Curved Plate Rotary Valve Shutter for Noise and Cavitation Control
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Solution Overview
Problem
Current rotary adjustment valves face limitations in noise attenuation and cavitation control due to physical constraints on the number of plates that can be installed, which restricts their performance under severe pressure conditions and reduces their maximum capacity.
Innovation Solution
A shutter for rotary valves featuring curved plates with a constant radius of curvature, which allows for increased pressure division and noise reduction without compromising the valve's capacity, by optimizing the arrangement of openings and their cross-sectional area based on fluid type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the number of plates is increased to improve noise attenuation and cavitation control, then noise level and cavitation are reduced, but the maximum capacity (Cv/Kv) of the valve is compromised
Solution Approach 1:
The shutter is divided into multiple plates (typically 3-7 plates) arranged in series within the spherical cavity. Each plate contains multiple openings that segment the fluid flow into separate paths, creating multiple stages for pressure division. This segmentation allows noise and cavitation control while maintaining adequate flow capacity through optimized opening distribution across all plates.
Solution Approach 2:
Each plate is designed with specific local characteristics including varying numbers of openings, different opening geometries (holes or slits), and customized patterns according to manufacturer specifications. The local quality of each plate can be optimized for specific functions such as noise reduction in certain regions while maintaining flow capacity in others, allowing tailored solutions for severe process conditions.
2Object-affected harmful factors
If the number of holes in each plate is increased to reduce cavitation effect, then cavitation is attenuated, but the jet diameter decreases and flow capacity is reduced
Solution Approach 1:
The total flow capacity is distributed across multiple plates, each containing multiple openings. By segmenting the flow path through several plates with multiple openings each, the cavitation effect is reduced through increased peak frequency and velocity control, while the cumulative flow capacity across all plates maintains or enhances the valve's maximum Cv/Kv rating.
Solution Approach 2:
The openings in each plate can have various geometries including holes or slits with different orientations and patterns. This dimensional variation in opening geometry allows optimization of both cavitation resistance and flow capacity by distributing flow across multiple dimensions and paths rather than relying on a single large opening.
3Object-affected harmful factors
If more sophisticated valves are used to control velocities and limit kinetic energy, then cavitation and noise are reduced, but the maximum capacity is significantly reduced due to obstruction
Solution Approach 1:
The shutter plates are designed to rotate with the ball, providing dynamic flow control. At low flow rates, the plates present greater resistance and require higher head, while at high flow rates when the valve is open, the plates offer minimum resistance. This dynamic behavior allows velocity control for cavitation and noise reduction while maintaining high maximum capacity when fully open.
Solution Approach 2:
The velocity control and kinetic energy limitation are applied partially through the plate openings rather than through complete obstruction. The plates provide sufficient velocity control to reduce cavitation and noise while maintaining adequate flow capacity, avoiding the excessive action that would require full obstruction and significantly reduce maximum capacity.
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 solution maintains high flow coefficients, increases peak frequency, reduces noise, and enhances recovery factors, providing better cavitation resistance and noise attenuation without requiring structural modifications to the existing valves.
Implementation Method 1
The purpose of these plates is to divide in various stages the rise in pressure that the fluid, be it liquid or gaseous, undergoes as it passes inside the shutter
Implementation Method 2
velocity control inside the trim or shutter
Implementation Method 3
division of the confined flow into a number of paths
Implementation Method 4
increase in peak frequency
Implementation Method 5
the greater the attenuation of the aerodynamic noise level
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A shutter for a rotary valve, comprising: a main body (2), having a substantially spheroidal conformation or suitable for rotating about an axis and equipped with a through cavity (3); at least one plate (4), provided with a plurality of through holes (5) and arranged inside the through cavity (3). The plate (4) has a curved conformation.