Pressure-Differential Valve Seating for Metal-to-Metal Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing valve designs face issues with sealing reliability due to the use of elastomeric seals in high-pressure, hazardous environments, leading to maintenance challenges and potential failures from contamination, grease loss, and pressure-related sealing issues.
Innovation Solution
A valve design featuring a seat and seat bushing configuration that maintains sealing contact with the plug body in both open and closed positions, using metal components and a differential pressure mechanism to ensure a robust metal-to-metal seal, with additional seals and a keyed system for easy maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastomeric seals are used in high-pressure hydrocarbon environments, then sealing capability is improved, but reliability deteriorates due to degradation and failure from corrosion and contamination
Solution Approach 1:
The patent changes the material parameter of the seal from elastomeric to metal (stainless steel), transforming the sealing mechanism to withstand high-pressure hydrocarbon environments without degradation from corrosion or contamination
Solution Approach 2:
The patent employs a composite sealing system combining metal-to-metal primary sealing surfaces with elastomeric backup seals, where the metal components provide corrosion resistance and the elastomeric materials provide secondary sealing capability
2Device complexity
If single-sided sealing is used to simplify valve design, then device complexity is reduced, but reliability deteriorates due to contamination of sealing surfaces and grease loss
Solution Approach 1:
The patent divides the sealing mechanism into multiple independent sealing surfaces (upstream and downstream) with separate sealing interfaces, allowing each seal to function independently and preventing contamination from compromising the entire sealing system
Solution Approach 2:
The patent introduces a seat bushing as an intermediary component between the valve body and the plug, which maintains constant engagement with the plug through pressure differential forces and prevents direct exposure of sealing surfaces to contaminating fluids
3Ease of manufacture
If traditional seat design is used to reduce manufacturing cost, then ease of manufacture is improved, but reliability deteriorates due to insufficient sealing contact under high pressure
Solution Approach 1:
The patent makes the seat dynamic by allowing it to move axially in response to pressure differential forces, automatically adjusting the sealing contact pressure to maintain consistent sealing under varying high-pressure conditions without requiring complex pre-load mechanisms
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 enhances sealing reliability, reduces maintenance costs, and maintains effective sealing performance across varying pressures, preventing leaks and degradation, while allowing for easy replacement of parts.
Implementation Method 1
uses asymmetric pressure applied to a bushing and sealing mechanism to allow for improved sealing performance
Data Source
AI summary
A valve for use in oil and gas production or similar applications includes a plug or other flow barrier disposed in a cavity of a hollow valve body with a metal-to-metal sealing surface that is not reliant on any rubberized or elastomeric material to effect a seal.