First, check whether the valve and valve connecting bolts are tightened. If they are not tightened, the internal sealing ring and the flange sealing groove surface are not fully integrated, which will often lead to leakage. The bolts and nuts should be checked in sequence, and all bolts should be tightened until the gasket ring is compressed. Secondly, check the size and accuracy of the stainless steel gate valve sealing ring and flange sealing groove surface. If the size of the seal contact surface is incorrect or too rough, the gasket ring should be repaired or updated. In addition, check whether the contact surface between the gasket ring and the flange sealing groove is corroded, sand holes, sand holes or impurities. If there are such defects, they must be repaired, repaired or cleaned up accordingly.
The leakage of stainless steel gate valve cover is mainly manifested in the leakage of packing seal. First, check whether the seal is selected correctly and whether it matches the seal groove. If there is such a problem, replace the seal ring or repair the seal groove. Secondly, check whether the seals have burrs, fracturing, twisting, etc. If this is the case, replace the seals. In addition, check whether the sealing surface of each sealing groove is rough or has other defects. If there is a defect, the defect must be eliminated or the damaged part must be updated.
The stainless steel gate valve bonnet or bracket has packing that is sealed by compression. The installation of these packings should be checked. If it is found that the upper and lower packings are installed upside down, they must be removed and re-installed according to the correct method. Pay special attention to the matching of the joint surfaces of the packing seals. In addition, check whether the accuracy of each contact surface of the seal meets the specified requirements. Qualified manufacturers of gate valves will inspect them in advance.
In the process of casting the valve body, casting defects such as sand holes and sand holes sometimes appear. These defects are difficult to find in the process of machining. Once pressure is applied, hidden casting defects will be exposed. In this case, the stainless steel gate valve must be repaired, repaired or updated.
Leakage at the valve seat and valve plate is a common phenomenon in the installation or maintenance of stainless steel gate valves. Generally can be divided into two categories: one is the leakage of the sealing surface, and the other is the leakage of the root of the sealing ring.
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