Views: 0 Author: J-VALVES Publish Time: 2024-03-04 Origin: Site
In industrial piping systems, flange gate valves and welded gate valves are two common types of valves. Their selection strategies are closely related to pressure ratings. The following are selection suggestions for these two types of valves based on different pressure ratings.
I. Low-pressure working conditions (pressure level ≤ PN16)
Under low-pressure working conditions, flanged gate valves are usually the first choice. This kind of valve is connected to the pipeline through flange plates and bolts. It is very convenient for installation and disassembly and is convenient for maintenance and replacement. The sealing performance of the flanged gate valve is better and can meet the needs of low-pressure pipeline systems. In addition, the flexibility of flange connection makes the adjustment and expansion of the pipeline system easier.
II. Medium-pressure working conditions (pressure level PN16 - PN63)
Under medium-pressure working conditions, both flanged gate valves and welded gate valves can be used, but a trade-off needs to be made according to the specific working conditions. The advantage of flanged gate valves is that they are convenient for maintenance and replacement and are suitable for occasions that require frequent operation or may require regular maintenance. Welded gate valves, on the other hand, have better sealing performance and higher structural strength and can withstand higher pressure fluctuations and are suitable for occasions with extremely high sealing requirements.
III. High-pressure working conditions (pressure level ≥ PN100)
Under high-pressure working conditions, welded gate valves are usually a more suitable choice. Welded gate valves are connected to the pipeline by welding. The connection is firm and the sealing is good. It can withstand higher pressure and temperature changes. Welded gate valves reduce the leakage risk that may be caused by flange connections and are especially suitable for pipeline systems with high pressure, high temperature, and the transportation of toxic or valuable media. In addition, welded gate valves have a compact structure and higher overall strength and are suitable for long-term stable operation in a high-pressure environment.
High-temperature working conditions:
In a high-temperature environment, welded gate valves have better thermal stability and can effectively reduce the leakage risk caused by thermal expansion. The welded connection method makes the valve and the pipeline become a whole, enhancing the overall strength of the system.
For pipeline systems transporting toxic, flammable, explosive, or valuable media, the sealing advantage of welded gate valves is more prominent. Welded connections reduce leakage points and reduce the risk of medium leakage, thereby improving the safety of the system.
In cramped spaces, the compact structure of welded gate valves may be more suitable. Welded gate valves do not require additional flange connection space and can better adapt to a compact installation environment.
The choice between flange gate valves and welded gate valves should be comprehensively considered based on pressure rating, working conditions, and maintenance requirements. In low-pressure working conditions, flange gate valves are more favored due to their convenience in installation and maintenance. While in high-pressure working conditions, the sealing and strength advantages of welded gate valves make them a more suitable choice. For special working conditions, such as high temperature, toxic media, or limited space occasions, further evaluation of the valve's performance and safety is needed to ensure the stable operation of the system.
