What are the characteristics and advantages of pneumatic fixed ball valves?

Advantages of pneumatic fixed ball valve
1. Full bore or reduced diameter: Full bore or reduced diameter structure can be selected as required. The flow aperture of the full-bore valve is the same as the inner diameter of the pipeline, which is convenient for pipeline cleaning.
2. The valve stem can be lengthened: According to the needs of installation or operation, the valve stem can be lengthened. The extended stem ball valve is especially suitable for occasions where pipelines need to be buried in the ground, such as city gas. The size of the extended stem is determined according to customer needs.
3. Sealing emergency grease injection rescue: due to foreign matter in the medium or fire causing the valve seat seal to fail unexpectedly, 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 bearing with small friction coefficient and good self-lubricity are adopted, which greatly reduces the operating torque of the valve. Therefore, even if no sealing grease is provided, the valve can be operated flexibly for a long time.
5. Reliable valve stem sealing and low operating torque: In addition to the standard sealing ring, the packing gland is also equipped with an "O" type sealing ring. The double sealing ensures the reliability of the valve stem sealing; additional graphite packing and Sealing grease injection reduces the stem leakage after fire to 1 low. The valve stem sliding bearing and thrust bearing make the valve operation easier.

Features of pneumatic fixed ball valve
1. Fire safety structure: All valves have fire safety functions, and their design and manufacturing follow the requirements of API607 and API6FA.
2. Double blocking and discharge function: the pneumatic fixed ball valve adopts a spring to pre-tension the floating valve seat. When the valve is in the fully open or fully closed state, the upstream and downstream valve seats block the fluid, and the retentate in the valve body cavity passes through the discharge valve. excretion.
3. Automatic pressure relief function: When the temperature of the medium in the valve body cavity rises and causes abnormal pressure rise, it does not need to pass through the safety valve, but the valve seat function can automatically relieve the pressure, which is to ensure the safety of the valve when transporting liquid media. Sex is very important.
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 harsh environment resistance have been specially considered in the design, and it is suitable for various corrosive and non-corrosive media. . Compared with the floating ball valve, when working, the force generated by the fluid pressure in front of the valve on the ball is all transmitted to the bearing, and the ball will not move to the valve seat, so the valve seat will not bear excessive pressure, so the fixed ball valve The torque is small, the deformation of the valve seat is small, the sealing performance is stable, and the service life is long. It is suitable for high pressure and large diameter occasions. Advanced spring pre-valve seat assembly, with self-tightening characteristics, to achieve upstream sealing. Each valve has two valve seats, which can be sealed in each direction, so the installation has no flow direction restriction and is two-way. This valve is generally installed horizontally.

Pneumatic fixed ball valves have two-piece and three-piece valve body structures. The middle flange is connected by bolts, and the seal adopts reinforced PTFE embedded in the stainless steel ring. There is a spring at the back of the steel ring to ensure that the valve seat is tightly attached to the ball. Keep it sealed. The upper and lower valve stems are equipped with PTFE bearings to reduce friction and save effort. The bottom of the small shaft has an adjustment plate to ensure the joint position of the ball and the sealing ring.
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