Flow-Sharing Pressure Compensator Valve for Proportional Actuation
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Solution Overview
Problem
In hydraulic machinery, when multiple actuators are actuated simultaneously, the flow provided by the source is divided unevenly, leading to unpredictable and undesirable performance as the fluid flow to a particular actuator is no longer proportional to the operator's command.
Innovation Solution
A pressure compensator valve is introduced in each worksection, which responds to local and global pressure signals to maintain a constant pressure drop across the main control valve orifice, ensuring proportional fluid flow to each actuator even under simultaneous actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple actuators are actuated simultaneously without pressure compensation, then the flow is divided between actuators, but the flow distribution becomes unpredictable and non-proportional to operator commands
Solution Approach 1:
The pressure compensator valve incorporates feedback mechanisms where the load sense pressure (from the actuator) and pump pressure are fed back to the compensator spool. This feedback loop allows the compensator to automatically adjust the pressure drop across the main spool, ensuring that flow remains proportional to operator commands even when multiple actuators are actuated simultaneously.
Solution Approach 2:
The pressure compensator dynamically changes the pressure parameter by maintaining a constant pressure drop across the main control valve orifice. By adjusting the compensator spool position in response to varying load conditions, the system maintains consistent flow characteristics despite changes in system pressure and multiple actuator demands.
2Ease of operation
If a pressure compensator valve is added to maintain proportional flow, then flow proportionality is maintained, but device complexity increases
Solution Approach 1:
The pressure compensator valve is merged with the existing main control valve assembly, sharing common components such as the valve body, spool, and fluid passages. The compensator functionality is integrated into the same worksection, eliminating the need for separate external compensator devices and reducing overall system complexity.
Solution Approach 2:
The main control valve assembly is designed to perform multiple functions: directional control through the main spool and pressure compensation through the compensator spool. This multi-functionality is achieved by incorporating both control mechanisms within the same valve body, allowing a single component to handle both flow direction and pressure regulation.
3Manufacturing precision
If the pressure drop across the main valve orifice changes, then flow control precision is affected, but maintaining constant pressure drop requires additional control mechanisms
Solution Approach 1:
The compensator spool acts as an intermediary element between the load sense pressure and the main spool control. It mediates the pressure variations by adjusting its position to maintain a constant pressure drop across the main orifice, thereby protecting the flow control precision from pressure fluctuations without requiring complex external control systems.
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 pressure compensator valve ensures that the fluid flow to each actuator remains proportional to the operator's command, even when multiple actuators are actuated simultaneously, thereby maintaining predictable and desirable performance.
Implementation Method 1
A pressure compensator valve is introduced in each worksection, which responds to local and global pressure signals to maintain a constant pressure drop across the main control valve orifice
Data Source
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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.