The Material Selection And Form Of High Platform Ball Valve Are Important Factors Affecting Its Sealing Performance
Sanitary Ball Valve and flange gate valve are valves of the same type, the difference is that its closing piece is a ball, and the ball rotates around the center line of the valve body to achieve opening and closing. Ball valves are mainly used in pipelines to cut off, distribute and change the flow direction of the medium. Two-piece ball valves and three-piece ball valves are a new type of valve that is widely used.
The ball of the high-platform ball valve adopts a plug body that can easily rotate 90 degrees. It is easy to operate and plays the role of switching and connecting the medium. The ball support methods of the high-platform ball valve are mainly fixed and floating. The characteristics of these two ball support methods will be introduced below:
1. Fixed ball valve: more suitable for high pressure or large diameter fields; because the ball has a small torque and the valve seat has a small deformation, its sealing performance is stable and the service life is long. The ball of the fixed ball valve is connected to the upper and lower valve stems. The ball can rotate freely along the axis perpendicular to the valve channel and cannot move along the channel axis.
2. Floating ball valve: The valve stem and the ball are movably connected, and the ball has no supporting shaft. The valve seats at both ends of the ball valve are supported, so the ball of the floating ball valve is held flat by the seats at both ends and is in a floating state.
Fixed and floating high-platform ball valves are two widely used types of valve products.
Sealing is very important for high-platform ball valves or any kind of valve. The effect is affected by the sealing performance during use. How to simply share the sealing of high-platform ball valves:
The material selection and form of high-platform ball valves are two important factors affecting their sealing:
1. The common pre-tightening pressure ratio of the sealing seat is about 0.1 nominal pressure, not less than 1.02mpa. The adjustment of the pre-tightening pressure ratio of the sealing seat is determined by the thickness of the sealing gasket. The sealing performance is related to the error size of the gasket thickness and needs to be reasonably adjusted according to the usage.
2. The sealing performance of the ball valve is related to the structure. Different structures produce different sealing effects. Only by selecting suitable tight sealing materials and reasonable structural design can the ball valve have good sealing performance.