Pressure Switching Valve Geometry for Low-Hysteresis Snap Action
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Solution Overview
Problem
Pressure-activated valves often exhibit high hysteresis due to frictional and flow forces, leading to undesirable leakage, process cycling, and control variances, which is undesirable for precise fluid control.
Innovation Solution
A pressure actuated switching valve design featuring a valve chamber with staggered inner diameters and a spring-biased valve member, allowing for 'snap-action' transitions between open and closed positions with minimal intermediate dwell time, reducing hysteresis by evenly distributing pressure across different areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If pressure activated valve uses traditional ball valve design, then valve can be passively controlled, but hysteresis increases due to frictional forces, flow forces, and pressure application time
Solution Approach 1:
The valve member is divided into multiple sections (first section, second section, third section) with different diameters positioned at different locations within the valve chamber. Each section experiences different pressure forces, creating a balanced force system that reduces hysteresis while maintaining passive control capability.
Solution Approach 2:
Different sections of the valve member have different diameters (first outer diameter, second outer diameter, third outer diameter) to create localized variations in pressure application. This allows specific regions to experience different forces, optimizing the overall force balance to minimize hysteresis.
2Device complexity
If pressure activated valve uses traditional design, then structure is simple, but control response is slow leading to valve leakage and process cycling
Solution Approach 1:
The valve member is segmented into multiple sections with different diameters, allowing different parts to respond to pressure at different rates. This segmentation enables a more rapid and balanced response to pressure changes, reducing control variances and preventing leakage.
Solution Approach 2:
The valve member geometry is changed by varying the diameters of different sections. This parameter variation optimizes the pressure distribution and force balance, enabling faster response times and reducing the dwell time in intermediate positions.
3Ease of operation
If pressure is applied to move valve ball off seat, then valve opens, but frictional forces and flow forces create high hysteresis
Solution Approach 1:
Different sections of the valve member have different diameters to create localized quality variations. This allows specific sections to experience different pressure forces, balancing the forces acting on the valve member and minimizing frictional and flow forces that cause hysteresis.
Solution Approach 2:
The diameters of different valve member sections are changed to optimize the force balance. By adjusting the first, second, and third outer diameters, the pressure distribution is optimized to reduce hysteresis while maintaining ease of actuation.
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 design achieves low hysteresis, minimizing leakage and control variances, and enhancing response times by ensuring the valve transitions rapidly and consistently between positions.
Implementation Method 1
a spring arranged in the fifth chamber portion, the spring engaging the third section of the valve member, wherein the spring biases the valve member toward the sealing surface
Implementation Method 2
A pressure actuated switching valve design featuring a valve chamber with staggered inner diameters and a spring-biased valve member, allowing for 'snap-action' transitions between open and closed positions with minimal intermediate dwell time, reducing hysteresis by evenly distributing pressure across different areas
Data Source
AI summary
A pressure actuated switching valve includes a first valve chamber including a first chamber portion. The first chamber portion has a first inner diameter, a second chamber portion having a second inner diameter that is greater than the first inner diameter, a third chamber portion having a third inner diameter that is greater than the first inner diameter, a fourth chamber portion having a fourth inner diameter that is greater than first inner diameter, and a valve member. The valve member includes a first section having a first outer diameter that is greater than the first inner diameter. A second section of the valve member has a second outer diameter that is closely matched to the third inner diameter. A third section of the valve member is arranged has a third outer diameter that is greater than the first outer diameter.