Irregular wavelike sealing device for valve

Abstract

The invention relates to an irregular wavelike sealing device for a valve. The irregular wavelike sealing device comprises a stuffing box (1) or a guiding box, and is characterized in that an annular groove (3) is arranged on the inner wall of a valve body beside the stuffing box (1) or the guiding box around a valve rod (2); an elastic sealing ring (4) is mounted in the annular groove (3); two head faces of the elastic sealing ring (4) are respectively in surface contact with the upper head face and the lower head face of a valve body sealing cavity body in the annular groove (3), thereby realizing sealing under the elasticity which is generated when the elastic sealing ring (4) is compressed. With adoption of a modularized sealing piece structure, the irregular wavelike sealing device not only solves the problem on sealing the stuffing box (1) of a deep sea valve, but also solves the problem on sealing the guiding box part, thereby effectively preventing the sealing from being damaged in case that a medium enters into the guiding box and the stuffing box (1) to result in the pulling damage or seizure of a shaft part in guiding. Owing to the application of the invention, a maintenance-free use period of the deep sea valve can be ensured for ten years or even longer, and the reliability of the shaft part in sealing and guiding is effectively guaranteed.

Description

Technical field [0001] The invention relates to a special-shaped wave type sealing device for a valve. Background technique [0002] At present, there is no independent research and development of deep-sea valves in China, and foreign deep-sea valve manufacturers are also very limited, and most of them use composite seal packing. During the use of the valve, the existing valve stem packing seal structure and guide seal structure, the stem packing seal and guide easily fail, causing the valve to fail to work normally. When the valve stem moves up and down or rotates, there is a dynamic seal between the valve stem and the packing, and the packing in the stuffing box will eventually fail due to the back and forth movement of the valve stem. Since the guide box is not sealed and protected, impurities and foreign matter in the medium can easily enter the guide box. When the valve stem moves, the guide sleeve will be scratched and worn due to the entered foreign matter and the valve s...

AI Technical Summary

Problems solved by technology

During the use of the valve, the existing valve stem packing seal structure and guide seal structure, the valve stem packing seal and guide are prone to failure, resulting in the valve not working properly

When the valve stem moves up and down or rotates, there is a dynamic seal between the valve stem and the packing, and the stuffing in the stuffing box will wear out due to the back and forth movement of the valve stem and eventually fail.

Since the guide letter has no sealing protection, impurities in the medium can easily enter the guide letter. When the valve stem moves, the guide sleeve will be scratched and worn by the incoming impurities and foreign objects, which will eventually cause the valve stem to jam, and the valve cannot operate.

Since the valves used on land can be repaired in real time, the problems here are not prominent. Valves used in deep sea environments, especially those used in deep sea environments with a water depth of more than 1000 meters, generally require at least 10 to 20 years of maintenance-free

Images