Load-Sensing Multi-Way Valve With Variable Differential Pressure Control
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Solution Overview
Problem
Conventional load-sensing multi-way valves face issues with poor controllability and flow mismatch due to constant compensated differential pressure, leading to inefficiencies and control difficulties in engineering machinery, especially during varying load conditions and flow saturation.
Innovation Solution
A load-sensing multi-way valve with a variable differential pressure system, incorporating an electro-hydraulic pressure compensation valve with a displacement sensor and spool lands, allows for real-time adjustment of compensated differential pressure through pilot-operated pressure reducing valves, enabling continuous control and feedback for improved system controllability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional pressure compensation valve with constant compensated differential pressure is used, then the system structure is simple, but the controllability is poor and flow distribution accuracy is low
Solution Approach 1:
The patent transforms the constant compensated differential pressure into a variable one by introducing a controllable pressure reducing valve. The differential pressure can now be dynamically adjusted based on system conditions, improving flow distribution accuracy while maintaining reasonable structural complexity through integrated control.
Solution Approach 2:
The patent incorporates position feedback of the compensation valve trim to enable intelligent control. This feedback mechanism allows the system to monitor and adjust the compensated differential pressure in real-time, significantly improving flow distribution accuracy through closed-loop control.
2Force
If a high compensated differential pressure is used, then the system can handle heavy loads, but the control difficulty increases and throttling losses increase
Solution Approach 1:
The patent enables dynamic adjustment of compensated differential pressure through the controllable pressure reducing valve. The system can adapt the differential pressure level according to actual load conditions, maintaining high load handling capability while reducing control difficulty and throttling losses during lighter operations.
Solution Approach 2:
The patent changes the compensated differential pressure parameter from fixed to variable. By adjusting this parameter in real-time based on system conditions, the system optimizes the balance between load handling capability and control ease, avoiding excessive differential pressure during light loads.
3Ease of operation
If a low compensated differential pressure is used, then the control precision is improved, but the actuator response becomes slow and working efficiency decreases
Solution Approach 1:
The patent enables dynamic adjustment of compensated differential pressure to match different operating conditions. During positioning and inching operations, lower differential pressure provides precise control, while during rapid movement operations, higher differential pressure ensures fast actuator response, thus maintaining both control precision and productivity.
Solution Approach 2:
The patent adjusts the compensated differential pressure parameter dynamically based on required actuator response speed. This parameter change strategy ensures that control precision is maintained during delicate operations while productivity is preserved during rapid movement tasks.
4Adaptability or versatility
If a conventional load sensitivity control technology is used, then the system can operate with multiple actuators, but flow saturation and flow mismatch problems occur
Solution Approach 1:
The patent incorporates position feedback of the compensation valve trim to enable intelligent control in multi-actuator systems. This feedback allows real-time adjustment of compensated differential pressure, preventing flow saturation and ensuring accurate flow distribution across multiple actuators, thus improving reliability.
Solution Approach 2:
The patent enables dynamic adjustment of compensated differential pressure to adapt to varying demands of multiple actuators. This dynamic control prevents flow saturation conditions and ensures accurate flow distribution, maintaining high reliability in multi-actuator operations.
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 enhances controllability and flow distribution accuracy, reduces throttling losses, and improves actuator response and coordination, effectively addressing the limitations of conventional systems by allowing proportional shunting and real-time pressure compensation.
Implementation Method 1
the displacement sensor is arranged on the compensation valve trim through the compensation valve body, and directly detects a position X and a velocity XV of the valve trim
Implementation Method 2
one end of the spring acts on a left end surface C of the compensation valve trim, and the other end thereof acts on the compensation valve body
Implementation Method 3
an electro-hydraulic pressure compensation valve (11) and a first pilot-operated pressure reducing valve (12)
Data Source
AI summary
The present invention discloses a load-sensing multi-way valve with a variable differential pressure, where each valve group uses a new element: an electro-hydraulic pressure compensation valve, so as to implement continuous real-time adjustment and control of compensated differential pressure and real-time position feedback and monitoring of a compensation valve trim, and overcome a flow mismatch problem of a conventional LS system in a flow saturation working condition and problems of a fixed shunting proportion of an LUDV system and poor operation coordination of actuators. The load-sensing multi-way valve with a variable differential pressure disclosed in the present invention has advantages such as strong working condition applicability, high flow distribution accuracy, and strong technicality.