Pneumatic ball valve is used to control fluid flow, pressure and flow direction of a device, plays an important role in the fluid delivery system. And with the continuous development of products, its role in the usual use of more and more, it gradually replaced other valve types, this type of valve has more advantages.
The pneumatic ball valve can be closed tightly with the operation of cyclonic rotation and small rotating torque. The completely equal inner cavity of the valve body provides the medium with a small resistance and a straight flow passage. It is generally thought that ball valve is suitable for direct opening and closing operation, but in recent years, ball valve has been planned to be used for throttling and flow control. The key feature of pneumatic ball valve is its compact structure, easy to operate and repair, suitable for water, solvent, acid and natural gas and other common working media, and also suitable for the medium with bad working conditions, such as oxygen, hydrogen peroxide, methane and ethylene.
The valve body of pneumatic ball valve can be integral or combined. The performance speed of pneumatic actuator is relatively fast, and does not need workers to do it personally, which saves human resources and time to a great extent. Pneumatic ball valve is evolved from plug valve. It has the same degree of rotation lifting action, the difference is that the cock body is a ball, with a circular through hole or channel through its axis. When the ball rotates 90 degrees, all spheres appear at the inlet and outlet, and then the flow is cut off.
The pneumatic ball valve only needs compressed air to enter the pneumatic actuator, and the air source drives the ball core to rotate 0-90 degrees. The operation and small rotation torque can control the switch 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 open, and has a circular through hole or passage through its axis. When the ball center rotates to 90 degrees, the valve is in a closed state. When the actuator works, the valve can be closed tightly with only a small rotating torque, so as to achieve the principle of fast cut-off.
(1) the flow resistance is small, and there is no flow resistance for the full bore ball valve.
(2) simple structure, small volume and light weight.
(3) compact. It has two sealing surfaces, and the sealing surface material of ball valve is plastic, which has good sealing performance and can realize sealing. It has also been used in vacuum system.
(4) it is easy to operate and fast to open and close. Only 90 ° rotation is needed from full opening to full closing, which is convenient for remote control.
(5) the maintenance is convenient, the ball valve structure is simple, the sealing ring is generally movable, and it is convenient to dismantle and replace.
(6) when the valve is fully open or closed, the sealing surface of the ball and valve seat is isolated from the medium, and the medium will not cause erosion of the valve sealing surface.
(7) wide range of applications, ranging from small to a few millimeters, from high vacuum to high pressure.
(8) in the process of cleaning, the particles can be suspended in the ball valve.