Check Valve Segmented Disk Design for Water Hammer
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Solution Overview
Problem
Conventional check valves experience noise, vibration, and water hammer due to rapid backflow when closed, and slow closing functions increase backflow time and speed, leading to inefficiencies and potential damage.
Innovation Solution
A check valve design featuring a main disk for rapid closing and an auxiliary disk for slow closing, with a shock-absorbing damper system to manage the closing process, reducing backflow and minimizing pressure increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the check valve uses rapid closing to prevent backflow, then backflow prevention is improved, but noise, vibration, and water hammer occur
Solution Approach 1:
The valve disk is divided into two separate components: a main disk for rapid closing and an auxiliary disk for slow closing. The main disk quickly closes the main passage to prevent backflow, while the auxiliary disk slowly closes the bypass passage to dissipate energy and reduce water hammer effects. This segmentation allows the system to achieve both rapid backflow prevention and reduced harmful effects.
Solution Approach 2:
The auxiliary disk acts as an intermediary element between the rapid closing action of the main disk and the fluid flow. By providing a controlled bypass passage that gradually closes, it mediates the sudden pressure changes and energy release that would otherwise cause water hammer, noise, and vibration.
2Object-generated harmful factors
If the check valve uses slow closing to reduce water hammer, then noise and vibration are reduced, but backflow time and speed increase
Solution Approach 1:
The closing function is segmented into two phases: rapid closing by the main disk to minimize backflow time, and slow closing by the auxiliary disk to reduce water hammer. This segmentation allows the system to achieve both rapid backflow prevention and reduced harmful effects without compromising either objective.
Solution Approach 2:
The auxiliary disk provides a partial closing action through the bypass passage while the main disk completes the full closing. This partial action allows energy dissipation without requiring the entire valve to close slowly, thus minimizing backflow time while still reducing water hammer effects.
3Object-generated harmful factors
If a shock-absorbing damper is connected to the rotation shaft to provide slow closing, then collision noise is reduced, but the disk closing speed is slowed from the beginning increasing backflow amount
Solution Approach 1:
The valve system is segmented into two independent disk mechanisms: the main disk connected to the rotation shaft for rapid closing, and the auxiliary disk with its own shaft for slow closing. This segmentation allows the shock-absorbing damper to affect only the auxiliary disk's closing speed, while the main disk maintains rapid closing to minimize backflow amount.
Solution Approach 2:
The auxiliary disk with shock-absorbing damper acts as an intermediary that handles the energy dissipation function separately from the main backflow prevention function. This allows the main disk to close rapidly without being affected by the damper's slowing effect, thus minimizing backflow while still reducing collision noise through the auxiliary disk's controlled closing.
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 effectively reduces backflow, noise, and vibration, preventing water hammer by controlling the closing speed of the auxiliary disk and distributing pressure through a flow hole, thereby enhancing the check valve's operational efficiency and safety.
Implementation Method 1
a shock-absorbing damper 150 being connected to the auxiliary disk shaft 138, and slowly closing the auxiliary disk 136 by exerting a force in a direction opposite to a closing direction of the auxiliary disk 136
Implementation Method 2
a main disk 130 opening or closing the passage 113 by being rotated inside the valve body 110
Implementation Method 3
an auxiliary disk 136 opening or closing the flow hole 132 of the main disk 130 by being rotated inside the valve body 110
Implementation Method 4
reducing the velocity of backflow inside a conduit, right before the disks are finally closed
Data Source
AI summary
The present invention relates to a check valve and, more particularly, to a check valve comprising a main disk and a separate auxiliary disk, the main disk making a rapid closing operation, and the auxiliary disk, which has an area smaller than that of the main disk, making a slow closing operation, thereby reducing the velocity of a reverse flow inside a conduit, right before the disks are finally closed, and preventing a slam (a characteristic phenomenon wherein, when the disks are closed with a bang, an instantaneous increase in pressure wave raises the possibility of piping fracture and causes noise and vibration) of the disks and water hammer.