Multi-eccentric three-way half ball valve

Abstract

The invention relates to a ball valve, in particular to a multi-eccentric three-way half ball valve for pipe branch control, comprising a valve body. The upper part of the valve body is connected with a valve cover, and the valve body is internally provided with a valve rod; the lower part of the valve rod is connected with a valve core, the bottom of the valve body is provided with a half shaft which is connected with the valve core; the valve body is provided with an upper port, a lower port and a side port which are all communicated with a valve cavity; the upper port is internally connected with an upper valve seat, and the lower port is internally connected with a lower valve seat; and the valve core comprises two double-eccentric spherical faces, and both the double-eccentric spherical faces are in a 90-degree angle. The multi-eccentric three-way half ball valve is applied to more mediums and complicated industrial and mining conditions such as water, gas (steam, air, natural gas and the like), petroleum refining, oil products, metallurgical slag, serous fluid, particle mediums, dust mediums, multiphase flow and the like.

Description

technical field [0001] The invention relates to a ball valve, in particular to a multi-eccentric three-way hemispherical valve used for pipeline branch control. Background technique [0002] The three-way ball valves currently used are L-shaped or T-shaped three-way ball valves. The above two types of three-way ball valves are opened into through holes at 90° on the ball, and a butterfly spring is installed behind the valve seat. There is a certain elastic force between the spheres. During the opening and closing process of the valve, the spheres rely on the compression deformation of the spring to achieve the sealing specific pressure and achieve the sealing effect. However, the valve seat presses the sphere tightly all the time, the torque is large when the valve is opened and closed, and the operation is heavy. [0003] Common shortcomings and deficiencies of existing three-way ball valves: [0004] (1) The soft sealing structure of the valve: its applicable temperature...

AI Technical Summary

Problems solved by technology

[0005] (2) Even if it is an elastic hard seal structure, its seal is to press the valve seat to the ball by the pre-tightening force. During the opening process of the ball valve, the ball is always pressed by the valve seat and is in a stressed state, so the opening and closing Heavy, large rotational torque, high energy consumption, and short service life

[0006] (3) The three-way ball valve with elastic valve seat is troublesome to manufacture and assemble, and the adjustment takes time

The performance of the valve will be affected if dirt enters the fitting parts. Furthermore, the springs are prone to fatigue, the sealing pair is prone to failure, and the manufacturing cost is relatively high. The flow channel is L-shaped, and when the medium flows through the valve body, it has to turn 90°. Therefore, the flow resistance is large, and the sealing performance is one-way

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