1. Leakage at the connection between stainless steel gate valve and gate valve
Firstly, check whether the connecting bolts between the gate valve and the gate valve are tightened. If they are not tightened, the sealing gasket ring inside the valve may not fully integrate with the flange sealing groove surface, which can often lead to leakage. The bolts and nuts should be inspected in sequence, and all bolts should be tightened until the sealing gasket is tightened. Secondly, the size and accuracy of the sealing gasket ring and flange sealing groove surface should be checked. If the sealing contact surface size is incorrect or too rough, the sealing gasket ring should be repaired or updated. Furthermore, check if there are any pitting, sand holes, sand holes, or impurities in the contact surface between the sealing gasket ring and the flange sealing groove. If there are such defects, they should be repaired, repaired, or cleaned accordingly.
2. Leakage of stainless steel gate valve cover
The leakage of the valve cover is mainly manifested in the leakage of the packing seal. Firstly, check whether the sealing element is selected correctly and whether it matches the sealing groove. If there are such problems, replace the sealing ring or repair the sealing groove. Secondly, check if there are any burrs, fractures, or twisting on the sealing components. In this case, replace the sealing components. Furthermore, check whether the sealing surfaces of each sealing groove are rough or have other defects. If there are defects, they should be eliminated or damaged parts should be replaced.
There are packing materials inside the valve cover or bracket that are sealed by compression. The installation of these packing materials should be checked. If it is found that the upper and lower packing materials are installed upside down, they should be removed and reinstalled according to the correct method. Special attention should be paid to the fitting of the packing sealing surface. Furthermore, check whether the accuracy of each contact surface of the sealing element meets the specified requirements.
3. Leakage on the surface of the stainless steel gate valve body cavity
During the casting process of valve bodies, sometimes casting defects such as sand holes and sand holes may appear, which are difficult to detect during machining. Once pressure is applied, hidden casting defects will be exposed. If this situation occurs, it needs to be repaired, repaired, or updated.
4. How stainless steel bullies the leakage at the valve seat and valve plate
Leakage at the valve seat and valve plate is the most common phenomenon in the installation or maintenance of gate valves. It can generally be divided into two categories: one is leakage from the sealing surface, and the other is leakage from the root of the sealing ring.
Firstly, the accuracy of the sealing surface in contact with the valve seat and valve plate should be checked. This sealing surface should be ground at least. If the surface accuracy is found to be too rough, it should be removed and ground again. Secondly, check if there are defects such as pitting, indentation, sand holes, cracks, etc. on the sealing surface. If this occurs, the valve plate or valve seat should be replaced. For valve seats with pressure springs, the elasticity of the pressure spring should be checked to ensure it meets the requirements. If the elasticity weakens, the pressure spring should be updated. Furthermore, check if the T-shaped connection between the valve plate and the valve stem is too loose, causing the valve plate to tilt during the compression process. In this case, the valve plate should be removed and adjusted to the optimal size.
At the opening of the valve body, it is easy for foreign objects such as welding, iron filings, and impurities to enter during the installation process. Such debris should be cleaned before installation. If the cleaning is forgotten or not thorough, it will cause the valve plate to not close to the expected depth and cause leakage. In this case, the valve body should be removed and cleaned again.
When installing the stainless steel gate valve seat, special installation tools should be used and the seat should be checked for proper installation. If the thread cannot be tightened to the expected depth, leakage may occur at the seat. In this case, special tools should be used to reinstall the seat.