Valve Disk Self-Aligning Ball Joint Seal
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Solution Overview
Problem
Existing valve sealing arrangements, particularly those using hard materials like PTFE, face challenges in achieving a bubble-tight seal due to alignment issues and are prone to seal failure under turbulence, especially when used with industrial fluids like hot water and steam.
Innovation Solution
A valve design featuring an articulated joint with a ball bearing and a recessed PTFE O-ring seal, allowing self-alignment and secure contact with the valve seat, which accommodates misalignment and prevents dislodgment, utilizing a loose-fitting spindle and a profiled recess to ensure robust sealing across a wide range of industrial fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hard seal materials such as PTFE are used, then the seal can withstand industrial fluids like hot water and steam, but the quality of the seal becomes more dependent on accurate alignment between the disk and the seat
Solution Approach 1:
The valve disk is made rotatable relative to the spindle through a ball joint mechanism, allowing the sealing member to dynamically adjust its position and self-align with the valve seat during operation, thereby compensating for alignment variations without requiring extremely precise manufacturing tolerances
Solution Approach 2:
The sealing member automatically self-aligns with the valve seat through the rotatable joint mechanism, eliminating the need for external adjustment mechanisms or highly precise pre-alignment during manufacturing and installation
2Ease of operation
If a ball bearing articulation is used between the spindle and the sealing member, then the sealing member can self-align on the valve seat, but the seal quality becomes more dependent on precise alignment
Solution Approach 1:
The ball bearing articulation creates a dynamic rotational joint that allows continuous adjustment of the sealing member's orientation, enabling it to adapt to misalignment conditions and maintain effective sealing contact
Solution Approach 2:
The rotatable joint changes the operational parameters of the sealing member by allowing angular adjustment, transforming a static alignment-dependent seal into a dynamically adaptable sealing system that can compensate for manufacturing tolerances
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
The solution provides a robust, leak-proof seal with PTFE or similar materials, maintaining sealing integrity under varying conditions and turbulence, ensuring accurate alignment and preventing seal dislodgment, thus enhancing the performance of safety valves with industrial fluids.
Implementation Method 1
the valve disk is connected to a spindle via an articulated joint formed by an end surface of the spindle abutting a ball bearing located in a base of the cavity in the top surface of the body
Data Source
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AI summary
A valve comprises a fluid outlet, a fluid inlet, a valve seat (103) and a valve disk (102) arranged to move relative to the valve seat to control the flow of fluid from the inlet to the outlet. The valve disk (102) comprises a body (201) and a sealing member (202), wherein the valve disk is connected to a spindle (101) via an articulating joint comprising two abutting surfaces, one of which is arranged to allow rocking motion between the surfaces providing the articulation thereby allowing the sealing member (202) to self-align on the valve seat (103). The articulating joint may be formed by an end surface of the spindle (101) abutting a ball bearing (207) located in a cavity (200) in the top of the valve disk (102).