Ball Valve Seat Structure for High-Pressure Seal Lip Durability
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Solution Overview
Problem
High-pressure and high-temperature ball valves with one-way seal lips made of elastic materials face permanent deformation issues, leading to operational failures, and existing solutions increase production costs to maintain sealing integrity.
Innovation Solution
A ball valve design featuring a combined SPE-DPE configuration with a reduced number of movable seats and an intermediate element, eliminating the need for springs and simplifying production by aligning seat and valve body shapes, ensuring effective sealing without mechanical deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If one-way seal lips made of elastic materials are used in high-pressure and high-temperature applications, then sealing integrity is improved, but permanent deformation occurs over time leading to operational failure
Solution Approach 1:
The patent changes the material parameters by transitioning from elastic materials (PEEK/PTFE) to rigid materials (stainless steel, Inconel, Hastelloy) for the seal lips. This parameter change allows the seal lips to maintain their mechanical properties and sealing integrity under high-pressure and high-temperature conditions without undergoing permanent deformation, thereby extending service life while preserving reliability
Solution Approach 2:
The patent employs composite material structures where rigid seal lips (stainless steel, Inconel, or Hastelloy) are combined with soft seal elements (PTFE or PEEK liners). This composite approach allows the rigid component to maintain structural integrity and resist deformation under extreme conditions, while the soft liner provides the necessary sealing contact, thus resolving the contradiction between sealing integrity and durability
2Duration of action of stationary object
If a movable intermediate element is placed between two seals to prevent permanent deformation, then working life of seal lips is extended, but valve body complexity and production costs increase
Solution Approach 1:
The patent extracts and eliminates the movable intermediate element from the valve structure. Instead of using a complex intermediate component to prevent deformation, the invention directly addresses the root cause by using rigid seal lip materials that inherently resist permanent deformation under high-pressure and high-temperature conditions, thereby simplifying the valve body design and reducing production costs
Solution Approach 2:
Rather than adding a complex intermediate element to protect the seals from deformation, the patent inverts the approach by making the seal lips themselves (through material selection) resistant to deformation. This inversion eliminates the need for additional protective structures, simplifying the overall device complexity while maintaining extended service life
3Strength
If rigid materials like stainless steel, Inconel, or Hastelloy are used for seal lips, then resistance to permanent deformation is improved, but adaptability to different sealing requirements may be reduced
Solution Approach 1:
The patent resolves this contradiction by creating a composite seal lip structure where a rigid substrate (stainless steel, Inconel, or Hastelloy) provides deformation resistance, while a soft liner material (PTFE or PEEK) bonded to the substrate provides sealing compatibility and adaptability to different sealing requirements. This composite design allows the seal lip to simultaneously achieve high strength and versatile sealing performance
Solution Approach 2:
The patent applies local quality by having different material properties in different regions of the seal lip. The rigid substrate material provides localized strength and deformation resistance where structural integrity is needed, while the soft liner material provides localized compliance and sealing contact where adaptability to various sealing surfaces is required, thus resolving the contradiction between strength and versatility
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 maintains mechanical and sealing integrity while reducing production costs and complexity, preventing permanent deformation of seal lips under high-pressure and high-temperature conditions.
Implementation Method 1
mono-directional seal lips made up of elastic materials energized by springs in the seats
Implementation Method 2
seal lips made up of elastic materials energized by springs
Data Source
AI summary
Valve comprising a valve body having an upstream conduit for the inflow of a fluid and a downstream conduit for the outflow of a fluid, said conduits being substantially aligned along a longitudinal axis (X-X), a rotative ball controlling the fluid passage and having a cavity with axis perpendicular to its rotating axis (Y-Y), a first upstream seat operating in conjunction with said upstream conduit and said rotative ball, a first downstream seat operating in conjunction with said downstream conduit and said rotative ball, a second downstream seat axially arranged between said first downstream seat and said downstream conduit, and an intermediate element axially arranged between said first downstream seat and said second downstream seat and axially moveable between said first downstream seat and said second downstream seat.