Reconditioning valves is being discussed. Technician A says the valve is stroked across the stone at the same time it is fed in. Technician B says when the last pass is complete, back the valve out of the stone. Who is correct?

Technician B is correct

Explanation:

It's very important to back the valve out after the last pass is complete to avoid any form of breakage. This is a precautionary measure.

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