Control Valve Spool Segmentation Prevents Cylinder Line Pressurization

Solution Overview

Problem

Current hydraulic lift control systems experience unintended pressurization of the hydraulic lift cylinder line due to oil leakage from the excess flow line, leading to unwanted movement of equipment, and existing solutions either fail to prevent this issue or increase response time, causing operational delays.

Innovation Solution

A control valve system with a spool design that directs leaked oil from the excess flow line to a non-pressurized tank line, preventing pressurization of the hydraulic lift cylinder line and avoiding unwanted movement by using a combination of main spool, flow divider spool, check valve, and discharge notches to manage fluid flow and pressure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the diametrical space between housing and spool is reduced, then the spool can be prevented from sticking in the housing, but pressurized oil leaks from the excess flow line to the hydraulic lift cylinder line causing unwanted cylinder pressurization

Engineering Contradiction:

Improvespool operation reliabilityVSAvoidoil leakage to cylinder line

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The control valve is segmented into distinct pressurized and non-pressurized zones using a partition wall. The spool is divided into a first spool portion exposed to pressurized oil and a second spool portion in a non-pressurized zone, preventing leak oil from pressurizing the cylinder line while maintaining adequate diametrical space for reliable spool operation

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A drain passage acts as an intermediary channel, collecting leak oil from the excess flow line and directing it to the tank line. This intermediary pathway prevents the harmful effect of oil leakage from affecting the hydraulic lift cylinder line while maintaining the necessary diametrical clearance

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If lapping distances between housing and spool are increased to prevent oil leakage, then pressurization of cylinder line is delayed, but response time of hydraulic system increases causing late equipment response

Engineering Contradiction:

Improveoil leakage preventionVSAvoidhydraulic system response time

Core Design Contradiction:

Object-affected harmful factorsVSLoss of time

Solution Approach 1:

The control valve is segmented into distinct pressurized and non-pressurized zones using a partition wall. The spool is divided into a first spool portion exposed to pressurized oil and a second spool portion in a non-pressurized zone, preventing leak oil from pressurizing the cylinder line while maintaining adequate diametrical clearance

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The harmful factor of oil leakage is extracted and isolated into a separate drain passage that directs leak oil directly to the tank line. This extraction allows the main hydraulic path to maintain tight tolerances for fast response while the leak oil is separately managed without affecting system performance

Inventive Principle:

Principle #2Taking out (Extraction)

3Adaptability or versatility

If both excess flow line and hydraulic lift cylinder line are pressurized simultaneously, then both valves can be used simultaneously, but unintended pressurization of cylinder line occurs when only excess flow line should be pressurized

Engineering Contradiction:

Improvesimultaneous valve operationVSAvoidunintended cylinder movement

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The control valve is segmented into distinct pressurized and non-pressurized zones using a partition wall. The spool is divided into a first spool portion exposed to pressurized oil and a second spool portion in a non-pressurized zone, preventing leak oil from pressurizing the cylinder line while maintaining adequate diametrical clearance

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system provides inherent feedback through the partition wall design that prevents cross-contamination of pressure zones. When the excess flow line is pressurized, the partition wall and drain passage automatically redirect any leak oil to the tank, providing negative feedback that prevents unintended cylinder pressurization without requiring additional control mechanisms

Inventive Principle:

Principle #23Feedback

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

Effectively prevents unintended pressurization and movement of hydraulic lift cylinders, maintaining precise control over equipment positioning and reducing response time, thereby enhancing operational efficiency in agricultural machinery.

Implementation Method 1

directing the leak oil between the excess flow line and the hydraulic lift cylinder line to the non-pressurized tank line by help of a spool

Methodology Applied

Scientific EffectFluid flow:

Implementation Method 2

directing the leak oil between the excess flow line and the hydraulic lift cylinder line to the non-pressurized tank line

Methodology Applied

Scientific EffectPressure differential: Pressure Gradient

Data Source

PatentUS10202985B2System preventing pressured oil leakage to cylinder line in control valve systems with flow divider

Publication Date: 2019.02.12 HEMA ENDUSTRI ANONIM SIRKETI

AI summary

The present invention relates to a system preventing the pressured oil leakage in a cylinder line enabling very low leakage rates without using the valve or the system, or without reducing the diametrical space between the housing and spool.