Equal Percentage Flow Disk Valve Wall Depression Design
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Solution Overview
Problem
Existing disk valves in process control systems often lack precise control over fluid flow, particularly at low flow rates, as they typically exhibit either linear or quick-opening fluid flow characteristics, failing to provide consistent percentage increases in flow rate as the valve transitions from closed to open positions.
Innovation Solution
The design incorporates a valve disk with a protruding wall featuring an outer surface and depression, which provides a substantially equal percentage fluid flow characteristic by adjusting the flow rate, ensuring consistent percentage increases in flow capacity for equal increments of rotation, thereby enhancing control resolution at low flow rates and rapid increase at high flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional disk valve with a simple disk structure is used, then the device complexity is low, but the fluid flow control precision is insufficient
Solution Approach 1:
The patent applies local quality by modifying only specific regions of the disk structure. The wall protrusion with depression is added locally to the disk body, while the rest of the disk maintains its simple structure. This localized modification creates the equal percentage flow characteristic without requiring complete redesign of the entire valve, thus improving flow control precision while minimizing increase in device complexity.
Solution Approach 2:
The patent changes the geometric parameters of the disk structure by adding a wall protrusion with a specific depression profile. This geometric parameter change alters the flow area as a function of disk rotation angle, transforming the flow characteristic from linear/quick-opening to equal percentage. The depression depth and shape are specifically designed to achieve the desired flow coefficient variation with rotation angle.
2Manufacturing precision
If a conventional disk valve structure is used, then the ease of manufacture is high, but the control resolution at low flow rates is insufficient
Solution Approach 1:
The wall protrusion with depression is implemented as a localized feature on the disk, concentrating the precision requirements to a specific region rather than the entire disk. This allows standard manufacturing processes to be used for the bulk of the disk while applying higher precision machining only to the wall protrusion area, achieving improved control resolution at low flow rates with moderate impact on manufacturing complexity.
3Stability of the object's composition
If the disk transitions from closed to open position with linear characteristic, then the device complexity is low, but the fluid flow characteristic consistency is poor
Solution Approach 1:
The patent transforms the flow characteristic parameter from linear/quick-opening to equal percentage by modifying the disk geometry. The wall protrusion with depression creates a specific relationship between disk rotation angle and flow area, ensuring that equal increments of rotation produce equal percentage increases in flow coefficient. This provides consistent fluid flow characteristic throughout the entire travel range from closed to open position.
Data Source
Figure 1A~1B
Figure 2A~2C
Figure 3
AI summary
Disk valves to provide an equal percentage fluid flow characteristic are disclosed. An example apparatus includes a disk body (102), a sealing surface (108) of the disk body to form a seal with a valve body in a closed position, and a wall (120) protruding from the disk body. The wall includes an outer surface (122) adjacent a portion of the sealing surface and a depression (126) defined by the outer surface of the wall. The outer surface and the depression provide a substantially equal percentage fluid flow characteristic when the disk body transitions between the closed position and an open position.