Check Valve with Inclined Seat and Elastic Blocking Tab
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Solution Overview
Problem
Conventional check valves and piston pumps face inefficiencies due to complex designs, fluid flow disruptions, and low actuation frequencies, particularly in applications like urea injection systems for diesel vehicles, where fluid can escape or crystallize, leading to undesirable leaks and reduced performance.
Innovation Solution
A check valve design featuring an inclined valve seat with a blocking element made of elastically deformable material and a conical stop element that fills the space between blocking tabs, reducing dead volume and power loss, allowing for higher actuation frequencies and improved flow dynamics, integrated into a piston pump system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional check valve design with a ball or flap is used, then the valve can block fluid flow in one direction, but the device complexity increases and fluid flow is disrupted in the open position
Solution Approach 1:
The blocking element is designed as a single integrated component with two blocking tabs that can seal against two different valve seats simultaneously. This merging of multiple sealing functions into one component reduces the number of parts while maintaining reliable bidirectional flow control capability
Solution Approach 2:
The blocking element serves multiple functions: it can seal against the first valve seat for flow from first to second pressure chamber, seal against the second valve seat for flow from second to first pressure chamber, and the single component design simplifies the overall valve structure
2Reliability
If a flap check valve is used, then the valve can block fluid flow, but the fluid flow is disrupted in the open position leading to low efficiency
Solution Approach 1:
The blocking tabs are made of elastically deformable material that can dynamically adapt to the valve seats. When fluid pressure acts on the tabs, they flex to open the valve smoothly without creating turbulence or flow disruption, allowing efficient fluid passage while maintaining sealing capability
Solution Approach 2:
The blocking element utilizes elastic deformation parameter changes to transition between sealed and open states. The material's elasticity allows gradual opening rather than abrupt movement, maintaining smooth fluid flow and high efficiency
3Device complexity
If a conventional check valve without dead space reduction is used, then the valve structure is simple, but power loss increases and delivery capacity is reduced
Solution Approach 1:
The blocking element is segmented into two separate blocking tabs that can independently seal against respective valve seats. This segmentation allows the element to effectively seal both directions of flow while minimizing dead space between the blocking surfaces and the valve body, reducing fluid trapping and associated power losses
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 enhances the check valve's efficiency and actuation frequency, reducing power loss and fluid backflow, enabling higher pumping frequencies and longer service life while minimizing fluid leakage and crystallization issues in urea injection systems.
Implementation Method 1
a blocking element which has at least one flat blocking tab made of an elastically deformable material, which in a blocking position rests against the valve seat
Implementation Method 2
the stop element is designed as a volume element that expands conically in the flow direction and fills the space defined between the blocking tabs by at least 50%, in particular at least 80%
Data Source
Figure 1~2
Figure 3~4
Figure 5~7
AI summary
The invention relates to a check valve (10) having a valve housing (12) on which a valve seat (18) is formed, designed as an angled surface relative to a flow direction (S), and having a blocking element (22) comprising at least one flat blocking tab (24) made of an elastically deformable material, contacting the valve seat (18) in a blocked position and raised from the valve seat (18) in an open position, in order to allow the passage of fluid (30), wherein a stop element (34) is disposed on the side of the blocking tab (24) facing away from the valve seat, against which the blocking tab (24) can strike, in order to limit the distance that the blocking tab (24) can rise from the valve seat.