High-pressure Gate Valve Selection Guide: When To Choose A Pressure-sealed Valve Cover

II. When to Choose a Pressure Seal Bonnet
Selecting a pressure seal bonnet requires a comprehensive consideration of multiple factors, including working pressure, temperature, medium type, sealing requirements, and cost. The following are some key scenarios for choosing a pressure seal bonnet:
(1) High-pressure Environment
If the working pressure of the application scenario exceeds 1500 psi (10 MPa), a pressure seal bonnet is usually the best choice. In such a high-pressure environment, a traditional bolted bonnet may not provide sufficient sealing performance, while the self-enhancing sealing mechanism of the pressure seal bonnet can effectively prevent leakage.
(2) High-temperature Environment
In a high-temperature environment, the sealing performance of the valve may be affected by thermal expansion and changes in material properties. The design of the pressure seal bonnet can adapt to the high-temperature environment and ensure the sealing reliability under high-temperature and high-pressure conditions. For example, in the high temperature steam system of a power station, the pressure seal bonnet is the first choice.
(3) Corrosive Media
If the valve needs to control corrosive media, such as acids, alkalis, or salt solutions, the corrosion resistance and sealing performance of the pressure seal bonnet make it an ideal choice. Its sealing elements are usually made of corrosion-resistant materials, which can effectively prevent media leakage.
(4) High Sealing Requirements
In some application scenarios, such as the food processing, pharmaceutical industries, or high-risk chemical environments, there are extremely high requirements for the sealing performance of the valve. The pressure seal bonnet can provide excellent sealing performance, ensuring that the media will not leak, thus meeting these high-sealing requirements.