Swing Check Valve Sealing With Dual Metal-Elastomer Seats
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing swing check valves face challenges in achieving durable and reliable seals between the disc and seat, particularly under varying pressure conditions, which can lead to leakage and reduced operational efficiency.
Innovation Solution
A swing check valve design featuring a metallic body seat with a raised engagement surface and a flexible disc seat, where the metallic body seat includes a protrusion that engages the flexible disc seat, allowing for a durable seal under high and low pressures through metal-on-metal contact and a flexible elastomeric engagement, with a seat cavity and retaining ring for alignment and retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional seal between disc and seat is used, then the valve structure is simple, but the seal reliability deteriorates under varying pressure conditions
Solution Approach 1:
The sealing arrangement is divided into two separate seats: a metallic body seat providing structural support and a flexible disc seat providing sealing contact. This segmentation allows each component to be optimized for its specific function, improving seal reliability without requiring a single complex sealing structure.
Solution Approach 2:
The sealing system combines two different materials with complementary properties: metal (rigid, durable) for the body seat and flexible elastomer (compliant, seal-friendly) for the disc seat. This composite approach enables reliable sealing under varying pressure conditions by combining the advantages of both materials.
2Duration of action of stationary object
If a flexible disc seat is used, then the seal durability is improved, but the manufacturing complexity increases
Solution Approach 1:
The sealing function is segmented between the metallic body seat (easier to manufacture with standard machining) and the flexible disc seat (can be manufactured as a separate elastomeric component). This allows each part to be manufactured using appropriate processes for its material properties, improving overall manufacturability while maintaining durability.
Solution Approach 2:
The design changes the material parameters of the sealing surfaces: the metallic body seat provides a rigid, dimensionally stable foundation, while the flexible disc seat provides compliance and conformability. This parameter change enables durable sealing without requiring complex manufacturing of a single component.
3Strength
If metal-on-metal contact is used for engagement, then the structural strength is improved, but the sealing performance deteriorates
Solution Approach 1:
The engagement surface combines metal-on-metal contact for structural strength and support with a flexible elastomeric disc seat for sealing performance. The metallic body seat provides the rigid framework and load-bearing capacity, while the flexible disc seat provides the compliant sealing contact, thus achieving both strength and sealing performance simultaneously.
Solution Approach 2:
Different local regions of the sealing arrangement have different qualities: the metallic body seat engagement surface provides rigid structural support where strength is needed, while the flexible disc seat contact surface provides compliant sealing where leak prevention is needed. This local differentiation resolves the contradiction between strength and sealing performance.
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 design provides a robust and long-lasting seal that maintains fluid integrity under diverse pressure conditions, minimizing leakage and ensuring reliable operation over time.
Implementation Method 1
a flexible elastomeric portion, wherein the metallic body seat comprises an engagement surface for engaging the flexible elastomeric portion
Implementation Method 2
allowing for a durable seal under high and low pressures through metal-on-metal contact and a flexible elastomeric engagement
Data Source
AI summary
A swing check valve is disclosed, the swing check valve comprising a housing; a disc; and a sealing arrangement between the housing and disc. The sealing arrangement comprises a flexible disc seat; and a metallic body seat. The metallic body seat comprises an engagement surface for engaging the flexible disc seat, the engagement surface includes a raised portion for engaging the flexible disc. In an embodiment the metallic body seat comprises an engagement surface for engaging the disc seat, the engagement surface comprising a first portion for engaging a flexible elastomeric portion of the disc seat and a second portion for engaging a metallic portion of the disc seat after compressing the flexible elastomeric portion.