Adjustable Flow-Sharing Pressure Compensator Valve for Proportional Flow
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Solution Overview
Problem
Existing hydraulic systems face issues with maintaining proportionality between operator commands and fluid flow to actuators when multiple actuators are actuated simultaneously, leading to unpredictable performance due to unequal distribution of fluid flow based on actuator loads.
Innovation Solution
A valve assembly with a pressure compensator valve that includes a compensator spool, pistons, and a compensator spring, which responds to multiple pressure signals to regulate fluid flow and maintain a constant pressure drop across the main control valve orifice, ensuring proportional fluid distribution among actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple actuators are actuated simultaneously without flow sharing control, then the actuator with the smallest load receives the highest amount of flow, but this leads to unpredictable and undesirable performance as the flow is no longer proportional to the operator command
Solution Approach 1:
The pressure compensator valve incorporates a load sense line that provides feedback about the pressure conditions in each worksection. This feedback mechanism allows the compensator to detect pressure differentials and adjust flow distribution accordingly, ensuring that flow remains proportional to operator commands even when multiple actuators are actuated simultaneously. The feedback loop enables the system to respond dynamically to changing load conditions.
Solution Approach 2:
The pressure compensator valve dynamically changes the flow resistance parameter in response to pressure differential signals from the load sense line. By adjusting the effective orifice area or flow resistance based on real-time pressure conditions, the system maintains proportional flow distribution across multiple actuators. This parameter adjustment ensures that actuators receive flow proportional to their commanded position rather than being dominated by load differences.
2Ease of operation
If a pressure compensator valve is added to regulate fluid flow and maintain constant pressure drop, then flow proportionality is improved, but device complexity increases
Solution Approach 1:
The pressure compensator valve is integrated directly into the worksection body, merging the compensator functionality with the existing valve structure. The compensator spool, load sense line, and pressure compensation mechanism are incorporated as part of the worksection assembly rather than as separate external components. This integration reduces overall system complexity while maintaining flow proportionality.
Solution Approach 2:
The pressure compensator valve performs multiple functions within a single component: it regulates fluid flow to maintain proportional distribution, senses pressure conditions through the load sense line, and automatically adjusts flow resistance based on pressure differentials. This multi-functionality eliminates the need for separate flow control valves and pressure sensing systems, reducing overall device complexity.
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 proportional fluid flow to actuators, maintaining predictable performance even in over-demand situations by adjusting fluid distribution based on global load conditions, enhancing compensator efficiency and flow sharing among multiple actuators.
Implementation Method 1
the compensator spool is configured to be subjected to a first fluid force in a proximal direction applied by fluid in the regulated flow passage and a second fluid force in a distal direction applied by fluid in the metered flow passage
Implementation Method 2
a pressure compensator valve... configured to regulate fluid flow from the inlet cavity to the main control spool
Implementation Method 3
a compensator spring applying a biasing force on the compensator spool
Implementation Method 4
a first piston coupled to a distal end of, and axially movable with, the compensator spool and configured to be subjected to a third fluid force in the proximal direction by a load-sense signal
Data Source
AI summary
An example pressure compensator valve includes: a compensator spool; a first piston coupled to a distal end of, and axially-movable with, the compensator spool; a second piston disposed at a proximal end of the compensator spool, wherein the compensator spool is axially movable relative to the second piston; and a compensator spring applying a biasing force on the compensator spool.