A tight-fitting key and a sealing auxiliary device for damping vibration in butterfly valves
By using a tight-fitting key and butterfly valve auxiliary device, the vibration and noise problems in the flat key connection were solved, achieving stable operation and extended service life of the equipment, and improving the sealing performance and flow control accuracy of the butterfly valve.
CN224283482UActive Publication Date: 2026-05-26TAISHAN NUCLEAR POWER JOINT VENTURE CO LTD
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Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TAISHAN NUCLEAR POWER JOINT VENTURE CO LTD
- Filing Date
- 2025-05-30
- Publication Date
- 2026-05-26
AI Technical Summary
Technical Problem
The existing flat key connection has gaps that cause vibration and noise, affecting the equipment's lifespan and operational stability.
Method used
The valve employs a tightly connected key structure, including a flat key and a tensioning section. The tensioning section gradually extends or approaches along the axis to form a conical or polygonal structure, increasing the interference fit to reduce clearance. In the butterfly valve, a fixing block and locking element are used for fixation, reducing vibration and noise.
Benefits of technology
It effectively reduces vibration and noise, extends equipment lifespan, improves connection stability and safety, and enhances the sealing performance and flow control accuracy of butterfly valves.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN224283482U_ABST
Abstract
This utility model discloses a tight-fitting key and a sealing auxiliary device for reducing vibration in butterfly valves. The tight-fitting key includes: a flat key for installation in a keyway of one workpiece and a tensioning part for installation in a keyway of another workpiece that mates with the first workpiece. The tensioning parts are stacked on the non-working surface of the flat key. Each tensioning part includes a tensioning section that gradually extends outward from the non-working surface of the flat key along its axis; and / or the tensioning section gradually approaches the working surface of the flat key along its axis. This allows the tensioning section to be tensioned in the keyway of the other workpiece, resulting in a tighter connection. This reduces vibration when one workpiece drives the other to rotate circumferentially, reduces noise during operation, provides some protection for the equipment, and extends its service life.
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