Arched Flow Trimming Passages for Smooth Valve Control
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Solution Overview
Problem
Conventional flow rate trimming devices with series of plates and grooves suffer from dead bands that hinder smooth control and weaken the stack under clamping loads, limiting their ability to achieve significant flow rate trimming within restricted dimensions.
Innovation Solution
A flow rate trimming device with convoluted passages featuring annular and radially extending passages of arched form, reducing or eliminating dead bands and enhancing structural strength to withstand clamping loads, while generating additional turbulence for improved flow control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional plates with grooves are used to create flow passages, then flow rate trimming is achieved, but dead bands are formed that hinder smooth control
Solution Approach 1:
The patent applies curvature by forming arch-shaped flow passages instead of conventional straight or angular grooves. The arch-shaped passages eliminate dead bands by providing continuous gradual opening areas throughout the valve movement range, enabling smooth control without abrupt changes or stagnant zones in the flow characteristics.
2Strength
If thick plates are used to maintain isolation between flow passages, then structural strength is improved, but the stack becomes excessively weak under clamping loads
Solution Approach 1:
The arch-shaped flow passages distribute mechanical loads more effectively across the plate structure compared to conventional straight grooves. The curved geometry provides inherent structural reinforcement, allowing thinner plates to withstand clamping loads while maintaining adequate isolation between adjacent flow passages.
Solution Approach 2:
The patent segments the flow passages into multiple arch-shaped channels within each plate. This segmentation allows each passage to be independently optimized for both flow control and structural integrity, reducing the overall material requirements while maintaining strength under clamping loads.
3Strength
If conventional rectangular grooves are used, then manufacturing is simplified, but the body strength is reduced and cannot withstand clamping loads
Solution Approach 1:
The arch-shaped passages are formed using standard metallurgical casting or molding techniques, where the curved geometry is created in a single manufacturing step. This eliminates the need for complex multi-step machining operations that would be required to create equivalent structural reinforcement with straight grooves, maintaining ease of manufacture while significantly improving body strength.
Data Source
AI summary
A flow rate trimming device is described comprising a body 12 defining a plurality of convoluted flow passages 22 extending between a first surface 16a of the body and a second surface 16b of the body 12, wherein at the first surface 16a each flow passage 22 defines an opening 24 having a lower edge and an upper edge, at least part of the lower edge of a first one of the openings 24 being at substantially the same level or lower than at least part of the upper edge of a second one of the openings 24, at least part of the upper edge of the first one of the openings 24 being higher than at least part of the upper edge of the second one of the openings 24.