Fixed ball valve is a new generation of high-performance ball valve, suitable for long-distance pipelines and general industrial pipelines. Its strength, safety, and harsh environment are specially designed at the time of design, and it is applicable to various corrosive and non-corrosive media. . Next Xiaobian introduced the classification of ball valves and the advantages of fixed ball valves.
Ball valve classification
1. Floating ball valve: The ball of the ball valve is floating. Under the effect of 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 ball valve is simple and the sealing is good. However, the load of the ball bearing the working medium is all 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 in low and medium pressure ball valves.
2. Fixed ball valve: The ball of the ball valve is fixed and does not move after being pressed. The fixed ball ball valve has a floating valve seat. After the medium pressure, the valve seat moves and the seal ring is pressed against the ball to ensure the seal. Bearings are usually mounted on the upper and lower shafts 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 ball valve and increase the degree of sealability, oil seal ball valves have appeared in recent years. The special lubricants are pressed between the sealing surfaces to form a layer of oil film, which enhances the sealing performance and reduces the operation. Torque, more suitable for high pressure large diameter ball valve.
3, elastic ball valve: ball valve ball is elastic. The ball body and the valve seat seal ring are made of metal materials, and the specific pressure of the seal is very large. According to the pressure of the medium itself, the pressure cannot reach the sealing requirement, and an external force must be applied. This valve is suitable for high temperature and high pressure media. The elastic ball is to open a flexible groove at the lower end of the inner wall of the ball to obtain elasticity. When closing the channel, use the wedge head of the valve stem to make the ball expand and seal with the valve seat. Loosen the wedge head before turning the ball, 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 and operating torque of the sealing surface.
Fixed ball valve advantage
1. Sealed emergency grease injection rescue: due to foreign material or fire in the medium, the valve seat seal is accidentally ineffective. The grease injection valve provides quick connection with the grease gun and can quickly and easily inject the sealing grease into the valve seat seal to relieve the leakage. .
2. Reliable stem seal and low operating torque: In addition to the standard seal ferrule, an “O†type seal ring is also installed on the packing gland. The double seal guarantees the reliability of the stem seal; additional graphite packing and Sealant injection minimizes stem leakage after a fire. Valve stem bearings and thrust bearings make the valve easy to operate.
3, full diameter or reduced diameter: According to the need to use full diameter or reduced diameter structure. Full-diameter valve The flow orifice is the same as the inner diameter of the pipeline, facilitating the cleaning of the pipeline.
4, the stem can be lengthened: According to the needs of installation or operation, the valve stem can be extended. The extended stem ball valve is particularly suitable for applications where underground pipelines, such as city gas, need to be laid. Extended stem size is determined according to customer needs.
5. Flexible operation: The use of valve seats and stem bearings with small friction coefficient and good self-lubrication greatly reduces the operating torque of the valve. Therefore, the valve can be operated freely for a long period of time even without providing a sealed grease.
Fixed ball valve application range
The fixed ball valve is applicable to various pipelines of Class 150 to Class 1500, PN16 to PN100, JIS 10K to JIS 20K, and the applicable temperature is -196 to 350°C. It is used to cut off or connect the medium in the pipeline and uses different materials. They are suitable for conveying water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea, etc. They are widely used in petroleum refining, long-distance pipelines, chemicals, papermaking, pharmaceuticals, water conservancy, electricity, municipal, steel and other fields. The fixed ball valve is driven by worm gear, manual, pneumatic or electric. Fixed ball valves are generally flanged or butt welded.
Editor's summary: The classification of the ball valve and the advantages of the fixed ball valve are introduced here. I hope to help everyone. If you want to know more related information, you can pay attention to this website information.
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