Explain how the motor motion is transmitted to the valve stem?

Explain how the motor motion is transmitted to the valve stem?  
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1 Answer

Answer :

The motor shaft is connected to a spar gear. It engages on a worm wheel. The worm wheel has dog teeth. This dog teeth engages or hits the dig teeth on moving or sliding clutch. The sliding clutch has splines and these are on the splines of valve stem. So when the sliding clutch rotates the valve also rotates simultaneously. 
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