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Reliable stem sealing and low operating torque: In addition to the standard sealing ring, the packing gland is also equipped with an "O" type sealing ring.
In the closed position, the ball is pressed against the valve seat by the [wiki]mechanical[/wiki] of the valve stem.
Before use, water should be used to clean the pipeline and the flow part of the valve body to prevent residual iron filings and other debris from entering the valve body cavity.
The pipelines before and after the ball valve are ready. The front and rear pipes should be coaxial, and the sealing surfaces of the two flanges should be parallel.