Fixed stainless steel balls have floating seats!
The main valve seat sealing ring material of stainless steel ball valve is Polytetrafluoroethylene (PTFE) It is inert to almost all chemicals, and has the comprehensive characteristics of small friction coefficient, stable performance, difficult aging, wide temperature application range and excellent sealing performance. However, the physical characteristics of PTFE used for sealing Poly stainless steel ball valves, including high expansion coefficient, sensitivity to cold flow and poor thermal conductivity, require that the design of valve seat sealing must be carried out around these characteristics.
plastic materials for valve seat sealing also include filled polytetrafluoroethylene, nylon and many other materials. However, when the sealing material hardens, the reliability of the sealing will be destroyed, especially in the case of low dropout. In addition, synthetic rubber such as nitrile rubber can also be used as valve seat sealing material, but its applicable medium and temperature range are limited. In addition, if the medium is not lubricated, it is easy to jam the sphere with synthetic rubber. The structure of stainless steel flanged ball valve is simple. Generally, the sealing ring is movable and convenient to disassemble and replace; When fully open or fully closed, the sealing surface of the sphere and the valve seat is isolated from the medium. When the medium passes through, it will not cause erosion of the valve sealing surface and has a wide application range.
fixed stainless steel ball valves all have floating valve seats. After being subjected to medium pressure, the valve seats move. The sealing ring is tightly pressed on the ball to ensure sealing, usually, bearings are installed on the upper and lower shafts of the ball, and the operating torque is small, which is suitable for high-pressure and large-diameter valves. However, in order to reduce the operating torque of the ball valve and increase the reliability of the seal, the oil seal ball valve is added to inject 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 large-diameter ball valves.
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