poppet valve


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poppet valve

[′päp·ət ‚valv]
(mechanical engineering)
A cam-operated or spring-loaded reciprocating-engine mushroom-type valve used for control of admission and exhaust of working fluid; the direction of movement is at right angles to the plane of its seat.

poppet valve

poppet valve
A mushroom-shaped valve in reciprocating engines for controlling the flow of gas in and out of cylinders. The valves are pushed open by cams on a rotating camshaft and closed by strong springs. In aircraft engines, the valves are generally located on the top of the cylinders.
References in periodicals archive ?
This opening of the poppet valve causes part of the coolant flow from the engine outlet to be taken through this radiator branch and enter the thermostat assembly.
These quantities were measured experimentally for different poppet valve configurations.
Chances are it will have ball valves where previous models had gate, butterfly, or poppet valves.
Dick Fleming offers assembly and set-up instructions, a list of parts you can buy locally, and various sizes and styles of check and poppet valves, for prices ranging from $56-$82.
This, Lotus Engineering said, enables control of the timing and lift displacement of the engine poppet valves for each individual crankshaft degree of rotation.
But the holes for the internal flow path in the proprietary fixed poppet valve that was tested were too small, restricting flow.
Gasoline powered Poppet Valve Engines are only 22% to 24% fuel efficient.
The elimination of poppet valves has also eliminated the need for frequent oil changes, cam followers and camshafts, push rods, valve springs and the lubrication oil from the valve system, which dramatically extends the intervals of engine oil changes.
The Coates rotary valves successfully replace the current complex poppet valve train, providing a clear flow area when open and an effective seal when closed.
In fact, we were informed that standard poppet valve engines were only lasting approximately a couple of weeks out in the field when running on natural gaseous fuels.
In contrast to the spherical rotary valve, the poppet valve resembles a golf tee and is driven by linkages connecting it to the engine camshaft.
The CSRV system replaces the standard poppet valve system including springs, valves, gears, camshafts, pushrods, cam followers, and oil with only two moving parts, that run on ceramic bearings.