Retaining Ring Geometry for Low-Force Valve Disassembly
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Solution Overview
Problem
Existing retaining rings in flow control devices require high force for disassembly, which can damage valve components, and reducing their size to lower the force required compromises the coupling between the bonnet and cage, leading to misalignment and undesirable movement.
Innovation Solution
A retaining ring design with an interior and exterior side, featuring a cavity and angled surfaces that allow for a snap-fit connection and reduced shear area, facilitating disassembly while maintaining alignment and stability between the bonnet and cage components, and potentially incorporating sensors for monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the retaining ring dimensions are reduced to lower shear area, then the force required to break the ring is reduced, but the coupling between the bonnet and cage becomes slack causing misalignment and undesirable movement
Solution Approach 1:
The patent introduces a radial dimension feature (outwardly directed surface) on the retaining ring that engages with a corresponding groove in the bonnet. This radial engagement provides lateral positioning and prevents misalignment, while the ring's height (axial dimension) is reduced to lower the shear area and breaking force. Thus, the solution addresses both requirements by utilizing a different dimensional approach for stabilization.
Solution Approach 2:
The retaining ring has non-uniform geometry with a specific portion featuring an outwardly directed surface that engages with the bonnet groove. This localized feature provides the necessary coupling stability without requiring the entire ring to have increased dimensions. The local engagement zone maintains alignment while the rest of the ring maintains reduced dimensions for easier breaking.
2Ease of operation
If high force is applied to break the retaining ring for disassembly, then the ring can be broken, but other valve components such as the valve stem may be damaged
Solution Approach 1:
The patent modifies the geometric parameters of the retaining ring, specifically reducing its height to decrease the shear area. This parameter change directly reduces the force required to break the ring during disassembly, enabling easier operation without applying excessive force that could damage other valve components like the valve stem.
Solution Approach 2:
The retaining ring is designed as a separate, sacrificial component that can be independently broken. By segmenting the retention function from the main valve components, the design allows the ring to be the sole element subjected to breaking forces, protecting other critical components from damage during disassembly.
3Stability of the object's composition
If the retaining ring has adequate dimensions to maintain coupling stability, then alignment between bonnet and cage is maintained, but the force required to break the ring increases
Solution Approach 1:
The patent utilizes the radial dimension (outwardly directed surface) to provide coupling stability and alignment, while the axial dimension (height) is reduced to lower the breaking force requirement. This dimensional differentiation allows the ring to maintain stability through radial engagement while requiring less force to break due to reduced axial shear area.
Data Source
AI summary
A flow control device includes a valve body having an inlet, an outlet, and a flow path connecting the inlet and the outlet. A cage is disposed in the flow path, and a bonnet is coupled to the cage and includes a portion overlapping with a portion of the cage. A retaining ring is disposed between the cage and the bonnet. The retaining ring includes an interior side, an exterior side, and a cavity formed between the interior and exterior sides.