10

2019

-

10

There are "cool tips" to deal with several leakage problems of stainless steel gate valves

Author:


Although the selection of stainless steel gate valves depends on the quality of the ground, what is invariable is that the first is the working nature, the second is the setting position, then the span of the operating stainless steel gate valve hole, and the opening and closing force, and then the project cost. , these reference factors should also be combined with the characteristics of stainless steel gate valves and existing operational experience, and determined through technical and economic comparison.

    Although the selection of stainless steel gate valves depends on the quality of the ground, what is invariable is that the first is the working nature, the second is the setting position, then the span of the operating stainless steel gate valve hole, and the opening and closing force, and then the project cost. , these reference factors should also be combined with the characteristics of stainless steel gate valves and existing operational experience, and determined through technical and economic comparison.

 

The leakage problem of stainless steel gate valves should not be underestimated. Let us make a brief summary of the following issues. We hope that the corresponding use process will be helpful:

 

Leakage at the connection between stainless steel gate valve and gate valve

First, check whether the connection between the gate valve and the gate valve is tightened. If not, the sealing gasket ring and the flange sealing groove surface are not fully combined, which will cause leakage. The bolts and nuts should be inspected one at a time in sequence, and all bolts should be tightened until the sealing ring is pressed. If the sealing contact surface is the wrong size or too rough, the sealing ring gasket should be repaired or updated. Furthermore, check whether there is corrosion, sand holes, sand holes or impurities in the sealing ring and flange sealing groove. If there are such defects, corresponding repair welding, repair or cleaning should be carried out.

 

Valve cover leaking

 

Valve cover leakage is mainly manifested in the leakage of the packing seal. First check whether the seal is selected correctly and matches the sealing groove. If there is such a problem, replace the sealing ring or repair the sealing groove. Secondly, check whether the seal has burrs, cracks, twisting, etc. In this case, the seal must be replaced. Furthermore, check whether the sealing surface of each sealing groove is rough or have other defects. If defects exist, eliminate the defects or replace the damaged parts.

There are packings in the valve cover and cargo bracket that are sealed by compression. The installation of these packings should be checked. If the upper and lower packings are found to be installed upside down, they should be removed and reinstalled according to the correct method. Pay special attention to the joint surface of the packing seals. Furthermore, check whether the accuracy of each contact surface of the seal meets the specified requirements.

 

Stainless steel gate valve body cavity surface leakage

 

During the casting process of the valve body, casting defects such as sand holes and sand holes sometimes appear, which are difficult to detect during the machining process. Once pressure is applied, the hidden casting defects will be exposed. If this happens, it must be repaired. Not included, repaired or updated.

 

Leakage at valve seat and valve plate

 

Leakage from the valve seat and valve plate is the most common phenomenon during the installation or maintenance of gate valves. Generally, it can be divided into two categories: one is sealing surface leakage, and the other is sealing ring root leakage.

It is easy for welding slag, iron filings, impurities and other foreign matter to enter the opening inside the valve body during the installation process. Such debris should be cleaned before installation. If you forget to clean it or the cleaning is not complete, the valve plate will not close to the expected depth and leakage will occur. In this case, the valve body will need to be removed and cleaned again.

When installing the stainless steel gate valve seat, special installation tools should be used, and the valve seat should be checked to see if it is installed in place. If the thread is not as deep as expected, leakage will occur at the valve seat. In this case, special tools must be used to reinstall the valve seat. Install the valve seat.

 

The above is the relevant content of [There are "cool tips" for dealing with several leakage problems of stainless steel gate valves]. This content is excerpted from the Valve Network http://www.bf35.com/channel/t1543/tech.html Shanghai Longmeng Machinery's journey along the way ,thank you for your support!