Utmost Flow Control Technology Co., Ltd.
Utmost Flow Control Technology Co., Ltd.

What are the Classification and Characteristics of Pneumatic Ball Valves?

Classification of Pneumatic Ball Valve

Floating Ball

Pneumatic ball valve has a floating ball, which can move a certain distance under the pressure of the medium, and press tightly on the sealing surface at the outlet to ensure the seal. In Utmost floating ball valve factory, The structure of the floating ball pneumatic ball valve is simple, with good sealing performance, but the ball bearing the working medium load is all transferred to the outlet sealing ring. Therefore, the material of the sealing ring should be considered whether it can withstand the working load of the ball medium. This structure is widely used in low and medium pressure ball valves.

Fixed Ball

The ball of the pneumatic ball valve is fixed and does not move after being pressurized. Fixed ball valves have floating valve seats. After being pressurized by the medium, the valve seats move and tightly press the sealing ring on the ball to ensure the seal. Generally, bearings are installed on the upper and lower axes of the ball, and 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, the oil seal ball valve appears. That is to press a special lubricating oil between the sealing surfaces to form an oil film, which enhances the sealing performance and reduces the operating torque, making it more suitable for high pressure and large diameter ball valves.

Elastic ball

The ball of the pneumatic ball valve is elastic. Both the ball and the sealing ring of the valve seat are made of metal materials. The sealing is much higher than the pressure. It must rely on external force to meet the sealing requirements if the pressure of the medium itself cannot achieve it. This type of valve is suitable for high temperature and high pressure media. The elastic ball is formed by opening an elastic groove at the lower end of the ball wall. When the channel is closed, the wedge-shaped head of the valve stem is used to expand the ball and press it tightly on the valve seat to achieve the seal. Before rotating the ball, release the wedge-shaped head to allow the ball to return to its original shape, which allows a small gap between the ball and the valve seat, reducing friction and operating torque. Utmost pneumatic ball valve factory has straight-through, three-way, and right-angle types according to their channel positions. The last two ball valves are used to distribute media and change the flow direction of media.

Characteristics of Pneumatic Ball Valve

Pneumatic ball valve is mainly used to cut off or connect the medium in the pipeline, and it can also be used for fluid regulation and control. Compared with pneumatic control valves and other types of valves, pneumatic ball valves have angular stroke output torque, fast opening, smooth and reliable operating, and wide applicability with the following advantages.

  • The fluid resistance is small, and the pneumatic ball valve is the valve with the smallest fluid resistance among all valve classifications, even if it is a reduced diameter pneumatic ball valve, its fluid resistance is still quite small.

  • The thrust bearing reduces the friction torque of the valve stem, which can make the valve stem operate smoothly and flexibly for a long time.

  • The sealing performance of the valve seat is good. The sealing ring made of elastic materials such as polytetrafluoroethylene is easy to seal, and the valve sealing ability of the pneumatic ball valve increases with the increase of medium pressure.

  • The sealing of the valve stem is reliable. Due to the fact that the stainless steel pneumatic ball valve stem only performs rotary motion instead of lifting motion, the filler sealing of the valve stem is not easily damaged, and the sealing ability increases with the increase of medium pressure.

  • Since materials such as polytetrafluoroethylene have good self-lubricating properties, there is little friction loss with the ball, so the service life of the pneumatic ball valve is long.

  • Anti-static function: a spring is set between the ball, the valve stem, and the valve body, which can lead out the static electricity generated during the switching process.

  • The down-mounted valve stem and the protruding step at the head of the valve stem prevent the valve stem from being ejected. In case the valve stem seal is damaged due to a fire, the protruding step can form a metal contact with the valve body to ensure the valve stem seal.

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