Membrane Valve Undercut Bead High-Pressure Sealing
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Solution Overview
Problem
Membrane valves used in fluid separation applications are limited by high production costs and leakage issues at pressures above 10 bar, as existing manufacturing processes are time-consuming and prone to leakage at higher pressures.
Innovation Solution
A membrane valve design featuring a peripherally surrounding bead with an undercut on its radial inner side, supported by valve housing parts, enhances sealing with a radially inner sealing lip that is pressed against the housing by fluid pressure, allowing reliable operation up to 30 bar without leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional membrane valves are used with simple membrane clamping between housing parts, then the manufacturing process is simple, but the valves are prone to leakage at pressures above 10 bar
Solution Approach 1:
The bead is provided with an undercut at its radial inner side, creating a localized geometric feature that generates axial sealing force. This local structural modification transforms the sealing mechanism from simple contact to pressure-activated self-enhancing sealing, enabling reliable operation at pressures up to 30 bar without complicating the overall manufacturing process
Solution Approach 2:
The sealing mechanism transitions from static contact to dynamic pressure-responsive sealing. The undercut geometry causes the bead to generate axial sealing force that increases with fluid pressure, creating a self-enhancing sealing effect that adapts to varying pressure conditions
2Ease of manufacture
If conventional membrane clamping with contours in housing parts is used, then the device structure is simple, but production time and costs increase
Solution Approach 1:
Instead of modifying the housing parts with complex contours to clamp the membrane, the invention inverts the approach by providing the undercut geometry on the membrane bead itself. This shifts the sealing complexity from the housing to the membrane component, simplifying housing manufacturing and overall production
3Reliability
If membrane valves are designed for pressure range up to 10 bar, then the sealing structure remains simple, but the valves become unreliable at higher pressures
Solution Approach 1:
The undercut is provided only at the radial inner side of the bead, creating a localized feature that generates axial sealing force where needed. This targeted geometric modification enhances sealing reliability at high pressures without requiring complex sealing structures throughout the entire device
Solution Approach 2:
The undercut geometry enables the bead to generate its own axial sealing force in response to fluid pressure, creating a self-enhancing sealing mechanism. The sealing structure serves itself by using the operating pressure to enhance its own sealing capability, eliminating the need for additional complex sealing components
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 significantly improves sealing efficiency and reliability at higher pressures, reducing production costs and preventing leakage, enabling reliable operation of membrane valves beyond the conventional 10 bar limit.
Implementation Method 1
an axial sealing force is created by the undercut due to the fluid pressure so that a self-enhancement of the sealing effect is achieved
Implementation Method 2
in case of applying pressure to the membrane at least one pressure force component acts on the sealing lip and presses it in axial direction against the adjacent valve housing part, thus counteracting leakiness
Data Source
AI summary
A membrane valve comprising a first and a second valve housing part and a membrane clamped between the valve housing parts comprises a peripherally surrounding bead on the membrane and a thin, axially movable membrane portion adjacent thereto. The bead is supported by the two valve housing parts and is provided with an undercut at a radial inner side. Further, a membrane for installation in a membrane valve is provided.