A rotary return valve

Abstract

The invention relates to a rotary reflux valve. The rotary reflux valve comprises a valve body, a valve plate, a valve rod and a spring, wherein the valve plate, the valve rod and the spring are arranged in the valve body; a medium passage is formed in the valve body, annular protrusions are coaxially arranged on the inner wall of the medium passage, and the outer wall of the valve plate is fitted with the inner walls of the annular protrusions; the valve plate is fixedly mounted on the valve rod, the valve rod and the valve body are in rotary connection, the valve rod and the annular protrusions are axially staggered and parallel, and an eccentric distance is formed between the center line of the valve rod and the axis of the valve plate as well as the axis of the annular protrusions; two ends of the spring are respectively fixed on the valve plate and the valve body; and the valve body comprises a reflux opening, windows A are formed in the side walls of the top of the valve rod, the windows A are communicated with or are not communicated with the reflux opening, a hole is formed in the valve body, one end of the hole is communicated with the windows A, and the other end of the hole is communicated with a valve inlet of the medium passage. According to the rotary reflux valve disclosed by the invention, the opening and closing manner of the valve plate is rotary movement, when the valve normally operates without reflux, reflux leak is greatly reduced, the properties of the valve are improved, and the rotary reflux valve is suitable for pump systems with high requirements.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a rotary return valve. Background technique [0002] The reflux valve is installed at the outlet of the centrifugal pump, and has the functions of check, automatic reflux, automatic flow detection, and reflux decompression. When the centrifugal pump is shut down, the disc of the return valve is automatically closed to prevent the medium from flowing backwards, avoiding damage to the centrifugal pump due to the reverse rotation of the impeller; Return to the inlet of the centrifugal pump for recirculation, so that the actual flow of the centrifugal pump is greater than its necessary minimum flow. Return valves are widely used in centrifugal pump systems that need to operate in small flow conditions to protect the safety of centrifugal pumps. [0003] In the existing backflow valve, the valve disc moves linearly along the pipeline axis, and the position of the valve disc determine...

AI Technical Summary

Problems solved by technology

The structure of the existing backflow valve is complicated, and it is very difficult to manufacture; the structure length is very long and the volume is large; the manufacturing cost is very high, which seriously affects the popularization and use of the product

At the same time, in order to ensure the reliability of the rectilinear movement of the valve disc, there is a large gap between the valve stem and the bushing, which will lead to increased backflow leakage when the valve is in normal operation (no backflow required), and in some pump systems with higher requirements will not work properly

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