Anti-rotation structure of stuffing box capable of preventing rapid opening or closing ball valve fastening screws from being sheared

Abstract

The invention discloses an anti-rotation structure of a stuffing box capable of preventing rapid opening or closing ball valve fastening screws from being sheared. The structure comprises a valve body, a stuffing box and fastening screws, wherein a stepped hole is formed in the top of the valve body, the stuffing box is installed in the stepped hole, and bosses are machined at the bottom of the stuffing box; grooves are formed in the position, corresponding to the bosses, of the valve body, at least four bosses are uniformly distributed on the circumference of the bosses, and the number of thegrooves is the same as the number of the bosses; pin holes A are machined in the bottom of the stuffing box, the pin holes A are uniformly distributed circumferentially and the pin holes A and the bosses are arranged in a staggered mode; and the number of the pin holes A is at least two, pin holes B are further formed in the position, corresponding to the pin holes A, of the valve body, the number of the pin holes B is the same as the number of the pin holes A, and positioning pins are installed in the pin holes A and the pin holes B. The anti-rotation structure of the stuffing box capable ofpreventing rapid opening or closing ball valve fastening screws from being sheared has the beneficial effects that the stuffing box can be effectively prevented from rotating through groove structures and position pin structures correspondingly, wherein the groove structures are arranged on the bosses of the bottom of the stuffing box and the valve body, and the groove structure are arranged between the bottom of the stuffing box and of the valve body; and the fracture of the fastening screws is effectively prevented, and the occurrence of a stuffing box flying-out event is avoided.

Description

Technical field [0001] The invention relates to a fast opening and closing ball valve, in particular to a stuffing box anti-rotation structure of the fast opening and closing ball valve. Background technique [0002] Under certain working conditions, the valve is required to open and close quickly under the full pressure difference. During the rapid opening and closing process, the valve stem rotates too fast, which causes the valve stem to drive the stuffing box to rotate, and the stuffing box has an impact on the fastening screw each time it is opened and closed. A certain impact force, long-term rapid opening and closing will cause fatigue stress on the fastening screw of the stuffing box. When the fatigue stress reaches a certain value, it will cause the fastening screw to break, and the stuffing box and valve stem will fly out, which is harmful to the safety of personnel. create potential risks. Contents of the invention [0003] In order to overcome the shortcomings...

AI Technical Summary

Problems solved by technology

[0002] Under certain working conditions, the valve is required to open and close quickly under the full pressure difference. During the rapid opening and closing process, the valve stem rotates too fast, which causes the valve stem to drive the stuffing box to rotate, and the stuffing box has an impact on the fastening screw each time it is opened and closed. A certain impact force, long-term rapid opening and closing will cause fatigue stress on the fastening screw of the stuffing box. When the fatigue stress reaches a certain value, it will cause the fastening screw to break, and the stuffing box and valve stem will fly out, which is harmful to the safety of personnel. create potential risks

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