气动固定球阀是下一代高性能球阀，适用于长送管线和一般工业管线，其强度、安全性、耐恶劣环境性等在设计时有特殊考虑，适用于各种腐蚀性和非腐蚀性介质。与浮动球阀相比，工作时阀前流体压力产生于球的作用力全部传递至轴承，不将球移动至阀片，因此阀片无法承受过大的压力，因此固定式球阀的转矩小阀片变形小，密封性能稳定，使用寿命长，适用于高压、大口径。先进的分离预桶组件具有自连接特性，并且实现上游密封。各阀有两个阀座，各方向密封，安装无流向限制，是双向的。这个阀门一般是水平安装的。

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.

气动固定球阀有两个式和三个式两种阀体结构，其中螺栓连接，密封采用强化聚四氟乙烯嵌入不锈钢环内，钢轮后部有弹簧保证阀片紧贴球体，并保持密封。上下阀杆上有PTFE轴承，减少摩擦，省力操作，小轴底部有调整片，保证球与密封圈的连接位置。

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.

气动固定球阀的特点：1、防火安全结构：阀具有防火安全功能，其设计、制造遵循API607和API6FA规范要求。2、双重闭塞和排出功能：气动固定球阀采用弹簧压住浮置阀片，无论阀处于全开或全闭状态，上下侧的阀片都能阻断流体阀体内滞留物通过排出阀排泄。3、自动漏压功能：当阀腔滞留介质温度上升导致异常升压时，无需通过安全阀，可通过阀片功能自动漏压这对于确保阀门运输液体介质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.

气动固定球阀的工作原理：可通过气动致动器用气源旋转90度的操作和小转矩严格关闭。完全平等的阀体内腔为介质提供阻力小、直通的流道。一般认为球阀非常适合直接开闭，但是球阀是为了节流和流量控制而设计的。球阀的主要特点是其结构紧凑，操作和维护方便。

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.