Semicircular Groove Piston Cap for Flush Valve Pressure Balance
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Solution Overview
Problem
Commercial flush valves often experience issues with water hammer and failure to shut off due to sudden changes in water momentum, and they lack effective anti-backflow prevention, which can contaminate the potable water supply.
Innovation Solution
The flush valve design incorporates a piston with a semicircular groove in the piston cap to minimize fluid flow restriction and reduce turbulence, combined with an anti-backflow cartridge featuring series anti-backflow check valves to prevent backflow, replacing traditional vacuum breakers and enhancing sealing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional groove design is used in the piston cap, then pressure equalization is achieved, but fluid flow restriction and turbulence increase causing water hammer
Solution Approach 1:
The groove in the piston cap is designed with a semicircular cross-section instead of a traditional rectangular or linear shape. This curved geometry allows fluid to flow more smoothly through the groove, reducing turbulence and preventing water hammer while still achieving the necessary pressure equalization between the inlet and outlet sides of the piston.
2Reliability
If the groove is made deeper or larger to improve pressure equalization, then pressure balance is enhanced, but fluid flow restriction increases
Solution Approach 1:
The groove dimensions are carefully optimized with specific parameters: a depth of approximately 0.006 inches and a diameter of about 0.040 inches. These precise dimensional parameters achieve effective pressure equalization while minimizing fluid flow restriction, balancing the competing requirements of pressure balance and flow quantity.
3Object-affected harmful factors
If traditional vacuum breakers are used for anti-backflow prevention, then backflow protection is provided, but sealing efficiency is insufficient leading to potential contamination
Solution Approach 1:
The anti-backflow function is divided into multiple check valves arranged in series within the discharge tube, rather than using a single vacuum breaker device. This segmentation provides redundant sealing points, enhancing sealing efficiency and preventing backflow contamination more reliably while maintaining the protective function.
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 water hammer by smoothing fluid flow and minimizes backflow contamination, ensuring reliable shut-off and extended valve life while maintaining adequate flushing performance.
Implementation Method 1
A groove is disposed in the piston cap wall for equalizing pressure on sides of the piston translating therein. The groove has a shallow, semicircular shape whereby a possibility that fluid flow therethrough is diminished is minimized.
Implementation Method 2
By opening the bypass valve, pressure above the piston drops and allows line pressure to lift the piston from its seat within the flush valve and channel water to flush a toilet, urinal or the like.
Implementation Method 3
Some plumbing codes require flush valves to have anti-backflow devices like a vacuum breaker to prevent fouling of the potable water supply in the event of backflow from the toilet or urinal fixture into the valve and the related water supply.
Data Source
AI summary
A flush valve has a valve body having an inlet and an outlet. A piston is disposed in the valve body between the inlet and the outlet. A piston cap is disposed within the valve body and has a wall along which the piston is guided. A groove is disposed in the piston cap wall for equalizing pressure on sides of the piston translating therein. The groove has a shallow, semicircular shape whereby a possibility that fluid flow therethrough is diminished is minimized.