PVC-O Pipe Socket Sealing Ring and Gripping Ring Raceway Fit
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Solution Overview
Problem
Current sealing and restraint systems for molecularly oriented PVC-O pipe joints face challenges due to the unique geometry of the Anger Raceway, which complicates providing a securely sealed joint, and existing solutions are often costly and less effective in maintaining joint integrity under various pressures and external forces.
Innovation Solution
A sealing and restraint system comprising an elastomeric sealing ring with a protruding ear and a hardened gripping ring with interlocking profiles, where the sealing ring is installed by collapsing it inwardly and the gripping ring is positioned within the pre-existing raceway, ensuring retention and preventing extrusion, and the gripping ring's external stop limits its displacement during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional sealing and restraint system is used in PVC-O pipe joints, then the joint can be formed, but the unique geometry of the Anger Raceway complicates providing a securely sealed joint and increases cost
Solution Approach 1:
The sealing element is divided into distinct functional segments: a sealing portion with radially outwardly extending sealing lips for creating the seal, and a restraint portion with gripping surfaces for preventing disengagement. This segmentation allows each portion to be optimized for its specific function within the constraints of the Anger Raceway geometry.
Solution Approach 2:
Different portions of the sealing element have different properties tailored to their functions: the sealing portion has flexible sealing lips for creating a seal against the spigot, while the restraint portion has harder gripping surfaces for engaging the spigot and preventing disengagement. This local differentiation of properties solves the complexity of providing both sealing and restraint functions in the unique Anger Raceway geometry.
2Reliability
If existing sealing and restraint systems are used, then joints can be formed, but they are costly and less effective in maintaining joint integrity under various pressures and external forces
Solution Approach 1:
The sealing element combines both sealing and restraint functions into a single integrated component that is installed within the Anger Raceway. The sealing portion provides the seal while the restraint portion with its gripping surfaces provides restraint against disengagement, eliminating the need for separate sealing and restraint components and reducing overall system cost.
Solution Approach 2:
The restraint portion is designed to dynamically respond to forces acting on the joint: the gripping surfaces engage the spigot to prevent disengagement under hydraulic pressure, while allowing proper insertion during assembly. This dynamic behavior maintains joint integrity under varying pressure conditions without requiring over-engineered static restraint mechanisms.
3Ease of operation
If a sealing element is installed by collapsing it inwardly, then installation is simplified, but the element must be designed to return to its normal state while maintaining seal integrity
Solution Approach 1:
The sealing element utilizes elastic deformation as a parameter change mechanism: during installation, the element is collapsed inwardly (changing its dimensional parameters) to fit through the raceway opening, then it elastically returns to its normal expanded state, maintaining the seal against the spigot. This parameter change allows simple installation while preserving seal integrity.
Solution Approach 2:
The sealing element is pre-designed with inherent elastic recovery characteristics that cushion and control its expansion from the collapsed installation state to the operational sealed state. This pre-engineered elastic behavior ensures the element returns to its normal state without damaging the spigot or compromising the seal, maintaining reliability during the installation process.
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 system provides a secure, cost-effective, and reliable method for joining molecularly oriented PVC-O pipes by simplifying the installation process and enhancing joint integrity, reducing the complexity and expense associated with traditional belling operations and external restraints.
Implementation Method 1
The sealing element can conveniently be installed by temporarily collapsing the sealing element inwardly upon itself and positioning the sealing element in the raceway, and thereafter allowing the sealing element to return to a normal uncollapsed state
Data Source
AI summary
A seating and restraint system is shown for joining the spigot and socket ends of two sections of plastic pipe to form a pipe joint. The socket pipe ends are preformed at the factory with an internal raceway which receives both a sealing ring and a companion gripping ring. The sealing ring is an elastomeric member having a periphery with a protruding ear formed at one circumferential location. The companion gripping ring is a hardened member having one opening gap in the circumference thereof. The protruding ear on the sealing ring fits within the opening gap in the gripping ring, engagement of the protruding ear within the opening gap serving to prevent extrusion of the sealing ring within the gap in the gripping ring and also limiting closure of the gripping ring after engagement of the spigot end with the socket pipe end as the pipe joint is assembled.