Author:Site Editor Publish Time: 2018-11-14 Origin:Site
The ball of the floating ball valve is floating without a mounted shaft. Under the action of the medium pressure, the ball can generate a certain displacement and press on the sealing ring at the outlet end to ensure the sealing of the outlet end, which is a single-sided forced seal.
The design of floating ball valve should focus on whether the sealing material can withstand the medium acting load of the sphere, because the load of the sphere subjected to the working medium is all transmitted to the outlet sealing ring. Therefore, the floating ball structure is widely used for the medium and low pressure ball valves.
The ball of the floating ball valve is floating. Under the effect of the medium pressure, the ball can strike a certain displacement and press on the sealing surface at the outlet end to ensure the sealing of the outlet end.
The floating ball valve is small in size, light in weight, simple in structure and good in sealing. However, the load of the ball receiving the working medium is completely transmitted to the outlet sealing ring, so it is necessary to consider whether the sealing ring material can saturate the working load of the spherical medium.
Floating ball valve features and functions
The utility model has the advantages of small volume, light weight and simple structure, and the ball has a free floating function, which can better ensure the sealing; the ball valve uses a ball with a circular through hole as the opening and closing member, and the ball is driven around the center of the valve stem by the valve stem. 0~90 degree rotation, complete the function of opening and closing; with the characteristics of compact structure and agility, rolling 90 degrees, the valve can be closed and the pipeline medium can be blocked; the diameter of the ball passage is the same as the diameter of the pipeline, the flow resistance is small, and the circulation can be large; The valve stem is a bottom-loading type, which eliminates the occurrence of the valve stem and ensures the safety of operation.
The main feature of the floating ball valve is that the ball has no support shaft, and the ball is supported by the valve seat at both ends of the valve inlet and outlet, and the valve stem and the ball are connected in an active manner. The ball of such a ball valve is held in a "floating state" by the two valve seats.
The ball can be freely rotated between the two seats by means of a valve stem by means of a handle or other drive.When the flow passage hole of the sphere is aligned with the valve passage hole, the ball valve is opened, the fluid is unblocked, and the fluid resistance of the valve is minimized. When the ball is rotated by 90 °C, the flow passage hole of the sphere is perpendicular to the valve passage hole, and the ball valve is closed. The ball is pushed to the valve outlet end (referred to as the valve after the valve seat) under the action of the fluid pressure, so that the pressure is pressed.