Composite Pipe Gasket Structure to Prevent High-Pressure Blow-Out
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Solution Overview
Problem
Ductile iron pipe systems face challenges with gasket blow-outs under high pressure due to greater manufacturing tolerances, requiring a cost-effective and easy-to-manufacture sealing solution that maintains a seal without interfering with gasket insertion.
Innovation Solution
A slim seal design using a polypropylene-EPDM bonded combination with a hard plastic and softer rubber configuration, featuring a circumferential reinforcement band with rigid tabs, reduces material volume by 40% and ensures the gasket remains seated within the annular groove under pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional Tyton gasket with large rubber volume is used, then sealing reliability is improved, but manufacturing cost and material usage increase
Solution Approach 1:
The patent applies composite materials by combining a harder synthetic plastic material (polypropylene) with a softer elastomeric material (EPDM rubber). The harder material forms a reinforcement band that provides structural integrity and prevents blow-out, while the softer material provides sealing functionality. This composite structure reduces the overall rubber volume needed while maintaining sealing reliability.
Solution Approach 2:
The gasket is segmented into distinct functional zones: a harder reinforcement band portion and a softer sealing portion. This segmentation allows each part to perform its specific function optimally - the reinforcement band prevents blow-out under pressure while the softer sealing surface maintains the actual seal, reducing the need for excessive rubber material throughout the entire gasket.
2Reliability
If a gasket reinforcement mechanism is added to prevent blow-outs, then sealing reliability under pressure is improved, but device complexity increases
Solution Approach 1:
Rather than adding a separate mechanical reinforcement structure, the patent integrates reinforcement functionality directly into the gasket material itself through the use of a harder synthetic plastic material band. This composite approach provides blow-out prevention without requiring additional components, fasteners, or complex assembly mechanisms.
Solution Approach 2:
The harder synthetic plastic material is strategically placed in the reinforcement band portion of the gasket where structural integrity is needed to resist blow-out forces. The softer elastomeric material is used in the sealing surface portion where flexibility and conformability are needed. This local differentiation of material properties provides targeted reinforcement without complicating the overall gasket design.
3Ease of manufacture
If rubber material volume is reduced to lower cost, then manufacturing cost is improved, but gasket strength and seal integrity worsen
Solution Approach 1:
The patent replaces a portion of the expensive rubber material with a cheaper synthetic plastic material (polypropylene) in the reinforcement band. This substitution reduces overall material cost while the composite structure maintains gasket strength - the harder plastic provides structural reinforcement that compensates for the reduced rubber volume, preventing both blow-outs and maintaining seal integrity.
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 reliable, cost-effective seal with reduced material costs and prevents gasket blow-outs, maintaining integrity under high pressure conditions while being easy to manufacture and install.
Implementation Method 1
A slim seal design using a polypropylene-EPDM bonded combination with a hard plastic and softer rubber configuration
Implementation Method 2
the annular gasket body is made of a resilient elastomeric material... the gasket body also has a circumferential groove for receiving a mating circumferential reinforcement band
Implementation Method 3
The circumferential reinforcing band has a plurality of rigid tabs which extend outwardly from the circumferential body of the band... ensures the gasket remains seated within the annular groove under pressure
Data Source
AI summary
A sealing gasket is shown which is used to seal the belled end opening of a female ductile iron pipe to a mating male pipe having an interior surface and an exterior surface. The sealing gasket has an annular gasket body made of a resilient elastomeric material which is bonded to a hard plastic reinforcing band. The annular gasket body is installed within a raceway provided in the mouth region of the female ductile iron pipe so that an outer circumferential region forms a seal with the female pipe mouth region and an inner circumferential region forms a sealing surface for the exterior surface of the mating male pipe. The reinforcing band has a circumferential body which is made of a synthetic polymer which has a greater hardness than the elastomeric material of the remainder of the gasket body.