RO Control Valve Piston Material for Stable Drain Venting

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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 operational issues such as uncontrolled water drainage and phantom noise, and are not suited for modern high-output reverse osmosis systems.

Innovation Solution

The control valve employs acetal plastics like Delrin for the piston, which maintains stability and dimensional accuracy over a wide temperature range, and incorporates chamfered vent/drain wells and recesses to improve functionality and reduce noise.

Engineering Contradictions & Design Principles

VSEngineering 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

Engineering Contradiction:

Improveoperational capability in reverse osmosis systemsVSAvoiddimensional stability over temperature range

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The patent changes the material parameter from Teflon to acetal plastic, which has superior dimensional stability and lower thermal expansion characteristics. This material substitution resolves the contradiction by maintaining dimensional tolerances across varying temperature ranges while preserving operational capability in reverse osmosis control valves.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs acetal plastic as a composite material solution that combines dimensional stability, thermal stability, and suitability for control valve operation. This composite material approach resolves the contradiction between operational versatility and dimensional stability by selecting a material that inherently possesses both required properties.

Inventive Principle:

Principle #40Composite materials

2Device complexity

If existing control valve designs are used, then the system structure is simple, but uncontrolled water drainage and phantom noise occur

Engineering Contradiction:

Improvevalve structure simplicityVSAvoidcontrol precision and noise reduction

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent segments the valve internal structure by introducing a stepped valve seat and multi-position piston design. This segmentation allows precise control at different stages of the valve operation, preventing uncontrolled drainage and reducing phantom noise while maintaining relatively simple overall structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by creating different surface finishes and geometries at specific locations within the valve. The stepped valve seat provides different control characteristics at different positions, enabling precise flow control and eliminating phantom noise without requiring complete structural complexity throughout the entire valve.

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If conventional piston materials are used, then manufacturing is easier, but the pistons do not maintain dimensional tolerances leading to operational issues

Engineering Contradiction:

Improvepiston fabrication simplicityVSAvoiddimensional tolerance maintenance

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent changes the material parameter from Teflon to acetal plastic, which offers both ease of manufacture through common molding processes and superior dimensional stability. This material parameter change resolves the contradiction by providing a material that is manufacturable with standard techniques while maintaining precise dimensional tolerances during operation.

Inventive Principle:

Principle #35Parameter changes

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 ensures reliable operation across temperature variations, prevents uncontrolled drainage, and reduces phantom noise, enabling efficient water production and dispensing in high-output reverse osmosis systems.

Implementation Method 1

acetal plastics like Delrin for the piston, which maintains stability and dimensional accuracy over a wide temperature range

Methodology Applied

Scientific EffectThermal stability: Thermal Expansion

Implementation Method 2

reverse osmosis system control valves

Methodology Applied

Scientific EffectReverse osmosis: Reverse Osmosis

Data Source

PatentUS11673092B2Reverse osmosis system control valves

Publication Date: 2023.06.13 TOPPER MANUFACTURING CORP

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 and at least one recess disposed around an end of the control piston. 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.