- V -

Valve Arrangement

The way valves are placed in an engine, such as valves-in-head or valves-in-block.

Valve Body Assembly

An assembly containing the parts that act as the "brain" of an automatic transmission, receiving messages on gear selected, vehicle speed, throttle opening and engine load, then operating automatically by sending fluid to apply the appropriate bands and/or clutches.

Valve Clearance

A term used for valve lash.

Valve Face

The tapered section of the valve head making contact with the valve seat.

Valve Float

1. A valve that does not close completely. 2. A valve that does not close at the proper time.

Valve Guide

The bore in the cylinder head through which the valve stem passes.

Valve Head

A term designating the enlarged end of the valve.

Valve Job

The reconditioning of a cylinder head, including the valves.

Valve Keeper

A small part that fits into the retainer groove located near the tip of the valve stem to secure the valve and valve spring.

Valve Lash

The specified clearance between a valve stem end and a rocker arm on an OHV engine or valve stem end and the camshaft on an OHV engine; necessary to allow for heat expansion.

Valve Lift

Distance that the valve moves from the closed to the open position.

Valve Lifter

A cylindrically shaped hydraulic or mechanical device in the valve train that rides on the camshaft lobe to lift the valve off its seat.

Valve Overlap

The time that the closing of the exhaust valve overlaps the opening of the intake valve at the end of the exhaust stroke and at the beginning of the intake stroke, when the intake and exhaust valves are partially open at the same time depending on the spacing of the lobe centers on the camshaft and the cam's duration.

Valve Plate

A plate containing suction and/or discharge valves located under the compressor heads.

Valve Pocket

An area cut into the top of a piston to provide valve clearance.

Valve Position Sensor

A sensor that relays information, in electronic form, to a process relative to the position of a valve.

Valve Rack

A holder that keeps valves in proper order when removed, to ensure proper reassembly.

Valve Relief

A term used for valve pocket.

Valve Retainer

A term used for valve keeper or valve key.

Valve Rotator

A device that rotates the valve while the engine is running.