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Ball Valve Function Classification

1, by-pass valve, ball valve, generally for hydrostatic open, so set a by-pass valve flat first, that is filled with water on both sides;

2, air valve, water filling, exclude air taking buoy to close the valve; Drainage, supply air with, float to fall;

3, the pressure relief valve: open shutoff valve, eliminate between valve and plug the pressure of the water, so as not to wear sealing cover;

4, drain valve, discharge a sewage at the bottom of the ball inside the shell.