Water-on-water RO Valve Pressure Regulation
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Solution Overview
Problem
Current water-on-water filtration systems face challenges such as reduced pressure differential and variable flow rates due to back pressure from air compartments in air-on-water systems, and issues like valve stalling and chatter during low demand flow rates in water-on-water systems.
Innovation Solution
A filtration system with a water-on-water storage tank and a valve or combination of valves that regulates flow based on pressure in the product line, featuring at least three states to manage feed, product, and reject water flows efficiently, using a shuttle or multiport valve with a piston body and check valves to maintain hold pressure and control fluid paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the valve has multiple states to handle varying flow demands, then adaptability improves, but device complexity increases
Solution Approach 1:
The valve system is self-regulating through pressure-driven state transitions. The valve automatically moves between states based on pressure differential and tank fill level without requiring external control systems or complex electronics. This self-service approach achieves adaptability to varying flow demands while minimizing device complexity by using passive pressure-responsive mechanisms.
Solution Approach 2:
The valve utilizes hydraulic pressure from the water system itself to control state transitions. Pressure differential across the filter element and tank pressure serve as the actuating forces for valve positioning, eliminating the need for external actuators, motors, or complex control mechanisms. This pneumatic/hydraulic approach provides adaptability while keeping the device relatively simple.
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 system provides a consistent flow rate and improved water quality by reducing back pressure and valve stalling, ensuring efficient operation during varying demand conditions and simplifying startup procedures.
Implementation Method 1
a reverse osmosis filter module to provide filtered output water for consumption or other use
Implementation Method 2
a water-on-water storage tank comprising a squeeze side and a product side separated by a membrane
Implementation Method 3
a valve or a combination of valves that regulates the flow from the feed source, wherein pressure in the product line determines the state of the valve or the combination of valves
Implementation Method 4
a second compartment contains 'squeeze' water. A physical separation between the compartments is movable or flexible so that water pressure in the first compartment is influenced by the water pressure in the second compartment
Data Source
AI summary
Described are water-on-water valves for use in reverse osmosis filtration systems. The water-on-water valves are regulated by the pressure in a product line, which contains fluid from a product line of the filter module and/or the product side of a water-on-water storage tank. Exemplary valves are shuttle valves that are regulated by the pressure downstream of the product side of a reverse osmosis filter module. The valves may comprise a piston within a housing, and an end of the piston may have an enlarged diameter relative to the maximum diameter of the remainder of the piston. The body of the piston may have sections of differing diameters, where the smaller diameter sections form flow channels, or the body may a diameter that is substantially the same along its length in conjunction with gratings and flow channels.