Valve leakage can occur for several reasons.

The valve leakage of petrochemical equipment is mainly divided into two types, which are external valve leakage and internal valve leakage. Valve leakage mainly refers to the medium under the action of a certain bonding surface from inside out leakage. Or medium between stem and packing appeared from inside out leakage. Valve leakage mainly refers to the internal leakage of media caused by the improper sealing operation of the disc according to different globe valve disc type, valve core and other devices.

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