The sealing performance of the flat gate valve can be judged from the following aspects:
Observe the appearance quality: the good flat gate valve shall be smooth and clean without obvious defects such as concave-convex, scratch and rust. However, for the flat gate valve with poor sealing performance, its surface treatment is often poor and obvious defects exist.
Check the material quality: the material quality of the flat gate valve has a great impact on the sealing performance. The valve body, valve seat, gate plate and other key parts of the flat gate valve are usually made of good materials, such as stainless steel, alloy steel, etc., to ensure the stability and durability of the sealing performance.
Check the manufacturing process: the manufacturing process of the flat gate valve also has a great impact on its sealing performance. In the manufacturing process of flat gate valve, advanced processing equipment and processes, such as precision casting, heat treatment and surface treatment, are adopted to ensure the dimensional accuracy and surface quality of each component. However, the manufacturing process of the flat gate valve with poor sealing performance is often rough, and the dimensional accuracy and surface quality are difficult to guarantee.
Check the sealing ring: the sealing ring of the flat gate valve is one of the key components affecting its sealing performance. High-temperature, corrosion-resistant and wear-resistant sealing ring materials, such as fluorine rubber and silicon rubber, are generally used for flat gate valves. However, for the flat gate valve with poor sealing performance, the sealing ring materials are often of poor quality, easy to be aged, deformed and worn, resulting in reduced sealing performance.
Price of flat gate valve
Sealing test: when purchasing the flat gate valve, the supplier can be required to provide the sealing test report, or carry out the sealing test to check the sealing performance of the flat gate valve. During the test, the sealing test can be carried out for the flat gate valve by pressurizing or vacuumizing to observe whether there is leakage on the sealing surface. Meanwhile, the sealing performance of the flat gate valve under different pressure and temperature can be checked.
To sum up, the sealing performance of the flat gate valve shall be comprehensively evaluated from multiple aspects. When selecting and using the flat gate valve, it is suggested to select the well-known brand and supplier with quality guarantee to ensure its excellent sealing performance and service life.
