pressure or vacuum by the application of heat from combustible fuels, electricity, or nuclear energy. The term dose not include such facilities of an integral part of a continuous processing unit but does include fired units of heating or vaporizing liquids other than water where these units are separate from processing systems and are complete within themselves.

CUTOFF VALVE

A valve used to stop the flow of steam to the cylinder of a steam engine.

OVERHEAD-VALVE ENGINE

A fourstroke-cycle internal combustion engine having its valves located in the cylinder head, operated by pushrods that actuate rocker arms. Abbreviated OHV engine. Also known as valve-in-head engine.

PISTON VALVE

A cylindrical type of steam engine slide valve for admission and exhaust of steam.

COMPRESSION IGNITION

Ignition produced by compression of the air in a cylinder of an internal combustion engine before fuel is admitted.

MERCER ENGINE

A revolving-block engine in which two opposing pistons operate in a single cylinder with two rollers attached to each piston; intake ports are uncovered when the pistons are closest together, and exhaust ports are uncovered when they are farthest apart.

FUEL KNOCK

A hammer like noise produced when fuel is not burned properly in an engine cylinder.

GLAND-SEALING STEAM

It is the low-pressure steam that is led to a sealing gland. The steam seals the gland, which may be either a carbon ring or labyrinth type against air at the vacuum end of the shaft.

OPTICAL INDICATOR

An instrument which makes a plot of pressure in the cylinder of an engine as a function of piston (or volume) displacement, making use of magnification by optical systems and photographic recording; for example, the small motion of a pressure diaphragm may be transmitted to a mirror to deflect a beam of light.

EXHAUST VALVE

The valve on a cylinder in an internal combustion engine which controls the discharge of spent gas.

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