Self-centering sealed three-way regulating valve

Abstract

The invention relates to a self-centering sealing three-way regulating valve which comprises a valve body, a connecting flange, a valve element, a valve rod, an upper valve seat, a sleeve and a lower valve seat. The check valve is characterized in that the upper end of the valve rod penetrates out of the valve body, a valve rod assembly is arranged at the lower end of the valve rod, the valve rod assembly comprises a valve rod ball head, a guide block, a first disc spring, a check block, a second disc spring and a thrust nut, and the guide block and the first disc spring are arranged below the valve rod ball head; a check block and a second disc spring are arranged on the valve rod ball head, a through hole is formed in the middle of the thrust nut, the valve rod penetrates through the through hole, and the thrust nut is fastened on the valve element through threads to connect the valve rod with the valve element. The valve element is prevented from moving up and down relative to the valve rod through pretightening force of the upper and lower disc springs, and the valve opening is kept stable. The valve element and the valve rod can be prevented from integrally swinging under the action of a medium, so that abrasion and position deviation of a sealing surface are avoided; inaccurate flow regulation caused by movement of the valve core can be reduced; and the problem that the three-way regulating valve is difficult to meet the requirement of higher leakage level can be solved.

Description

technical field [0001] The invention belongs to the technical field of valves, in particular to a self-centering and sealing three-way regulating valve. Background technique [0002] The three-way regulating valve is divided into two types: diverter valve and confluence valve. The diverter valve divides one stream of fluid into two streams, and the confluence valve mixes two streams of fluid into one stream. The three-way valve is mainly used for fluid ratio adjustment, temperature adjustment or reversing. To a certain extent, it plays the role of two control valves, has great advantages in reducing costs, and is widely used in actual production. [0003] The three-way valve has three flow channel ports, two in and one out or one out and two in, which makes the three-way valve have two valve cores and valve seat seals. The traditional three-way valve stem is rigidly connected to the valve core, and various dimensional tolerances and shape tolerances will occur during the pr...

AI Technical Summary

Problems solved by technology

The traditional three-way valve stem is rigidly connected to the valve core, and various dimensional tolerances and shape tolerances will occur during the processing of various parts, which have an important impact on the sealing level, and the total cumulative tolerance after the assembly of multiple parts will also make It is difficult for the valve to ensure that the upper and lower seals of the valve core are sealed at the same time. In order to achieve a higher leakage level, it is necessary to have extremely high requirements on the size and shape tolerances of various parts to minimize the cumulative tolerance. Once the parts are processed If the leakage requirement cannot be met in the assembly stage, it needs to be disassembled and assembled again, which is extremely inefficient

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