Dual Piston Ball Valve Bidirectional Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional ball valves face challenges in maintaining effective sealing and actuation in high-pressure downhole environments, where existing seals fail to reliably manage fluid pressure from both sides, leading to inefficiencies in fluid control and potential leaks.
Innovation Solution
A ball valve assembly featuring a truncated sphere with two concentrically oriented, tubular sealing pistons that are exclusively actuable into fluid pressured sealing engagement with the spherical cap sealing face, depending on the direction of fluid pressure, and an actuation mechanism that includes cylindrical retaining members and a trunnion for anchoring and rotation, ensuring sealing engagement regardless of pressure direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a passive seal presses against the ball at all times, then sealing is maintained under normal conditions, but sealing reliability fails in high-pressure downhole environments with bidirectional pressure
Solution Approach 1:
The seal transitions from a static passive seal to a dynamic active seal that responds to pressure changes. The seal is configured to be actively pushed against the ball by fluid pressure in either direction, making the sealing force dynamic and adaptive rather than fixed, thereby maintaining sealing reliability under bidirectional high-pressure conditions
Solution Approach 2:
The seal system uses the fluid pressure itself to activate the sealing mechanism. The seal is positioned and biased such that fluid pressure from either direction automatically pushes the seal against the ball, making the seal self-activating and eliminating the need for external actuation mechanisms, thus achieving adaptability to pressure direction
2Device complexity
If conventional seals are used in high-pressure environments, then device simplicity is maintained, but sealing effectiveness deteriorates under bidirectional pressure
Solution Approach 1:
The seal system is segmented into distinct functional components: the seal element itself, the biasing mechanism, and the pressure-responsive activation structure. This segmentation allows each component to be optimized for its specific function while working together to achieve reliable bidirectional sealing without excessive overall complexity
Solution Approach 2:
The seal design incorporates parameters that change in response to pressure, such as the seal position, contact force, and engagement geometry. These parameters are configured to automatically adjust based on the direction and magnitude of fluid pressure, enabling effective sealing under varying pressure conditions while maintaining a relatively simple structure
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 reliable sealing and efficient fluid control by ensuring sealing engagement with the truncated sphere, regardless of fluid pressure direction, enhancing the operational reliability and integrity of the ball valve assembly in high-pressure environments.
Implementation Method 1
concentrically oriented, tubular sealing pistons that are exclusively actuable into fluid pressured sealing engagement with the spherical cap sealing face
Data Source
AI summary
Ball valve assembly (100) including a truncated sphere (140) anchored in a two cylindrical retaining members (48, 50) of the ball valve assembly (100), the truncated sphere (140) having a spherical cap sealing face (142). The ball valve assembly (100) also includes a pair of concentrically oriented, tubular sealing pistons (120, 130), each piston (120, 130) exclusively actuable, one relative to the other, into fluid pressured sealing engagement with the spherical cap sealing face (142) in dependence upon whether an experienced fluid pressure at the ball valve assembly (100) is from a top side (102) or an opposite bottom side (104) of the ball valve assembly (100).