Butterfly valve

The butterfly valve, designed with an eccentric rotating arm and an inclined contraction vent, solves the problems of valve plate friction and extreme working range control in existing butterfly valves, achieving higher sealing performance, service life, and gas flow control accuracy.

WO2026129380A1PCT designated stage Publication Date: 2026-06-25PIOTECH (SHENYANG) SEMICONDUCTOR EQUIPMENT CO LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
PIOTECH (SHENYANG) SEMICONDUCTOR EQUIPMENT CO LTD
Filing Date
2024-12-23
Publication Date
2026-06-25

AI Technical Summary

Technical Problem

The existing butterfly valve's coaxial structure between the valve plate and valve body causes severe friction between the vent sidewall and the symmetrically rotating valve plate at the closed position, affecting sealing performance and service life. At the same time, it cannot effectively control the gas flow rate in extreme operating ranges.

Method used

The design employs eccentrically positioned main and auxiliary valve plates and an inclined, retractable vent. The drive unit is connected via an eccentric rotating arm and a transmission shaft, enabling off-axis rotation of the main and auxiliary valve plates, reducing friction and improving sealing. Combined with a reduction mechanism and a transmission gearbox, it enhances control precision and stability.

Benefits of technology

This effectively reduces friction between the valve plate and the side wall of the vent, improves the sealing performance and service life of the butterfly valve, avoids gas flow control problems in extreme working ranges, and improves the accuracy and stability of gas flow control.

✦ Generated by Eureka AI based on patent content.

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    Figure CN2024141598_25062026_PF_FP_ABST
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Abstract

A butterfly valve, comprising: a valve body (10), mounted between an air inlet end and an air outlet end of a ventilation line and comprising a main ventilation opening, wherein the side wall of the main ventilation opening is obliquely narrowed toward one end of the main ventilation opening; a main valve plate (20), connected to a transmission main shaft (23) by means of an eccentrically arranged first rotating arm (21) and arranged in the main ventilation opening by means of the transmission main shaft, wherein the main valve plate is divided into a long portion and a short portion by the first rotating arm; and a first driving portion (22), connected to the transmission main shaft and used for rotating in a preset first direction on the basis of a valve-opening instruction, so as to drive, by means of the transmission main shaft and the first rotating arm, the short portion of the main valve plate to rotate off-axis toward the narrowed end of the main ventilation opening, and the long portion of the main valve plate to rotate off-axis toward the opposite end of the main ventilation opening, so as to open the main ventilation opening.
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