Anti-looseness fixing device for connecting butterfly board and valve seat of butterfly valve

Abstract

The invention relates to an anti-looseness fixing device for connecting a butterfly board and a valve seat of a butterfly valve. The anti-looseness fixing device comprises an outer cylinder and an inner cylinder which are fixedly arranged together, a hole is formed in the bottom of the inner cylinder, an outer annular flanging is arranged at the opened end of the upper portion of the outer cylinder, and an inner annular flanging is arranged at the opened end of the upper portion of the inner cylinder. The inner flanging and the outer flanging are both annular. Compared with a traditional inner flanging and a traditional outer flanging, the contact area between the inner flanging and a corresponding component and the contact area between the outer flanging and a corresponding component are larger, and the anti-looseness fixing device is better in anti-looseness effect and prevents the valve from being loosened even in a severe environment.

Description

technical field [0001] The invention relates to the technical field of butterfly valve manufacturing, in particular to an anti-loosening fixing device for connecting a disc seat of a butterfly valve. Background technique [0002] Conventional hexagon socket head screws are used for the connection between the existing butterfly valve and the pressure ring of the butterfly plate, and an elastic washer is added under the screw. This structure can prevent the screw from loosening under the condition of less vibration. Under some special working conditions, such as severe fluid scouring the butterfly plate, large vibration of the valve, and fast closing speed of the suction butterfly valve, the structure will also become loose, which will have a certain impact on the performance of the valve. [0003] For this reason, the patent No. 2011204604445 provides an anti-loosening fixing device for the butterfly plate locking screw of a butterfly valve. Its structural form includes an ou...

AI Technical Summary

Problems solved by technology

[0004] The above structural form has the following defects. Because the number of inner and outer flanges is two, and because it cannot form the entire surface contact with the corresponding screw and disc pressure ring, the compression effect needs to be further ideal. Using a section After a period of time, there will be looseness, which will have a certain impact on the performance of the valve.

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