Reverse Osmosis Control Valve Piston for Stable High-Rate Output
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Solution Overview
Problem
The existing reverse osmosis control valves, particularly those using Teflon pistons, are unstable over varying temperature ranges and fail to maintain dimensional tolerances, leading to system drainage issues, and are not designed for high production rates exceeding 15 gallons per day, causing operational inefficiencies and incomplete water production.
Innovation Solution
The control valve employs acetal plastics, such as Delrin, for the piston and incorporates chamfered vent/drain wells to stabilize the piston movement and prevent O-ring catching, ensuring operational stability across temperature ranges and supporting higher production rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Teflon pistons are used in control valves, then the valves can operate in reverse osmosis systems, but the pistons become unstable over varying temperature ranges and fail to maintain dimensional tolerances
Solution Approach 1:
The patent changes the material parameter from Teflon to acetal plastic, which has superior dimensional stability across temperature ranges. This material substitution resolves the contradiction by maintaining manufacturing precision while preserving adaptability to varying temperature conditions.
Solution Approach 2:
The patent employs acetal plastic, a composite material with enhanced dimensional stability and temperature resistance compared to Teflon. This material choice simultaneously achieves both dimensional tolerance maintenance and broad temperature range operation.
2Productivity
If control valves are designed for traditional production rates, then they can maintain simplicity, but they cannot support high production rates exceeding 15 gallons per day
Solution Approach 1:
The patent introduces a movable piston mechanism with multiple positions (first position for production, second position for dispensing) that dynamically adjusts valve operation based on system needs. This dynamic design enables high production rates while managing complexity through controlled movement rather than static complex structures.
Solution Approach 2:
The valve design segments the operation into distinct phases using the piston's positional states, allowing independent optimization of production and dispensing functions. This segmentation enables high productivity during production phases without requiring permanently complex structures.
3Productivity
If the piston moves quickly to enable high production rates, then water production increases, but O-rings may get caught on piston edges causing operational instability
Solution Approach 1:
The patent applies chamfering (creating angled surfaces) to the piston edges where O-rings contact, replacing sharp 90-degree edges with smooth transitional surfaces. This geometric modification prevents O-ring catching while maintaining quick piston movement for high production rates.
Solution Approach 2:
The patent changes the geometric parameter of the piston edges from vertical 90-degree corners to chamfered angles, which eliminates the catching issue. This parameter change maintains operational stability while preserving the speed necessary for high productivity.
Data Source
AI summary
A control valve for a reverse osmosis water purifying system provides a feed water port, a squeeze water port, a drain port, and a product water connection, each of which open into a bore. A first, second, and third O-rings are located in the bore successively between the feed water port, the squeeze water port, the drain port, and the product water connection. A control piston is moveably located in the bore of the housing. The control piston includes a vent/drain well in which a side is chamfered. The vent/drain well provides a fluid passage between the squeeze water port and the drain port when the vent/drain well passes over the second O-ring. The fluid passage includes an opening formed between the second O-ring and the chamfered side of the vent/drain well, where the size of the opening is responsive to the position of the control piston.