Valve Stem O-Ring Retainer for Leakage Prevention
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Solution Overview
Problem
Bar gun assemblies experience undesirable leakage due to the O-ring becoming unseated or cocked at an angle during operation, allowing fluid to escape between the stem guide walls and the valve stem.
Innovation Solution
An O-ring retainer is integrated with the valve stem, featuring a disk projection or finger projections that move with the valve stem to maintain the O-ring in its normal seated position, preventing leakage by ensuring the O-ring remains aligned and seated against the valve stem chamber walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the O-ring is used to seal the valve stem chamber, then fluid leakage is prevented, but the O-ring becomes unseated or cocked during operation causing leakage
Solution Approach 1:
An O-ring retainer is introduced as an intermediary component between the O-ring and the valve stem chamber. This retainer includes a projection that engages with the O-ring to prevent it from becoming unseated or cocked during operation, thereby maintaining sealing reliability while ensuring positional stability.
Solution Approach 2:
The O-ring retainer is pre-positioned on the valve stem to establish a guide structure before the O-ring is installed. This preliminary arrangement ensures that the O-ring is properly oriented and constrained during assembly and subsequent operation, preventing misalignment and leakage.
2Productivity
If the valve stem is actuated repeatedly, then the valve functions properly, but the O-ring becomes displaced from its seated position
Solution Approach 1:
The O-ring retainer acts as a mediator that remains engaged with the O-ring during repeated valve actuations. The projection on the retainer continuously guides the O-ring back to its correct position, ensuring sealing consistency even after multiple cycles of valve operation.
Solution Approach 2:
The O-ring retainer is designed to automatically return the O-ring to its proper position during each valve actuation cycle without requiring external intervention. The mechanical engagement between the retainer projection and the O-ring provides self-correcting functionality that maintains sealing integrity throughout operation.
Data Source
AI summary
An O-ring retainer is disclosed that is integral with a valve stem of a valve. The valve is intended to move in a valve chamber, which valve chamber has a fluid inlet and a fluid outlet. When manually actuated, the valve moves between a first position, where it is seated against walls of the valve chamber and prevents flow through the chamber, and a second unseated position where it allows flow of the fluid through the chamber between the inlet and the outlet. An O-ring, used in conjunction with the valve and the valve chamber, is maintained in place by an outward projection from the valve stem, which projection is located just below the normally seated O-ring. Thus, if the O-ring becomes unseated, the projection, upon movement of the valve towards the seated position, bumps the O-ring back into its normal position.