The pneumatic forged steel fixed ball valve operates using compressed air and features a fixed ball design made of forged steel, primarily used for controlling pipelines handling high pressure, high temperature, and corrosive media. Its core features include a bi-directional sealing structure, spring preloaded valve seat, full bore design, and pneumatic drive mechanism, making it suitable for industrial fields such as oil, chemical, and natural gas.

Structural characteristics

Utilizing a fixed ball design, the valve core is secured by the upper and lower valve rods, paired with a bidirectional metal movable seal structure, which achieves automatic compensation through a spring tensioning component. The valve seat features a metal hard seal with bidirectional sealing properties, eliminating the need to consider the medium's flow direction. The valve body is available in a two-piece or three-piece structure, with the intermediate flange using an enhanced polytetrafluoroethylene stainless steel composite seal ring to ensure sealing reliability.

Sealed design

The valve seat assembly features spring pre-tension and self-tightening effects. Fluid pressure is transmitted through bearings, preventing the ball from squeezing the seat and maintaining sealing stability. The sealing surface can be optioned with hardfacing alloy or PTFE material, with a temperature resistance range of -196°C to 350°C.

Application Scenario

Suited for severe conditions such as high-pressure natural gas long-distance pipelines, corrosive media containing hydrogen sulfide, and fluid containing particles or impurities. Nominal bore ranges from DN25 to 800, pressure classes cover from Class 150 to 2500 standards, and operating temperature ranges from -196°C to 450°C. Equipped with an automatic pressure relief valve and fire-resistant structure, compliant with industry standards such as API 6D and ASME B16.34.