Filter Head Valve Unit With Prestressed Tab Sealing
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Solution Overview
Problem
Existing valve units in liquid filtration systems face challenges with sealing and pressure stability, particularly in blocking directions, leading to potential leaks and increased pressure loss, which is critical in applications like fuel supply systems.
Innovation Solution
A valve unit with a plate-shaped valve body featuring a closure section and a connecting section, where the closure section has a closure tab and a contact tab that creates a prestress for improved sealing, and a filter head with a valve seat and fastening pin for secure attachment, allowing for reliable sealing and reduced pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional closure tab design is used, then the valve unit structure is simple, but the sealing performance deteriorates under counterpressure
Solution Approach 1:
The valve body is divided into two separate parts: a closure tab and a contact tab, each with distinct functions. The closure tab provides sealing contact with the valve seat, while the contact tab transmits prestress forces. This segmentation allows independent optimization of sealing performance and structural stability without increasing overall complexity.
Solution Approach 2:
The connecting section is pre-stressed during assembly to create a prestress force that acts on the closure tab. This preliminary action ensures that the closure tab maintains optimal contact pressure with the valve seat even under counterpressure conditions, improving sealing reliability before actual operation begins.
2Reliability
If the closure tab is made more rigid to prevent deformation, then sealing improves, but pressure stability in blocking direction deteriorates
Solution Approach 1:
By separating the closure tab from the connecting section, the design allows the closure tab to remain relatively rigid for consistent sealing, while the connecting section can be designed with appropriate flexibility to maintain pressure stability. Each segment can be independently optimized for its specific function.
Solution Approach 2:
The contact tab acts as an intermediary element that transmits forces from the connecting section to the closure tab. This mediator allows the closure tab to maintain stable sealing contact while the connecting section manages pressure fluctuations, decoupling the requirements for sealing consistency and pressure stability.
3Ease of operation
If the valve unit allows free positioning, then ease of installation improves, but sealing reliability deteriorates due to misalignment
Solution Approach 1:
The contact tab is designed to engage with the filter head structure during assembly, preliminarily positioning the valve unit before final tightening. This preliminary positioning action ensures proper alignment of the closure tab with the valve seat, maintaining sealing reliability while preserving installation ease through self-aligning features.
Solution Approach 2:
The valve unit incorporates self-aligning features where the contact tab automatically positions itself relative to the filter head during installation. This self-service mechanism ensures correct alignment without requiring precise manual positioning, maintaining both installation ease and sealing reliability.
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 enhanced sealing and pressure stability, preventing leaks and minimizing pressure loss, even under counterpressures, ensuring reliable operation in fuel supply systems and other fluid applications.
Implementation Method 1
the closure section having a closure tab which extends protrudes from a first fastening section on the frame into the opening
Implementation Method 2
the valve unit only allows liquid to flow through the filter head when the filter cartridge is correctly positioned
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a valve unit (10) with a plate-shaped valve body (20) comprising a closure section (30) and a connecting section (40), wherein the valve body (20) includes a frame (24) that encloses an opening (26) in the valve body (20), the closure section (30) having a closure tab (32) that projects into the opening (26) from a first mounting section (34) on the frame (24). The connecting section (40) has a contact tab (42) that projects into the opening (26) from a second mounting section (44) on the frame (24) and further has at least one mounting point (50). The first mounting section (34) and the second mounting section (44) are arranged opposite each other on the frame (24) along a longitudinal axis (22) of the valve body (20).Furthermore, the invention relates to a filter head (120) and a filter system (100) comprising a filter head and a valve unit (10).