Check Valve Spring Damping for Wastewater Lifting Systems
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Solution Overview
Problem
Existing wastewater lifting systems experience violent flap impacts and high pressure surges when closing the check valve, leading to noise and potential damage, which requires robust metal housings and results in annoying noise propagation.
Innovation Solution
Incorporating a spring element connected to the check valve that exerts a force in the direction of its closed position, reducing the opening angle and closing time, and using a symmetrical spring design to minimize pressure surges and noise, allowing for a plastic housing instead of metal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a check valve with a large ball passage is used to easily pump out solids, then the ball passage is large, but the flap impact is violent causing high pressure surge and noise
Solution Approach 1:
A rubber cushion element is positioned between the flap and the closure surface of the ball passage. When the flap closes, the rubber cushion absorbs the impact energy through deformation, cushioning the violent impact before it reaches the metal housing and riser pipe, thereby reducing pressure surge and noise while maintaining the large ball passage opening for solid waste removal
2Ease of operation
If a check valve with a large ball passage is used to easily pump out solids, then the ball passage is large, but the flap impact noise spreads through pipelines
Solution Approach 1:
The rubber cushion element is positioned between the flap and the closure surface of the ball passage. When the flap closes, the rubber cushion absorbs the impact energy through deformation, cushioning the violent impact before it reaches the metal housing and riser pipe, thereby reducing pressure surge and noise
3Strength
If the check valve housing is made of metal to withstand pressure surge, then the strength is high, but the weight and cost increase
Solution Approach 1:
A rubber cushion element is positioned between the flap and the closure surface of the ball passage. When the flap closes, the rubber cushion absorbs the impact energy through deformation, cushioning the violent impact before it reaches the metal housing and riser pipe, thereby reducing pressure surge and noise while allowing use of lighter materials
Solution Approach 2:
The invention uses a composite construction combining rubber (elastic material) for the cushion element with metal or plastic for the housing. This composite approach allows the housing to be made of lighter materials like plastic while the rubber cushion provides the necessary shock absorption, reducing overall weight and cost while maintaining strength
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 significantly reduces closing noise and pressure surges, extends the service life of the valve and associated components, and prevents noise propagation through connected pipes, enabling the use of plastic materials for the valve housing.
Implementation Method 1
a spring element which is operatively connected to the check valve in such a way that it exerts a force on it in the direction of its closed position
Implementation Method 2
the weight of the water column in the riser pipe causes the last waste water to flow back into the container
Implementation Method 3
releases a feed channel as a result of the feed pressure of the feed pump
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3a~3b
AI summary
The invention relates to a check valve assembly (10) for a domestic or commercial wastewater pumping station (1) with a collection tank (2) and a pump (3) for pumping wastewater from the collection tank (2) via a riser pipe (7) into a sewer, comprising a check valve (19) to prevent backflow into the collection tank (2) from the riser pipe after deactivation of the pump (3) and a base body (11) to which the check valve (19) is movably attached such that, starting from a closed position due to the delivery pressure of the pump (3), it opens a delivery channel (8). A spring element (14) is operatively connected to the check valve (19) in such a way that it exerts a force on it in the direction of its closed position.