How did the pneumatic ball valve evolve?


Pneumatic ball valve evolved from globe valve The pneum […]

Pneumatic ball valve evolved from globe valve
The pneumatic ball valve has the same 90-degree rotating action. The difference is that the plug body is a sphere with a circular through hole or channel passing through its axis. The ratio of the spherical surface and the channel opening should be such that when the ball rotates 90 degrees, all the spherical surfaces should be present at the inlet and outlet, thereby cutting off the flow.
Pneumatic ball valve works by rotating the valve to make the valve unblocked or blocked. Pneumatic ball valve switch is light and small, can be made into a large diameter, reliable sealing, simple structure, easy maintenance, the sealing surface and the spherical surface are often in a closed state, not easy to be eroded by the medium, and is widely used in various industries.
Pneumatic ball valve and plug valve are the same type of valve, only its closing part is a ball, and the ball rotates around the center line of the valve body to achieve opening and closing.
First, the switch is quick and convenient, and can meet the requirements of the pipeline for quick opening and closing of the high altitude dark road.
Second, the fluid resistance is small, 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 seals, ordinary ball seals are made of tetrafluoroethylene type other polymer materials with better plasticity, soft seals are easier to ensure sealing in places with higher requirements for sealing, metal seals, hard Seal> Structure can withstand 10Npa, 16Npa, 32Npa high pressure can withstand high temperature in daily life 350 ℃.
4. Reliable valve stem sealing, the reverse sealing structure of the valve stem can increase with the increase of the medium. Once the ball valve is opened and closed, the valve stem only performs rotary movement, not lifting movement. The sealing packing of the valve stem is not easily damaged. The sealing life of the valve stem is greatly extended.
Fifth, the service life is long, and the pneumatic device is more than 60,000 in the destructive test. Because the sealing parts of the ball valve are mostly made of PTFE with good self-lubricating properties, the friction and wear of the ball valve and the stem are minimized, ensuring the service life of the valve.