氣動固定球閥是下一代高性能球閥，適用于長送管線和一般工業管線，其強度、安全性、耐惡劣環境性等在設計時有特殊考慮，適用于各種腐蝕性和非腐蝕性介質。與浮動球閥相比，工作時閥前流體壓力產生于球的作用力全部傳遞至軸承，不將球移動至閥片，因此閥片無法承受過大的壓力，因此固定式球閥的轉矩小閥片變形小，密封性能穩定，使用壽命長，適用于高壓、大口徑。先進的分離預桶組件具有自連接特性，并且實現上游密封。各閥有兩個閥座，各方向密封，安裝無流向限制，是雙向的。這個閥門一般是水平安裝的。

Pneumatic fixed ball valve is the next generation high-performance ball valve, suitable for long-distance pipelines and general industrial pipelines. Its strength, safety, and resistance to harsh environments are specially considered in the design, and it is suitable for various corrosive and non corrosive media. Compared with floating ball valves, the fluid pressure in front of the valve during operation is transmitted entirely to the bearing due to the force of the ball, and the ball is not moved to the valve plate. Therefore, the valve plate cannot withstand excessive pressure. Therefore, fixed ball valves have smaller torque, smaller deformation of the valve plate, stable sealing performance, and longer service life, making them suitable for high pressure and large diameters. The advanced separation pre barrel component has self connecting characteristics and achieves upstream sealing. Each valve has two valve seats, sealed in all directions, and can be installed in both directions without flow restrictions. This valve is usually installed horizontally.

氣動固定球閥有兩個式和三個式兩種閥體結構，其中螺栓連接，密封采用強化聚四氟乙烯嵌入不銹鋼環內，鋼輪后部有彈簧保證閥片緊貼球體，并保持密封。上下閥桿上有PTFE軸承，減少摩擦，省力操作，小軸底部有調整片，保證球與密封圈的連接位置。

There are two types of valve body structures for pneumatic fixed ball valves: two-piece and three piece. The valve body is connected by bolts and sealed with reinforced polytetrafluoroethylene embedded in a stainless steel ring. There is a spring at the rear of the steel wheel to ensure that the valve plate is tightly attached to the ball and maintains a seal. There are PTFE bearings on the upper and lower valve stems to reduce friction and facilitate operation. There are adjustment plates at the bottom of the small shaft to ensure the connection position between the ball and the sealing ring.

氣動固定球閥的特點：1、防火安全結構：閥具有防火安全功能，其設計、制造遵循API607和API6FA規范要求。2、雙重閉塞和排出功能：氣動固定球閥采用彈簧壓住浮置閥片，無論閥處于全開或全閉狀態，上下側的閥片都能阻斷流體閥體內滯留物通過排出閥排泄。3、自動漏壓功能：當閥腔滯留介質溫度上升導致異常升壓時，無需通過安全閥，可通過閥片功能自動漏壓這對于確保閥門運輸液體介質的安全性是非常重要的。

Characteristics of Pneumatic Fixed Ball Valve: 1. Fire Safety Structure: The valve has fire safety function, and its design and manufacturing follow the requirements of API607 and API6FA specifications. 2. Double blocking and discharge function: The pneumatic fixed ball valve adopts a spring to press the floating valve plate. Regardless of whether the valve is in a fully open or fully closed state, the upper and lower valve plates can block the discharge of fluid trapped in the valve body through the discharge valve. 3. Automatic leakage pressure function: When the temperature of the trapped medium in the valve chamber rises and causes abnormal pressure rise, there is no need to use a safety valve. The valve disc function can automatically leak pressure, which is very important for ensuring the safety of transporting liquid media through the valve.

氣動固定球閥的工作原理：可通過氣動致動器用氣源旋轉90度的操作和小轉矩嚴格關閉。完全平等的閥體內腔為介質提供阻力小、直通的流道。一般認為球閥非常適合直接開閉，但是球閥是為了節流和流量控制而設計的。球閥的主要特點是其結構緊湊，操作和維護方便。

The working principle of a pneumatic fixed ball valve is that it can be operated by a pneumatic actuator to rotate 90 degrees with a gas source and tightly closed with a small torque. The completely equal valve body cavity provides a low resistance and direct flow channel for the medium. It is generally believed that ball valves are very suitable for direct opening and closing, but they are designed for throttling and flow control. The main characteristics of ball valves are their compact structure, easy operation and maintenance.