Internally Vented Valve Pressure Equalization
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Solution Overview
Problem
Existing two-way valves face issues with pressure equalization and contamination due to the vent hole, which affects their functionality and cleanliness.
Innovation Solution
The valve design includes a central vent passage and two transverse vent passages that manage air transfer between volumes, ensuring proper venting without external contamination by maintaining fluid communication based on the valve's position, eliminating the need for an external vent hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vent hole is drilled from outside the valve body to the internal volume, then air can be vented and pressure can be equalized, but contaminants can enter the valve through the vent hole
Solution Approach 1:
The venting function is segmented into two separate vent passages (first vent passage and second vent passage) located at opposite ends of the spool, rather than using a single external vent hole. This segmentation allows independent control of venting to different chambers and prevents direct external contamination pathways.
Solution Approach 2:
The vent passages are nested within the valve body structure itself, with the first vent passage extending from the first end of the spool to the first chamber and the second vent passage extending from the second end of the spool to the second chamber. This nesting eliminates the need for external vent holes while maintaining internal pressure equalization functionality.
2Reliability
If the valve spool moves in the valve body, then air is sucked into or blown out of the vent hole, but the volume cannot equalize pressure properly without a vent path
Solution Approach 1:
The vent passages are dynamically configured to be in fluid communication with different chambers depending on the spool position. As the spool moves between first and second positions, the first vent passage dynamically connects to the first chamber while the second vent passage connects to the second chamber, enabling continuous pressure equalization throughout the valve's operating range.
Solution Approach 2:
The vent passages act as intermediary channels that mediate pressure equalization between the internal volumes and the external environment without creating direct open pathways for contaminants. The passages provide controlled fluid communication that allows pressure balancing while maintaining system integrity.
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 design ensures the valve functions correctly by managing air distribution between volumes, preventing contamination and maintaining cleanliness by ensuring air is transferred efficiently through internal passages, maintaining the total volume constant and preventing external contaminants from entering.
Implementation Method 1
Air is transferred between the first volume and the second volume as the valve spool moves relative to the valve body through the central vent passage
Implementation Method 2
When the valve is in the actuated position, the first vent passage is not in fluid communication with the first volume, and the second vent passage is in fluid communication with the second volume
Data Source
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AI summary
A valve includes a valve body including a main passage defining a first volume and a second volume. The valve also includes a valve spool moveable relative to the valve body. The valve spool includes a central vent passage capable of fluid communication with each of the first volume and the second volume. Air flows between the first volume and the second volume through the central vent passage as the valve spool moves relative to the valve body and as the valve changes between an actuated position and a non-actuated position.