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The degree of darkness or lightness of a colour.
A control device that restricts or cuts off the flow of a liquid or gas.
A ball used to create a seal inside a valve.
Collection of valves in one unit that operate a common system (automatic transmission for example).
Bounce of a valve in its seat when closing. Usually occurs as a result of the engine speed being too high or the valve spring losing tension through age or deterioration.
Valve Gear (Train)
The mechanism from a cam to a valve in an engine that transmits the movement of the cam to open the valve.
The tube or sleeve in the cylinder head that locates a valve centrally in its seat. The valve slides in the guide during opening and closing.
The top or disc end of a valve that seals the gases in the cylinder head.
The term applied to valves which remain open after the piston has passed tdc or bdc at the end of a stroke in the four stroke cycle.
The term applied to valves which open before the piston has passed tdc or bdc at the beginning of a stroke in the four stroke cycle.