Sleeve type automatic control return valve

Abstract

The invention discloses a sleeve type automatic control return valve. According to the sleeve type automatic control return valve, a shell of the automatic control return valve is of a three-way structure composed of a valve deck and a valve body. A main path valve cavity communicating with a main path inlet and a main path outlet and a bypass valve cavity connecting the main path inlet and a bypass outlet are formed in the shell. A check valve is installed in the valve body. A main path spring is installed between the check valve and the valve deck. A sleeve is installed in the valve body. Avalve rod is connected with the upper end of a valve cylinder. According to the sleeve type automatic control return valve, an orifice is located in a fixing piece sleeve, a main path check valve is not affected by changes of the flow speed and the flow direction of a medium at the orifice when moving, action is smooth, and stability is high. On the basis of a sleeve type automatic control returnvalve, by adding or modifying internal parts, the functions of no bypass leakage, on-line adjustment, multi-stage pressure reduction, upper guide and the like can be achieved.

Description

technical field [0001] The invention relates to a sleeve type self-control return valve, which belongs to the technical field of protection valves. Background technique [0002] After the self-controlled return valve is applied to the centrifugal pump, it will automatically protect the centrifugal pump to prevent cavitation, vibration and noise due to the low flow rate in the pump, ensure the safe and stable operation of the pump, and prolong the service life of the pump. The automatic control return valve is a three-way valve. The valve inlet is connected to the pump outlet. After the medium passes through the valve, it can be divided into two channels to flow out. The main channel outlet is connected to the subsequent process pipeline, and the bypass outlet is connected to the medium storage tank. [0003] The existing low-pressure self-control return valve structure, such as the return valve structure disclosed in the utility model patent CN 202926598 U, is provided with ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem of the present invention is: to overcome the deficiencies of the prior art, to provide a sleeve-type self-control backflow valve, which solves the problem of unstable movement of the check valve due to the change of medium flow velocity and flow direction, and improves the reliability of the valve.

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