Pneumatic ball valve is a device used to control fluid flow, pressure and flow direction, which plays an important role in fluid transportation system. And with the continuous development of the product, its role in peacetime use is more and more important. It gradually replaces other valve types, which have more advantages.
The pneumatic ball valve can be closed tightly only with the operation of cyclotron rotation degree and very small rotating torque. The completely equal inner cavity of the valve body provides the medium with a straight flow passage with little resistance. It is generally believed that ball valves are suitable for direct open/close operation, but recent development has planned ball valves to be used for throttling and flow control. The key feature of pneumatic ball valve is its compact structure, easy operation and repair, suitable for water, solvent, acid, natural gas and other common operating media, and also suitable for media with poor operating conditions, such as oxygen, hydrogen peroxide, methane and ethylene.
The valve body of the pneumatic ball valve can be all or combined. The performance speed of pneumatic actuator is relatively fast, and workers do not need to do it by themselves, which saves human resources and time to a large extent. Pneumatic ball valve is evolved from plug valve. It has the same rotation and lifting action, but the difference is that the cock body is a sphere with a circular through hole or channel passing through its axis. The share of the sphere and the passage port should be such that when the sphere rotates 90 degrees, all spheres should appear at the inlet and outlet, and then cut off the flow.
The pneumatic ball valve only needs compressed air to enter the pneumatic actuator. The air source drives the ball core to rotate 0-90 degrees and a small rotating torque to control the opening and closing of the ball valve. The valve positioner can be assembled according to the working conditions, so as to control the opening of the ball core of the ball valve to adjust the medium flow. The ball rotates around the center line of the valve body to achieve opening, and a circular through hole or channel passes through its axis. When the ball center rotates to 90 °; When the valve is closed tightly, when the actuator is working, it only needs a small rotating torque to close the valve tightly, so that the principle of quick cut-off can be achieved.
characteristic:
(1) The fluid resistance is small, and the full bore ball valve basically has no flow resistance.
(2) Simple structure, small size and light weight.
(3) Tight. It has two sealing surfaces. At present, the sealing surface of the ball valve is made of plastic, which has good sealing performance and can realize sealing. It has also been used in vacuum systems.
(4) It is easy to operate, fast to open and close, and only needs to rotate 90 ° from full open to full close, which is convenient for remote control.
(5) Convenient maintenance, simple structure of ball valve, generally movable sealing ring, easy removal and replacement.
(6) When the valve is fully opened or closed, the sealing surfaces of the ball and valve seat are isolated from the medium. When the medium passes through, it will not cause erosion of the valve sealing surface.
(7) It is widely used, ranging from a few millimeters to several meters in diameter, from high vacuum to high pressure.
(8) The ball valve can be used in media with suspended solid particles due to its wiping property during opening and closing.
