In the daily use of the valve, often encounter a variety of failures, valve leakage is the most common one of many failures, and the leakage of the valve is generally internal leakage and external leakage of two situations. So what’s the difference?
The valve’s internal leakage generally refers to when the valve is completely closed, there is still medium from the valve flow path outlet outflow, leakage or leakage, and so on. The cause of the failure is usually due to erosion of the medium or containing impurities and other reasons. Even if the valve lead screw (stem) tight in place, because the valve core and valve body are still a gap between the media can flow through.
External leakage of the valve generally refers to when the valve is fully closed or open, the valve packing external sealing parts, leakage of media. That is, between the valve and the connecting flange or connecting thread, the seal is not strict resulting in the media flow out of the connecting seal face, or between the valve stem and the gland (that is, the gland of the pressure plate on the valve stem) seal is not strict resulting in media leakage, or the valve body rough tracheotomy caused by the external leakage, as well as the media erosion caused by the valve body wear leakage.
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Post time: Jul-28-2021