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An oscillating type of valve gear with a trip mechanism for the admission and exhaust of steam to and from an engine cylinder.

Related Terms

CROWN

The top of the piston in an internal combustion engine above the fire ring, exposed to direct flame impingement.

RETURN-STEAM CONDENSATE

That steam produced by a boiler which returns to the boiler after it has condensed.

DEPOSITS

Oil-insoluble materials that result from oxidation and decomposition of lube oil and contamination from external sources and engine blow-by. These can settle out on machine or engine parts. Examples are sludge, varnish, lacquer and carbon.

ADIABATIC EFFICIENCY

The ratio of actual work output of a heat engine to the ideal output.

BYPASS VALVE

A valve mechanism that assures system fluid flow when a preselected differential pressure across is exceeded; the valve allows all or part of the flow to bypass the filter element.

API ENGINE SERVICE CATEGORY

Gasoline and diesel engine oil quality levels established jointly by API, SAE, and ASTM, and sometimes called SAE or API/SAE categories; formerly called API Engine Service Classifications.

SADDLE VALVE

Valve body shaped so it may be silver brazed or clamped onto a refrigerant tubing surface.(TAP-A-LINE)

SERVICE VALVE

Manually operated valve mounted on refrigerating systems used for service operation.

BORE POLISHING

Excessive smoothing of the surface finish of the cylinder bore or cylinder liner in an engine to a mirror-like appearance, resulting in depreciation of ring sealing and oil consumption performance.

POSITIVE CRANKCASE VENTILATION (PCV)

System for removing blow-by gases from the crankcase and returning them through the intake manifold to the combustion chamber where the recirculated hydrocarbons are burned. A PCV valve controls the flow of gases from the crankcase to reduce hydrocarbon emissions.
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