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A stem sealing structure of an underwater ball valve

A sealing structure and valve stem technology, applied in valve devices, cocks including cut-off devices, mechanical equipment, etc., can solve the problem of difficulty in ensuring the reliability of valve stems and mounting holes, and ensure work safety and sealing reliability. Effect

Active Publication Date: 2020-07-24
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the packing seal in the prior art has great limitations on the working conditions of the ball valve. Under the working conditions of external pressure and high internal pressure of the medium, it is difficult to guarantee the sealing form of ordinary packing seal and separate stuffing box. The reliability of the seal between the valve stem and the mounting hole

Method used

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  • A stem sealing structure of an underwater ball valve
  • A stem sealing structure of an underwater ball valve
  • A stem sealing structure of an underwater ball valve

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Effect test

Embodiment Construction

[0021] As shown in the figure, a valve stem sealing structure of an underwater ball valve includes a valve stem 3 and a valve stem mounting part 2 cooperating with the valve stem. A mounting hole for installing the valve stem is provided on the valve stem mounting part 2. There are three sealing structures between the valve stem 3 and the mounting hole.

[0022] The three sealing structures are the first sealing structure 5 arranged at the junction of the valve stem mounting part 2 towards the end of the valve cavity and the valve stem 3, the second sealing structure 6 disposed near the upper end of the valve stem mounting part 2 and The third sealing structure 7 is provided at the junction between the upper end of the valve stem mounting part 2 and the valve stem 3 .

[0023] The first sealing structure 5 includes an annular projection 501 provided on the valve stem and a thrust washer 502 provided between the annular projection 501 and the end of the valve stem mounting part...

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PUM

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Abstract

A valve rod seal structure of an underwater ball valve comprises a valve rod and a valve rod installing part, and the valve rod and an installing hole in the valve rod installing part are installed in a matched mode; three seal structures are arranged between the valve rod and the installing hole, an elastic energy storage seal ring set is adopted in the second seal structure, two spring energy storage seal ring sets are adopted in the third seal structure, the second seal structure and the third seal structure are installed in a matched mode through a seal cover, one end of the seal cover presses the elastic energy storage seal ring set, an outer flange is arranged at the other end of the seal cover, two annular spaces for placing the two spring energy storage seal ring sets are formed in the upper end face of the outer flange, and a gland used for pressing the two spring energy storage seal ring sets to the elastic energy storage seal ring set through the seal cover is further arranged. Seal reliability of the valve rod of the underwater ball valve can be ensured under the working condition that a medium goes to a low-pressure environment from a high-pressure environment and the medium bears outside pressure, medium leakage is effectively controlled, and work safety of the underwater ball valve is ensured.

Description

technical field [0001] The invention relates to the technical field of underwater pipeline valves, in particular to a valve stem sealing structure of an underwater ball valve. Background technique [0002] For ball valves, between the valve stem and the mounting hole on the bonnet (top-entry ball valve) or the mounting hole on the valve body (side-entry ball valve) and between the flange and the gasket connecting the ball valve and the pipeline The consequences of external leakage are often more serious than the internal leakage between the valve seat and the ball. Therefore, the leakage of valves is an important symbol of civilized production and safe production, and it is also a measure of a country's industrial production management level and technological progress. [0003] The valve stem of the ball valve only rotates, and a stuffing box is used to seal between the valve stem and the mounting hole. The structure is simple, the processing is convenient, and the price is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16K5/06F16K5/08F16K5/20
CPCF16K5/0694F16K5/08F16K5/201
Inventor 李跟飞张新奇蒋鹏
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP