Anti-rotation Assembly for Fluid Valves
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Solution Overview
Problem
Existing fluid valves with bellows-type seals are subjected to torsion loads that significantly reduce the operating life of the seals due to fluid flow, leading to premature failure.
Innovation Solution
The implementation of an anti-rotation assembly that includes an anti-rotation retainer and anti-rotator, which prevent twisting or rotation of the valve stem and flow control member relative to the valve body, thereby reducing torsional loads on the bellows-type seal and allowing for the use of a balanced flow control member that requires less thrust to operate, potentially using a smaller actuator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bellows-type seal is used to prevent fluid leakage along the valve stem, then sealing effectiveness is improved, but the seal is subjected to torsion loads from fluid flow that significantly reduce its operating life
Solution Approach 1:
The patent introduces an anti-rotation assembly as an intermediary component between the fluid flow and the bellows seal. This assembly includes a flow control member with an anti-rotation feature and a retainer that prevents the flow control member from rotating due to fluid flow forces, thereby protecting the seal from torsion loads while maintaining sealing effectiveness
Solution Approach 2:
The anti-rotation assembly applies a preliminary counteracting force to prevent the harmful rotational effect before it can reach the seal. The retainer mechanically constrains the flow control member against rotation, preemptively neutralizing the torsion loads that would otherwise be transmitted to the bellows seal during fluid flow
2Productivity
If a traditional flow control member is used, then fluid flow control is achieved, but the member is subject to rotation from fluid flow that increases torsional loads on the seal
Solution Approach 1:
The anti-rotation retainer acts as an intermediary that decouples the harmful rotational effect from the useful flow control function. It allows the flow control member to perform its primary function while blocking the transmission of rotational forces to the seal
3Duration of action of stationary object
If an anti-rotation assembly is added to prevent seal deterioration, then seal operating life is extended, but device complexity increases
Solution Approach 1:
The anti-rotation retainer is merged with the existing flow control member assembly, integrating the anti-rotation function into the existing structure. The retainer can be positioned within the valve body and coupled to the flow control member, combining multiple functions in a unified assembly rather than adding completely separate components
Solution Approach 2:
The flow control member is designed with multi-functionality, serving both as the primary fluid flow control element and as the anchor for the anti-rotation retainer. This universal component performs multiple roles: flow regulation, structural support, and anti-rotation anchoring, reducing the need for additional dedicated parts
Data Source
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AI summary
Anti-rotational assemblies for use with fluid valves are disclosed herein. An example anti-rotation assembly includes an anti-rotation retainer to couple to a flow control member of a valve and an anti-rotator to engage the anti-rotation retainer. The anti-rotator prevents rotation of the anti-rotation retainer relative to a longitudinal axis of the anti-rotation retainer when the anti-rotation retainer is disposed in the valve.