Expandable Sleeve Valve for Pressure-Differential Flow Control
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Solution Overview
Problem
Conventional valve designs employing springs and diaphragms are prone to failure and difficult to repair, necessitating an improved and alternative valve design for various applications.
Innovation Solution
A sleeve valve design featuring an outer housing with inlet and outlet channels, perforated circumferential walls, a resiliently expandable sleeve, and an expansion gap that opens perforations when inlet pressure exceeds a charge pressure, allowing fluid flow, and includes a pre-loaded expansion vessel to regulate valve opening based on pressure differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional valve designs with springs and diaphragms are used, then valve function is achieved, but reliability deteriorates due to proneness to failure and difficulty of repair
Solution Approach 1:
The valve is divided into modular components: an outer housing, removable circumferential walls with integrated perforations, and a separate resilient sleeve. This segmentation allows individual components to be replaced independently, improving repairability while maintaining overall valve reliability.
Solution Approach 2:
A resilient expandable sleeve made of flexible material replaces traditional springs and diaphragms. The sleeve can be radially expanded to open perforations and collapsed to close them, providing reliable valve operation with simpler repair requirements since the flexible sleeve is less prone to mechanical failure.
2Reliability
If a resilient expandable sleeve is used to control flow through perforations, then valve reliability improves, but device complexity increases due to expansion gap and charging port requirements
Solution Approach 1:
The charging port is integrated into the outer housing rather than being a separate component. The expansion gap is built into the valve structure between the sleeve and housing interior wall. These integrations reduce the number of separate parts while maintaining the core functionality of the resilient sleeve mechanism.
Solution Approach 2:
The resilient sleeve automatically responds to pressure differential between inlet channel and expansion gap, expanding when inlet pressure exceeds charge pressure and collapsing when it doesn't. This self-actuating mechanism eliminates the need for complex external control systems, actuators, or control valves.
3Reliability
If the sleeve is held in a closed position by charge pressure, then fluid leakage is prevented, but pressure regulation complexity increases due to pre-loaded expansion vessel
Solution Approach 1:
The expansion vessel is pre-loaded with pressurized gas before installation. This pre-charge creates the initial charge pressure in the expansion gap that holds the sleeve in the closed position, ensuring sealing reliability from the moment of installation without requiring complex active pressure regulation systems.
Solution Approach 2:
A pre-loaded expansion vessel using pressurized gas replaces complex mechanical spring systems or active hydraulic pressure regulation. The pneumatic pressure from the pre-charged vessel provides reliable sealing force while simplifying the overall pressure regulation mechanism.
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 sleeve valve design provides a reliable and repairable solution for fluid control, ensuring efficient fluid flow and pressure regulation, reducing the risk of valve failure and improving maintenance by using a resilient sleeve that expands to open perforations and collapses to close them, thus preventing fluid leakage.
Implementation Method 1
the sleeve is expandable off of the first and second circumferential walls to open up the first and second sets of one more perforations when an inlet pressure in the inlet channel exceeds a charge pressure in the expansion gap
Implementation Method 2
a resiliently expandable sleeve disposed around the first and second circumferential walls within the interior of the outer housing
Implementation Method 3
a pre-loaded expansion vessel connected to the charge port of the sleeve valve to pressurize the expansion gap inside the valve housing of the sleeve valve
Implementation Method 4
thereby prevent opening of the second valve until the inlet channel of the second valve achieves greater pressure than said pre-loaded expansion vessel
Data Source
AI summary
A valve features an outer housing, in which there are provided inlet and outlet channels respectively reaching into the housing from inlet and outlet openings thereof. The two channels are axially closed at adjacent inner ends thereof, but feature perforated circumferential walls. A resiliently expandable sleeve is disposed around the circumferential walls in a position normally overlying the perforations, while leaving a gap between the sleeve and inner surfaces of the housing. A charging port communicates with the gap to enable pressurization thereof. Pressurization of the gap normally holds the sleeve tightly over the perforations to prevent flow from one channel to the other. When pressure in the inlet channel exceeds the pressure in the charging chamber, the sleeve radially expands from the circumferential walls of the channels to uncover the perforations and allow fluid to flow between the channels.