Ball valve base structure with spring protection mechanism

Abstract

The invention discloses a ball valve base structure with a spring protection mechanism, which comprises a ball body, a valve body and a valve seat arranged on the valve body and matched with the ball body in a sealing mode. A slip cavity is arranged between the valve seat and the valve body, an annular press sleeve is slidingly arranged in the slip cavity, a spring is arranged between the back end of the annular press sleeve and the valve body, and the ball valve base structure further comprises the spring protection mechanism which comprises a spring cylinder and a spring cylinder press cover assembly. A spring cylinder installation hole is arranged on a wall of the valve body corresponding to the back end of the annular press sleeve, the spring cylinder is slidingly arranged in the spring cylinder installation hole, the opening end of the spring cylinder is towards the inside of the spring cylinder installation hole, the spring is installed in the spring cylinder, the outer end of the spring is matched with the spring cylinder press cover assembly in an abutting mode, and the spring cylinder press cover assembly is slidingly matched with the inner wall of the spring cylinder installation hole in a sealing mode. The ball valve base structure with the spring protection mechanism is long in service life and low in maintenances cost.

Description

Technical field [0001] The invention relates to a valve seat structure of a ball valve, in particular to a ball valve seat structure provided with a spring protection mechanism. Background technique [0002] For working conditions where the fluid contains solid media, metal hard-sealed ball valves (see figure 1 ) Is currently the most suitable valve. Ball valves usually have a spring behind the valve seat (as shown by the I mark in the figure). The compression pre-tightening force of the spring can ensure that the seat and the ball of the ball valve can be tightly fitted and sealed. In addition, under different temperatures, the size of the ball valve components will change due to thermal expansion and contraction. In order to prevent the valve from jamming due to the change of the component size, it is usually necessary to install a spring behind the ball valve seat. The spring is usually a cylindrical spiral spring or a disc spring, which compensates for the dimensional change...

AI Technical Summary

Problems solved by technology

The purpose of the valve seat outer section seal 6' located on the outer section of the valve seat is to prevent the solid medium in the fluid from entering and depositing in the spring cavity 51' where the cylindrical helical spring is located, but because the cylindrical helical spring 5' does not The seal 6' of the outer section of the valve seat exerts a pretightening force. In other words, the seal 6' of the outer section of the valve seat is not tightly sealed with the valve body and the valve seat, and the sealing performance is poor. After the valve is used for a long time, solids in the fluid The medium will slowly enter the spring chamber 51' where the cylindrical coil spring is located through the gap between the valve seat and the valve seat where the outer section seal 6' of the valve seat is located, and deposit in the spring chamber 51'. When the solid medium When the spring cavity is full, the cylindrical helical spring 5' loses its ability to adjust deformation. When the temperature changes, especially when the temperature rises, when the size of the valve parts becomes larger, the cylindrical helical spring 5' loses its deformation. The compensation ability will cause the valve parts to be stuck, which will cause the valve to fail to switch.

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