Novel butterfly valve

Abstract

The invention relates to a novel butterfly valve. The novel butterfly valve comprises a valve body (1) and a shaft (2), wherein a valve plate (3) is mounted on the shaft (2); a bottom plug (9) is mounted on the valve body (1) at the bottom of the shaft (2); the novel butterfly valve is characterized in that a part, near the valve body (1), of the shaft (2) is sleeved by a composite bush (6); a locating slot is formed in the shaft (2) in the valve body (1); an anti-thrust key (7) is mounted in the locating slot; an anti-thrust gasket (8) is mounted on a part, near the bottom of the shaft (2), of the bottom plug (9). Through the adoption of the anti-thrust gasket and the anti-thrust key, the axial movement amount of the valve plate part is effectively limited; meanwhile, a reasonable fit clearance is designed, so that a sealing ring and a valve body sealing surface are self-aligned in the rotation process of the valve plate, thereby effectively protecting a sealing pair, avoiding the damage to the sealing ring and the valve body sealing surface in the operation process of the valve, avoiding internal leakage caused by the damage to the sealing ring and the valve body sealing surface, and improving the sealing performance of the butterfly valve.

Description

technical field [0001] The invention relates to a novel butterfly valve. Background technique [0002] During the rotation process of the existing butterfly valve plate, the valve plate components composed of the valve plate, shaft, pressure ring and sealing ring will move downward due to gravity; at the same time, there is a medium in the gap between the bottom end surface of the shaft and the bottom plug. When the axial movement exceeds a certain value, the sealing ring and the sealing surface of the valve body will be subjected to axial uneven force and squeeze each other, causing damage to the sealing ring and the sealing surface of the valve body. Cause internal leakage of the valve. Therefore, an axial limit structure must be designed to limit the axial movement of the valve plate components. [0003] The axial limit structure of the existing butterfly valve plate is as follows: two inverted holes are designed at the axial position of the inner hole of the valve body...

AI Technical Summary

Problems solved by technology

When the butterfly valve is assembled, it is difficult to accurately measure the position error of the reference plane. In order to make the horizontal reference plane of the center of the sealing ring coincide with the horizontal reference plane of the center of the valve body, the thickness of the upper and lower thrust rings is repeatedly adjusted by manually observing the position of the center of the valve plate. , each adjustment requires disassembly of the valve plate, shaft, pressure ring, and sealing ring, resulting in low assembly accuracy and low assembly efficiency; at the same time, when processing the upper and lower thrust ring holes of the valve body, the tool is pulled backwards, which results in low processing efficiency and low size. Accuracy is difficult to control

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