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u mean valve of a engine.....? here's the answer... when the crankshaft rotates,then with the help of timing gear the camshaft rotates.timing gears are the gears on crankshaft(pinion) and camshaft(gear). when the cams on the crankshaft rotates it lifts up the follower(during eccentric portion of the cam). follower is connected to a push rod which moves the rocker about a point. rocker presses the valve stem in avalve guide againt the spring pressure. the valve comes down from the valve seat. and our fuel air mixture rushes inside the cylnder. when the non eccentric portion of the cam on the camshaft comes valve stem moves up due to spring pressure. the timing gears are such that they maintain a speed ratio of two between them. it means camshaft has to rotate at half the speed of crankshaft. it is because a valve has to open and close once in every two revolutions of the crankshaft.
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How does a four way hydraulic valve work with a power beyond port?
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blah
How does a 2 way manifold valve work?
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They got it to work on a bike...
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