How To Prevent Leakage Of Bellow Seal Gate Valve

How to prevent leakage of Bellow Seal Gate Valve

The Bellow Seal Gate Valve will leak after long-term use, so how to prevent this problem?

This should be handled according to the leakage of the Bellow Seal Gate Valve.

Generally, the leakage of the Bellow Seal Gate Valve can be divided into the following two types: internal leakage and external leakage, and there are many reasons for leakage.

Internal leakage is generally due to the failure caused by the solid impurities contained in the liquid medium destroying the sealing surface. Combined with the analysis of on-site usage, the reason for the leakage of the valve stem is mainly related to the valve structure, working environment and operation mode.

Bellow Seal Gate Valve Stem structural adopts double sealing structure of bellows and packing, bellows and inner lining ring and outer lining ring are welded into bellows assembly, and then welded with valve stem and guide body, blocking medium leakage through the valve stem . The moving distance of the valve stem up and down moves the flat key upward until the upper end surface of the flat key contacts the lower end surface of the lower packing. Because the lower packing is made of PTFE material, if the valve is opened too much, the flat key will be embedded in the packing, the valve can no longer be opened and closed, and the bellows assembly will be hit, causing the medium to leak along the valve stem.

The extension length and compression amount of the bellows are determined according to the stroke of the valve. If the limit stretch or compression is exceeded, it may damage the bellows, cause the small series pipe to rupture, seal failure, flat plate.