發布時間：2022-07-14瀏覽量：0
Stainless steel flanged ball valve is a ball valve connected by flanges. Its structure mainly includes floating type, fixed type and elastic type. The characteristics of stainless steel flanged ball valves with different structural forms are also different. The details are as follows:
1. Stainless steel floating flange ball valve
The ball of the ball valve is floating. Under the action of medium pressure, the ball can produce corresponding displacement and press tightly on the sealing surface of the outlet end to ensure the sealing of the outlet end. The stainless steel floating flange ball valve has a simple structure and good sealing performance, but the load of the ball bearing the working medium is all transferred 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.
2. Stainless steel fixed flange ball valve
The ball of the ball valve is fixed and does not move under pressure. Stainless steel fixed flanged ball valves all have floating valve seats. After being pressurized by the medium, the valve seat moves, so that the sealing ring is tightly pressed on the ball to ensure sealing. Bearings are usually installed on the upper and lower shafts with the ball, and the operating torque is small, which is suitable for high-pressure and large-diameter valves. In order to reduce the operating torque of the ball valve and increase the reliability of the seal, oil-sealed ball valves have appeared in recent years. Special lubricating oil is injected between the sealing surfaces to form an oil film, which enhances the sealing performance and reduces the operating torque. , more suitable for high-pressure and large-diameter ball valves.
3. Stainless steel elastic ball valve
The ball of the ball valve is elastic. Both the ball and the valve seat sealing ring are made of metal materials, and the specific pressure of the sealing is very large. This stainless steel flanged ball valve is suitable for high temperature and high pressure media. The elastic sphere is obtained by opening an elastic groove at the lower end of the inner wall of the sphere to obtain elasticity. When closing the channel, use the wedge head of the valve stem to expand the ball and press the valve seat to achieve sealing. Before turning 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 and operating torque of the sealing surface. The ball valve can be divided into straight-through type, three-way type and right-angle type according to its channel position. The latter two ball valves are used to distribute the medium and change the flow direction of the medium.
