This video consist about Lapping Valve,
At the first step we must clean the seat and disc with thinner A until there is no a piece of steel or another the same.
The second step give the disc a molycote pasta, at this step don't give it too much
third step is contacting seat and disc and give a little bit push from the handle valve
At the last release the disc and seat, clean the seat with thinner A and watch the scratch an the disc
If its still there a scratch do it again back to the first step
but if there is not, so we can assembly globe valve
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