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Leaking of fluid between a cylinder and its piston during operation.



Related Terms

FREE-PISTON GAGE

An instrument for measuring high fluid pressures in which the pressure is applied to the face of a small piston that can move in a cylinder and the force needed to keep the piston stationary is determined. Also known as piston gage.

INTAKE STROKE

The fluid admission phase or travel of a reciprocating piston and cylinder mechanism as, for example, in an engine, pump, or compressor.

DASHPOT

A device used to dampen and control a motion, in which an attached piston is loosely fitted to move slowly in a cylinder containing oil.

COMPRESSION STROKE

The phase of a positive displacement engine or compressor in which the motion of the piston compresses the fluid trapped in the cylinder.

INLET VALVE

The valve through which a fluid is drawn into the cylinder of a positive-displacement engine, pump, or compressor. Also known as induction valve.

INTEGRATING WATER SAMPLER

A water sampling device comprising a cylinder with a free piston whose movement is regulated by the evacuation of a charge of fresh water.

RECIPROCATING COMPRESSOR

A compressor which uses a piston and cylinder mechanism to provide pumping action. Consist of one or more piston and cylinder combinations. The piston moves in a reciprocating motion to draw the suction gas into the cylinder on one stroke and to compress and discharge it to the condenser on the return stroke.

ACCELERATOR PUMP

A small cylinder and piston controlled by the throttle to provide an enriched air-fuel mixture during acceleration.

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.

PISTON PUMP

A pump in which motion and pressure are applied to the fluid by a reciprocating piston in a cylinder. Also known as reciprocating pump.

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