Cross-Free Switching Valve With Sliding-Rotary Flow Isolation

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Solution Overview

Problem

Existing reversing valves in sample injectors often cause fluid cross-contamination during switching, affecting the accuracy of sample analysis by allowing non-target fluids to come into contact with the sample.

Innovation Solution

A fluid cross-free switching valve design featuring a valve body with a rotatable valve core seat and slidably mounted rotor valve core, equipped with a groove system and drive assemblies to disconnect and reconnect fluid paths without contacting non-target connectors, preventing contamination.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional reversing valve is used to switch connectors, then the switching function is achieved, but fluid cross-contamination occurs because the valve contacts non-target connectors during switching

Engineering Contradiction:

Improvesample analysis accuracyVSAvoidfluid cross-contamination

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The valve core is divided into two independent parts: a rotatable valve core seat and a slidable rotor valve core. This segmentation allows the groove to disconnect from non-target connectors during rotation and reconnect only to the target connector, preventing fluid cross-contamination while maintaining switching functionality

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The rotor valve core acts as an intermediary between the rotating valve core seat and the fluid paths. By sliding the rotor valve core, the groove is disconnected from non-target connectors during the switching process, serving as a mediator that prevents direct contact between fluid from non-target connectors and the sample

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If the valve core rotates to switch connectors, then connector switching is achieved, but the groove may contact non-target connectors causing contamination

Engineering Contradiction:

Improveconnector switchingVSAvoidfluid cross-contamination

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The rotor valve core is slid to disconnect the groove from non-target connectors before the valve core seat rotates to the target position. This preliminary disconnection action prevents contamination from occurring during the switching process

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The valve core structure incorporates both rotational motion (valve core seat) and sliding motion ( rotor valve core). This dynamic combination allows the groove to be disconnected during rotation and selectively reconnected to the target connector, enabling contamination-free switching

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS11371625B2Fluid cross-free switching valve

Publication Date: 2022.06.28 NANJING RUNZE FLUID CONTROL EQUIP CO LTD

AI summary

A fluid cross-free switching valve includes a valve body, a first drive assembly and a second drive assembly. The valve body includes a valve head, a valve core seat and a rotor valve core. The valve core seat is rotatable relative to the valve head. The rotor valve core is slidably mounted on the valve core seat. The rotor valve core is fitted with the valve head. The valve head is provided with at least three reversing connectors. The rotor valve core is provided with a groove that is in communication with the reversing connector on a fitting surface of the rotor valve core and the valve head. The first drive assembly is able to drive the valve core seat to rotate, and the second drive assembly is able to drive the rotor valve core to slide.