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Overview of pneumatic ball valve


Release time:

2021-12-29

Overview of pneumatic ball valve

Today by the Xinming automatic control valve industry to introduce an overview of pneumatic ball valve.

Pneumatic ball valveIs the ball valve with a pneumatic actuator, pneumatic actuator execution speed is relatively fast, within the scope of the fast switching speed of 0.05 seconds/times, so usually also called pneumatic quick cut-off ball valve. Pneumatic ball valves are usually equipped with various accessories, such as solenoid valves, gas source processing tripod, limit switches, positioners, control boxes, etc., to achieve local control and remote centralized control, and the valve can be controlled in the control room. Switch, do not need to go to the scene or bring manual control at high altitude and dangerously, saving human resources and time and safety to a large extent.
       Pneumatic ball valveOnly need to use pneumatic actuator with air source to rotate 90 degrees of operation and a small torque can be closed tightly. Completely equal body cavity for the medium to provide a small resistance, straight-through flow. It is generally believed that the ball valve is suitable for direct opening and closing. The main feature of the ball valve is its own compact structure, easy operation and maintenance, suitable for water, solvents, acids and natural gas and other general working media, but also suitable for poor working conditions of the medium, such as oxygen, hydrogen peroxide, methane and ethylene. The ball valve body can be integral or combined.
The ball of the floating ball pneumatic ball valve is floating. Under the action of the medium pressure, the ball can produce a certain displacement and press on the sealing surface of the outlet end to ensure the sealing of the outlet end. The structure of the floating pneumatic ball valve is simple and the sealing is good, but the ball bears the load of the working medium all passed to the outlet sealing ring, so it is necessary to consider whether the sealing ring material can withstand the working load of the ball medium. This structure is widely used in medium and low pressure ball valves.
The ball of the fixed ball pneumatic ball valve is fixed and does not move after being pressed.


Fixed ball valve with a floating valve seat, by the medium pressure, the valve seat to produce movement, so that the sealing ring pressed on the ball to ensure sealing. Usually in the upper and lower shaft with the ball is equipped with bearings, the operating torque is small, suitable for high pressure and large diameter valves. In order to reduce the operating torque of the pneumatic ball valve and increase the reliability of the seal, there has been an oil-sealed ball valve, which is injected with a special lubricating oil between the sealing surfaces to form a layer of oil film, which enhances the sealing performance and reduces the operating torque. It is more suitable for high-pressure and large-diameter ball valves.
elastic ball
The ball of the pneumatic ball valve is elastic. Ball and valve seat sealing ring are made of metal materials, the sealing pressure is very large, relying on the pressure of the medium itself has reached the requirements of the seal, should apply external force. This valve is suitable for high temperature and high pressure medium. The elastic sphere is to open an elastic groove at the lower end of the inner wall of the sphere to obtain elasticity. When the channel is closed, the wedge head of the valve stem is used to make the ball open and the valve seat to seal. Before rotating the ball, loosen the wedge head, and the ball will return to its original shape, so that there is a small gap between the ball and the valve seat, which can reduce the friction of the sealing surface and the operating torque.
Pneumatic ball valve according to its channel position can be divided into straight, three-way and right angle. The latter two ball valves are used to distribute the medium and change the flow direction of the medium.


Above is the Xinming automatic control valve industry to introduce the relevant content.

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