Cylindrical Valve Member Wedge Recess Flow Control
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Solution Overview
Problem
Conventional cone-shaped valve members experience high flow velocities and suction issues during small actuating travel, making sensitive closed-loop control difficult or impossible, and are prone to oscillation, which complicates precise flow rate control.
Innovation Solution
A cylindrical valve member with a wedge-shaped recess and a bore that adjusts flow rates by differential pressures, ensuring reliable and precise control, with a geometry that allows full medium flow even at small rates and reduces oscillation by exposing a smaller flow area to the medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional cone-shaped valve member is used, then the valve structure is simple, but high flow velocities and suction issues occur during small actuating travel, making precise control difficult
Solution Approach 1:
The valve member is segmented into a cylindrical body with a wedge-shaped recess and a separate conical valve seat. This segmentation allows the cylindrical portion to guide flow smoothly while the recess provides a controlled opening area, eliminating the suction effect that occurs with conventional cone-shaped valves during small actuating travel.
Solution Approach 2:
The invention transitions from a purely conical geometry to a three-dimensional structure combining a cylindrical body with a wedge-shaped recess. This dimensional change creates a bore that opens into the recess, allowing flow to be controlled in multiple directions and reducing harmful flow velocities.
2Measurement precision
If a conventional cone-shaped valve member is used, then the structure is simple, but oscillation occurs which complicates precise flow rate control
Solution Approach 1:
By segmenting the valve member into cylindrical and conical portions with a wedge-shaped recess, the invention creates a more stable flow pattern. The cylindrical body provides stable guidance while the recess controls the opening area, reducing oscillation during operation.
3Use of energy by moving object
If a small actuating travel is used to realize low flow rates, then energy consumption is reduced, but high flow velocities appear on the entire periphery of the cone
Solution Approach 1:
The wedge-shaped recess is positioned locally on the cylindrical valve member, concentrating the flow control function in a specific area rather than across the entire periphery. This local quality approach allows low flow rates to be achieved with small actuating travel without creating high flow velocities across the whole valve surface.
4Measurement precision
If a cylindrical valve member with wedge-shaped recess is used, then precise flow rate control is achieved, but the device complexity increases
Solution Approach 1:
The invention merges the cylindrical valve body with the wedge-shaped recess and bore into a single integrated valve member. This combining of features that could have been separate components achieves precise flow control while minimizing the number of parts and assembly steps.
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 valve member enables precise control of flow rates and reduces oscillation, ensuring reliable operation even at low flow rates and preventing suction issues, thereby enhancing the control characteristic and stability of the valve system.
Implementation Method 1
A variable flow rate valve system adjusts the flow rate using the flow medium itself by creating differential pressures that determine the position of a valve member in relation to an associated valve seat
Implementation Method 2
The first and second pilot valves are controlled to selectively open or close the first and second bypasses thereby continuously varying the flow through the flow chamber between a fully open and a fully closed condition
Data Source
AI summary
A variable flow rate valve system adjusts flow rate using the flow medium itself by creating differential pressures that determine a position of a valve member in relation to an associated valve seat. The valve system includes a diaphragm that divides a valve chamber into a control chamber and a flow chamber connected with an inlet. A valve body is connected with the diaphragm and cooperates with a valve seat to modulate flow from the inlet to an outlet and through the flow chamber. A first pilot valve in a first bypass extends between the outlet and the control chamber, and a second pilot valve in a second bypass extends between the inlet and the control chamber. The valves are controlled to selectively open or close respective bypasses to vary the flow through the flow chamber between a fully open and a fully closed condition in response to a control signal.