Features And Advantages Of Pneumatic Trunnion Mounted Ball Valves

Advantages of Lined Ball Valve

1. Full bore or reduced bore: Full bore or reduced bore structure can be selected as needed. The flow aperture of the full bore valve is consistent with the inner diameter of the pipeline, which is convenient for pipeline cleaning.

2. The valve stem can be lengthened: The valve stem can be lengthened according to the needs of installation or operation. The extended stem ball valve is particularly suitable for occasions such as city gas where pipelines need to be laid underground. The lengthened valve stem size is determined according to customer needs.

3. Emergency grease injection rescue for sealing: Due to foreign matter in the medium or fire causing accidental failure of the valve seat seal, the grease injection valve provides a quick connection with the grease injection gun, which can easily and quickly inject the sealing grease into the valve seat sealing part to alleviate leakage.

4. Flexible operation: The valve seat and stem bearings with small friction coefficient and good self-lubrication are used to greatly reduce the operating torque of the valve. Therefore, even if no sealing grease is provided, the valve can be operated flexibly and freely for a long time.

5. Reliable stem seal and low operating torque: In addition to the standard sealing ring, an "O" type sealing ring is also set on the packing gland. The double seal ensures the reliability of the stem seal; the additional graphite packing and sealing grease injection minimize the stem leakage after the fire. The stem sliding bearing and thrust bearing make the valve easier to operate.

Features of pneumatic fixed ball valve

1. Fire safety structure: The valves are equipped with fire safety functions, and their design and manufacturing comply with API 607 ​​and API 6FA specifications.

2. Double blocking and discharge function: The pneumatic fixed ball valve adopts a spring preloaded floating valve seat. Regardless of whether the valve is in the fully open or fully closed state, the valve seats on the upstream and downstream sides block the fluid, and the retained materials in the valve body cavity are discharged through the discharge valve.

3. Automatic pressure relief function: When the temperature of the medium retained in the valve body cavity rises and causes abnormal pressure increase, it does not need to pass through the safety valve, but can automatically release the pressure only by the valve seat function, which is very important to ensure the safety of the valve when conveying liquid media.

The pneumatic fixed ball valve is a new generation of high-performance ball valve, suitable for long-distance pipelines and general industrial pipelines. Its strength, safety, and resistance to harsh environments are specially considered during design, and it is suitable for various corrosive and non-corrosive media. Compared with the floating ball valve, when it is working, the force generated by the fluid pressure before the valve on the ball is fully transmitted to the bearing, and the ball will not move toward the valve seat, so the valve seat will not be subjected to excessive pressure. Therefore, the fixed ball valve has small torque, small seat deformation, stable sealing performance, and long service life, which is suitable for high-pressure and large-caliber occasions. The advanced spring pre-seat assembly has self-tightening characteristics to achieve upstream sealing. Each valve has two valve seats, which can be sealed in each direction, so there is no flow restriction during installation, and it is bidirectional. This valve is generally installed horizontally.

The pneumatic fixed ball valve has two valve body structures: two-piece and three-piece. The middle flange is connected with bolts. The seal is made of reinforced polytetrafluoroethylene embedded in the stainless steel ring. There is a spring at the back of the steel ring to ensure that the valve seat is close to the ball and maintains the seal. Both the upper and lower valve stems have PTFE bearings to reduce friction and save effort in operation. There is an adjustment plate at the bottom of the small shaft to ensure the connection position between the ball and the sealing ring.