Improvement method for internal bypass structure of cut-off valve

Abstract

The invention relates to an improvement method for an internal bypass structure of a cut-off valve. The internal bypass structure of the cut-off valve comprises a valve rod (1), a lock washer (2), a clamping sleeve (3), a valve clack (5), an elastic element (5) and a valve body (7), wherein the valve body is provided with an inlet cavity and an outlet cavity which are vertically crossed; the upper end of the valve rod is external threads and is screwed in the valve body. The improvement method for the internal bypass structure of the cut-off valve has the benefits that an auxiliary valve clack in an existing cut-off valve is deleted, the elastic element is additionally arranged, the elastic element is arranged on the valve rod in a sleeving way and is mounted in the valve clack through the local improvement of the valve rod, the clamping sleeve and the valve clack and in combination with the lock washer matched with the cut-off valve and the elastic element, the clamping sleeve arranged on the valve rod in a sleeving way and the lock washer are screwed in the valve clack through the valve rod, and the valve rod displaces downwardly and can realize the sealing of the outlet cavity of the valve body by the valve clack, and meanwhile, by the arrangement of the elastic element, the flexible connection between the valve rod and the valve clack is realized; rigid connection is changed into flexible connection, so that the opening torque or the closing the torque of the valve rod can be reduced, therefore, the special use demands of a deep diving device are met.

Description

technical field [0001] The invention belongs to the technical field of stop valves, and in particular relates to an improvement method for an internal bypass structure of a stop valve. Background technique [0002] The medium and high pressure stop valve is an important part of the deep submersible used in the drainage system, and the performance of the stop valve directly affects the safety and reliability of the deep submersible. [0003] At present, the internal bypass structure of the stop valve is as follows: figure 1 As shown, the internal bypass structure consists of a valve stem 1, a gasket 2, a ferrule 3, an auxiliary disc 4 and a disc 5. The valve stem 1 is screwed on the valve body through the thread at the upper end, and the valve stem 1 passes through the ferrule. 3 and the gasket are connected with the 2 valve disc 5, the lower end of the valve stem 1 is rigidly connected with the auxiliary valve disc 4, the auxiliary valve disc 4 is used for sealing the main ...

AI Technical Summary

Problems solved by technology

[0004] 1. The auxiliary valve disc 4 is rigidly connected to the valve stem 1, so the auxiliary valve disc 4 is also rigidly sealed to the auxiliary pressure relief hole, and the sealing effect is not ideal;

[0005] 2. Due to the above-mentioned unsatisfactory sealing effect, it is easy to cause unbalanced seawater pressure flowing in from the side wall of the valve body and flowing out from the lower end, inc

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