Butterfly Valve Diffuser Structure for Quiet Precise Flow Control
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Solution Overview
Problem
Conventional butterfly valves experience noise and vibrations, and excessive flowrate variation when the valve disc is opened at a small degree, making precise control difficult due to their linear flow characteristics rather than equal percentage curves.
Innovation Solution
A control butterfly valve design incorporating a diffuser with a passing hole and passing part to reduce pressure gaps between the inlet and outlet, and eddy-producing parts on the valve disc to manage fluid flow and pressure, transforming the flowrate characteristic from linear to equal percentage, thereby reducing noise and vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the valve disc is opened at a small degree to control flowrate, then flowrate control is achieved, but noise and vibrations increase significantly
Solution Approach 1:
A diffuser is introduced as an intermediary component between the valve disc and the downstream side. The diffuser includes a passing hole that allows fluid to pass through at a reduced pressure, and a passing part with multiple holes that further distributes and reduces fluid pressure. This intermediary structure prevents direct high-velocity fluid impact on the valve disc at small opening degrees, thereby reducing noise and vibrations while maintaining flowrate control capability
Solution Approach 2:
The diffuser changes the pressure parameter of the fluid passing through the valve. By creating a pressure reduction zone in the diffuser body with its passing hole and passing part, the fluid pressure is gradually reduced before reaching the valve disc area, transforming the harmful high-pressure, high-velocity flow into a lower-pressure, quieter flow regime
2Quantity of substance
If the valve disc is opened at a small degree, then precise flowrate control is attempted, but excessive flowrate variation occurs due to linear characteristics
Solution Approach 1:
The diffuser structure changes the pressure-flow relationship parameter of the valve system. By introducing the pressure reduction effect through the passing hole and passing part, the overall flow characteristic transforms from linear to equal percentage curve, enabling precise flowrate control even at small opening degrees without excessive flowrate variation
3Object-affected harmful factors
If a diffuser with passing hole and passing part is added, then noise and vibrations are reduced, but device complexity increases
Solution Approach 1:
The diffuser is designed as an integrated component that combines multiple functions: it serves as both a noise-reduction device and a flow control element. The passing hole and passing part are merged into a single diffuser body structure, eliminating the need for separate noise-reduction components and minimizing overall device complexity while achieving the desired noise and vibration reduction
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The control butterfly valve effectively suppresses noise and vibrations while allowing precise control of flowrate, even at low opening degrees, by distributing fluid pressure efficiently and reducing pressure gaps, making it suitable for use as a control valve in smaller piping.
Implementation Method 1
Eddy producing parts may be formed in an upper part and a lower part of the valve disc to create an eddy of the fluid
Data Source
AI summary
A control butterfly valve comprises a valve body having a fluid passage through which a fluid flows, a valve disc controlling an opening and closing of the fluid passage of the valve body, and a diffuser including a passing hole configured to allow the fluid, which passes through the valve disc, to pass therethrough and a passing part configured to allow the fluid, which passes through the valve disc at a low speed, to pass therethrough.