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BlogHugong Valve is a well-known brand valve supplier that integrates research and development, manufacturing, sales, and service
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Hugong Valve is a well-known brand valve supplier that integrates research and development, manufacturing, sales, and service
Overview of Track Ball Valve Products
Release time:
2024-08-14
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Track ball valves are mainly used in pipelines for emergency shut-off, distribution
Track ball valves are mainly used in pipelines for emergency shut-off, distribution, and changing the flow direction of media. They can be divided into three types according to their structural forms: floating ball valves, fixed ball valves, and elastic single ball valves.
1. Floating ball valve
The ball of a floating ball valve is floating, and under the pressure of the medium, the ball can produce a certain displacement and press tightly against the sealing surface at the outlet end, ensuring the sealing of the outlet end. The structure of a floating ball valve is simple and has good sealing performance, but the ball bears all the load of the working medium and is transmitted to the outlet sealing ring. Therefore, it is necessary to consider whether the sealing ring material can withstand the working load of the ball medium. This structure is widely used for medium and low pressure ball valves.
2. Fixed ball valve
The ball of a fixed ball valve is fixed and does not move under pressure. The fixed ball valve is equipped with a floating valve seat. When subjected to medium pressure, the valve seat moves, causing the sealing ring to press tightly against the ball to ensure sealing. Usually, bearings are installed on the upper and lower shafts of the sphere, with a small operating torque, suitable for high-pressure and large-diameter valves. In order to reduce the operating torque of ball valves and increase the reliability of sealing, oil sealed ball valves have emerged in recent years. They inject specially formulated lubricating bone oil between the sealing surfaces to form an oil film, which enhances sealing performance and reduces operating torque, making them more suitable for high-pressure large-diameter ball valves.
3. Elastic ball valve
The ball of the elastic ball valve is elastic, and both the ball and the valve seat sealing ring are made of metal materials. The sealing pressure is very high, and relying on the pressure of the medium itself cannot meet the sealing requirements. External force must be applied. This type of valve is suitable for high temperature and high pressure media. An elastic sphere is obtained by creating an elastic groove at the lower end of its inner wall. When closing the channel, use the wedge-shaped head of the valve stem to expand the ball and press it against the valve seat to achieve sealing. Release the wedge-shaped head before rotating the sphere, and the sphere will return to its original shape, creating a small gap between the sphere and the valve seat, which can reduce friction and operating torque on the sealing surface.
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