Segmented Valve Sealing Geometry for High-Pressure Wear Control
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Solution Overview
Problem
Traditional valves used in high-pressure fluid ends for oil and gas operations experience wear and erosion, leading to leakage and premature failure, which reduces pressure and flow capabilities and necessitates frequent replacements, resulting in lost production time and money.
Innovation Solution
The design of a valve with a tapered sealing surface and a recessed surface featuring a combination of straight-line and radius segments, along with a seal that engages these segments, helps to reduce wear and prevent separation, extending the valve's lifespan by distributing stress and maintaining a tight seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional valve designs are used in high-pressure fluid ends, then the valve can perform basic sealing function, but the valve experiences wear and erosion leading to leakage and premature failure
Solution Approach 1:
The recessed surface is segmented into multiple straight-line segments (L1, L2, L3, L4) and radius segments (R1, R2, R3, R4), creating a composite geometry that distributes wear and stress across different zones. This segmentation allows each segment to handle specific stress patterns, preventing concentrated wear at single points and extending valve service life while maintaining sealing reliability.
Solution Approach 2:
The recessed surface incorporates multiple radius segments (R1, R2, R3, R4) that provide curved transition zones between the straight-line segments. These curved surfaces distribute contact stresses more evenly across the seal interface, reducing erosion and wear compared to purely flat or angular surfaces, thereby extending valve life while maintaining reliable sealing under high-pressure conditions.
2Reliability
If the valve seal engages the valve seat under high pressure, then sealing is achieved, but wear and erosion increase leading to leakage
Solution Approach 1:
The seal engagement surface is divided into multiple straight-line segments and radius segments, distributing the high-contact pressure across numerous small contact zones rather than a single large area. This segmentation reduces the wear rate at each individual contact point while maintaining overall seal integrity, preventing the concentrated erosion that leads to leakage in traditional designs.
Solution Approach 2:
Different segments of the recessed surface are designed with specific geometries optimized for their local function: straight-line segments provide stable contact zones while radius segments provide smooth transition areas. This local optimization ensures that each region of the seal engages the valve seat in a manner that minimizes wear and erosion while maintaining the necessary sealing pressure distribution.
3Ease of manufacture
If a simple recessed surface is used, then manufacturing is easier, but the seal separates prematurely under high-pressure conditions
Solution Approach 1:
The recessed surface is designed as a sequence of discrete straight-line segments and radius segments that can be manufactured using standard machining operations. Each segment is defined by simple geometric parameters that are easy to program and execute on CNC equipment, maintaining ease of manufacture while the cumulative effect of all segments provides the complex stress-distributing geometry needed to prevent seal separation under high pressure.
Data Source
AI summary
A valve configured to seal against a valve seat. The valve and valve seat are configured to be installed within a fluid end. A recess is formed within the valve for receiving a seal. A shape of the recess and a shape of the valve are designed to reduce wear to the seal during operation.