The pneumatic ball valve is a ball valve with a pneumatic actuator, and the pneumatic ball valve is evolved from a globe valve. It has the same 90 degree rotation lifting action, the difference is that the cock body is a sphere, and there is a channel through hole or a circle through its axis. The ratio of the sphere to the port should be such that when the ball rotates 90 degrees, all spheres should appear at the inlet and outlet, cutting off its flow.
The working principle of the pneumatic ball valve is to rely on the rotary valve to block or unblock the valve. The pneumatic ball valve switch is light and small, so it can be made into a large diameter, simple structure, reliable sealing, and convenient maintenance. Wide range of applications.
Pneumatic ball valves have now been widely used in petroleum, chemical, power generation, papermaking, atomic energy, aviation, rockets and other sectors, as well as people's daily life.
Pneumatic ball valve and plug valve belong to the same type of valve, but its closure is a sphere, and the sphere rotates around the centerline of the valve body to achieve a closed and open valve.
1. The switch is fast and convenient, which can meet the requirements of fast opening and fast closing of high-altitude dark passages for pipelines.
2. The fluid resistance is small, so whether it is a full-bore type reduced diameter ball valve, it is the one with the smallest fluid resistance among all valves.
3. Reliable valve seat seal. Generally, ball seals are made of tetrafluoroethylene-type other polymer materials with better plasticity. In places with higher requirements for sealing, soft seals are easier to ensure sealing, and metal seals are less than hard. Sealing> structure can withstand 10Npa, 16Npa, 32Npa high pressure and can withstand high temperature 350 ℃ in daily life.
4. Reliable valve stem seal, the inverted seal structure of the valve stem can increase with the progress of the medium, once the ball valve is opened and closed, the valve stem only rotates, not lifts. The sealing packing of the valve stem is not easy to be damaged. The sealing life of the valve stem is greatly extended.
5. The service life is long, and the pneumatic device is more than 60,000 in the damage test. Because the sealing parts of the ball valve are mostly made of polytetrafluoroethylene and other materials with good self-lubricating properties, the conflict and wear of the ball valve and the valve stem are small, which ensures the service life of the valve.
