Pendulum Valve Sealing Motion to Minimize Seal Wear
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Solution Overview
Problem
Existing valves in analytical instruments face challenges with seal durability due to shear forces, contamination from worn-out seal materials, and complexity in design, particularly in compact applications, where harder seal materials wear out and softer materials are not suited for shear forces, leading to issues with material entrainment and increased part count.
Innovation Solution
A valve design featuring a housing, gate, and traveler with a seal that minimizes shear forces by moving the gate in multiple directions to avoid excess wear, using a single actuation motion for sealing, and incorporating a secondary outlet for purging to reduce pressure and material entrainment, ensuring correct seal placement and compression without secondary actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If harder seal materials are used to withstand shear forces, then seal strength is improved, but seal durability deteriorates due to wear over time
Solution Approach 1:
The patent changes the operational parameters of the seal by eliminating shear forces through a modified valve mechanism. The gate moves perpendicular to the seal surface, and a traveler mechanism with cam surface converts rotational motion to linear motion, ensuring the seal engages and disengages without lateral sliding. This parameter change in motion direction preserves seal strength while dramatically improving durability by preventing wear.
2Duration of action of stationary object
If softer seal materials are used to avoid wear, then seal durability is improved, but seal strength deteriorates because softer materials are not ideally suited for shear forces
Solution Approach 1:
The patent fundamentally changes the motion parameter from lateral sliding to perpendicular movement. The gate body moves linearly along the valve passage axis, and the traveler mechanism ensures the seal is pressed against the seat by a cam surface rather than dragged laterally. This allows softer seal materials to be used effectively, improving durability while maintaining sufficient sealing strength through proper contact pressure.
3Reliability
If multiple actuation motions are incorporated to press the seal closed, then seal engagement is improved, but device complexity increases
Solution Approach 1:
The patent merges the sealing action with the primary gate movement by incorporating a traveler mechanism that converts a single rotational input into both gate positioning and seal compression. The cam surface on the traveler simultaneously guides the gate body and presses the seal against the seat during the same motion cycle, eliminating the need for separate actuation mechanisms while ensuring reliable seal engagement.
4Volume of moving object
If compact form is achieved with shorter passage, then valve size is reduced, but seal durability deteriorates due to increased shear forces in compact design
Solution Approach 1:
The patent changes the motion direction parameter to perpendicular movement, which eliminates shear forces on the seal. This allows the valve to achieve compact dimensions with shorter passage length while maintaining seal durability, as the seal is compressed normal to its surface rather than subjected to lateral sliding forces that would cause wear in traditional designs.
Data Source
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AI summary
A valve can include a housing, a gate (110), and a traveler (116). The housing can include an opening such that material can flow through the opening from the first side to the second side. The gate can be moveable relative to the housing in a first direction between a first gate position and a second gate position. The gate can be moveable relative to the housing in a second direction between the second gate position and a third gate position. The gate can allow material flow through the opening in the first gate position and preventing material flow through the opening in the third gate position. The traveler can be moveable from a first traveler position to a second traveler position. The traveler can be configured to move the gate in the first and second directions as the traveler moves from the first traveler position to the second traveler position.