Run Selector Biasing for Independent Valve Body Sealing
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Solution Overview
Problem
Existing run selector systems face issues where an obstruction in one valve body can prevent full movement of all valve bodies linked by a shared control mechanism, leading to incomplete rotation, fluid pressure cross-talk, and incorrect commodity distribution.
Innovation Solution
Incorporating a biasing system with predetermined backlash between the common drag link and valve bodies, and using resilient members to bias valve bodies into desired positions, ensuring independent movement and sealing even if one valve is obstructed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a shared control mechanism links multiple valve bodies together, then ease of operation is improved, but reliability deteriorates when one valve is obstructed
Solution Approach 1:
The patent introduces independent biasing elements for each valve body that can operate autonomously. When one valve body is obstructed, its biasing element can still function independently to restore proper positioning, while other valve bodies continue to operate normally through their own biasing elements. This segmentation isolates the failure impact from propagating through the entire system.
Solution Approach 2:
The patent modifies the mechanical parameters of the control linkage by introducing deliberate clearance or play between the drag link and valve body interfaces. This parameter change allows individual valve bodies to move independently when needed to overcome obstructions, while still maintaining coordinated control under normal operating conditions.
2Device complexity
If valve bodies are linked by a common drag link, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent intentionally introduces clearance or play in the mechanical interfaces between the drag link and valve bodies. This deliberate parameter change reduces the manufacturing precision requirements for the linkage components, allowing for easier fabrication and assembly while still achieving reliable coordinated control of multiple valve bodies.
3Reliability
If biasing elements are added to each valve body, then reliability is improved, but device complexity increases
Solution Approach 1:
The biasing elements are designed to be self-actuating components that automatically restore valve bodies to their correct positions when obstructions occur. Each valve body has its own spring-loaded biasing mechanism that requires no external control or adjustment, eliminating the need for complex control systems while maintaining high reliability.
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
This solution allows each run selector device to move independently to its desired position, preventing obstruction from affecting others and maintaining proper sealing, thus ensuring accurate and efficient commodity distribution.
Implementation Method 1
a resilient member disposed between the control arm member and the valve body member, wherein the resilient member is selectively compressible between the first and second interface elements to permit limited relative movement between the control arm member and the valve body member
Implementation Method 2
The first and second biasing elements are mutually biased against each other to urge each other apart and towards a one or the other of the opposite first and second biasing system positions
Data Source
AI summary
A biasing system for use with an associated run selector device includes a valve body member movable within a housing between opposite first and second run selection positions selecting respective first and second commodity distribution runs of the associated run selector device. The biasing system includes a first biasing element on the housing, and a second biasing element on the valve body member. The first and second biasing elements are movable relative to each other between opposite first and second biasing system positions together with the associated valve body member being moved relative to the housing between the opposite first and second run selection positions. The first and second biasing elements are mutually biased against each other to urge each other apart and towards a one or the other of the opposite first and second biasing system positions.