Hydraulic Valve Pre-Post Compensation Chassis

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Solution Overview

Problem

Current hydraulic valve arrangements lack flexibility in compensating fluid flow, as they are typically designed for either pre-compensation or post-compensation, limiting their adaptability to different operational demands without requiring multiple chassis body designs.

Innovation Solution

A hydraulic valve arrangement that can be selectively configured for either pre-compensation or post-compensation using the same chassis body, by switching between different main spools and compensator spools, allowing for adaptable fluid flow management without altering the chassis body.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a hydraulic valve arrangement is designed for pre-compensation, then priority is given to lower load drives, but higher load drives are slowed or stopped

Engineering Contradiction:

Improvepriority to lower load driveVSAvoidspeed of higher load drive

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The system dynamically switches between pre-compensation and post-compensation modes based on operational requirements. The compensation arrangement can be reconfigured from upstream (pre-compensation) to downstream (post-compensation) of the metering orifice, allowing the system to adapt its flow control characteristics in real-time rather than being fixed in one mode

Inventive Principle:

Principle #15Dynamics

2Productivity

If a hydraulic valve arrangement is designed for post-compensation, then all drives are proportionally reduced during flow saturation, but no priority is given to any drive

Engineering Contradiction:

Improveproportional speed reduction of all drivesVSAvoidpriority to any drive

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

Inventive Principle:

Principle #15Dynamics

3Adaptability or versatility

If separate chassis body designs are produced for pre-compensation and post-compensation systems, then each system is optimized for its specific function, but manufacturing efficiency decreases

Engineering Contradiction:

Improvespecific function optimizationVSAvoidmanufacturing efficiency

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

A single chassis body design incorporates a compensation arrangement that can function in both pre-compensation and post-compensation modes. The compensation spool and associated components are designed to be reconfigurable, allowing the same physical hardware to perform multiple compensation functions depending on system requirements

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The compensation arrangement is designed as a separable, modular component within the chassis body. The compensation spool can be removed and replaced with different types (pre-compensation or post-compensation) while using the same chassis body, allowing manufacturing efficiency while maintaining functional optimization

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS9200647B2Pre- and post- compensational valve arrangement

Publication Date: 2015.12.01 DANFOSS AS

AI summary

Hydraulic valve arrangements may be assembled to provide pre-compensation or post-compensation using the same chassis body. A first type of main spool is disposed in a main passage and a first type of pressure compensator spool is disposed in a compensator passage to provide pressure pre-compensation. The first type of pressure compensator spool connects to a first pilot location and not to a second pilot location. A second type of main spool is disposed in the main passage and a second type of pressure compensator spool is disposed in the compensator passage to provide pressure post-compensation. The second type of pressure compensator spool connects to the second pilot location and not to the first pilot location. The valve arrangement may be switched from pre-compensation to post-compensation (or vice versa) by switching out the main spool and pressure compensator spool without making any other changes to the chassis body.