Hydraulic Valve Pressure Routing for Consistent Multi-Function Control
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Solution Overview
Problem
Fluid control devices with closed center circuit types, employing both main and secondary relief valves, face complexity and increased size due to the need for multiple passages and parts to manage hydraulic fluid pressure across multiple fluid control valves, leading to inconsistent operability when multiple functions are simultaneously used.
Innovation Solution
A fluid control device configuration with a main relief valve for the maximum load pressure and a secondary relief valve for other pressures, utilizing a first and second passage connected through check valves and a passage switching unit, such as a shuttle valve, to manage hydraulic fluid pressure without increasing device complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple relief valves are provided for different pressure requirements, then pressure control precision is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple relief valve functions into a single integrated relief valve assembly. The first relief valve and second relief valve are integrated within the same valve body, sharing common structural elements and control mechanisms. This merging approach maintains the ability to provide different pressure controls for maximum pressure functions and other functions while reducing the overall number of separate components and simplifying the device structure.
2Measurement precision
If separate passages are provided for load sensing and relief functions, then pressure management precision is improved, but device size increases
Solution Approach 1:
The patent designs passages that serve multiple functions simultaneously. The load sensing passages are configured to also serve as relief passages, allowing the same fluid pathway to perform both load sensing for pressure compensation and pressure relief operations. This multi-functionality eliminates the need for completely separate passage systems, thereby maintaining precise pressure management while reducing the overall device size and component count.
3Ease of operation
If multiple pressure compensation valves are provided, then operability consistency is improved, but assembly steps increase
Solution Approach 1:
The patent integrates multiple pressure compensation valves into a single valve body structure. The first pressure compensation valve and second pressure compensation valve are combined, sharing common mounting interfaces, sealing structures, and adjustment mechanisms. This integration maintains the ability to provide consistent operability across different functions by ensuring proper pressure compensation for each, while significantly reducing the number of separate assembly operations required compared to providing completely separate pressure compensation valves for each function.
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
This configuration allows for consistent operability across functions with varying load pressures without complicating the device, reducing size and assembly steps by using shared passages for load sensing and relief, ensuring optimal pressure management regardless of simultaneous function operation.
Implementation Method 1
check valves disposed in respective passages connecting the load handling lines of the plurality of fluid control valves other than the fluid control valve having the maximum load pressure among the plurality of fluid control valves and the second passage
Implementation Method 2
a passage switching unit configured to send a hydraulic fluid having a higher pressure out of the hydraulic fluid in the load handling line of the fluid control valve having the maximum load pressure among the plurality of fluid control valves and the hydraulic fluid in the second passage to the main relief valve and the pressure compensation valves
Implementation Method 3
a relief valve is used to prevent the liquid pressure of a hydraulic fluid from excessively increasing
Data Source
AI summary
When a fluid control valve is opened and closed, the port pressure of fluid control valve is guided to a main relief valve through a first passage, and its maximum pressure is controlled by the main relief valve. At the same time, the port pressure of fluid control valve is guided to pressure compensation valves of the respective fluid control valves. As a result, even when functions having different load pressures are simultaneously operated in the fluid control valves, constant operability can be always secured without depending on the load pressures. In addition, when the fluid control valve, which drives a tilt cylinder for a function of tilting a fork, is opened and closed, the port pressure of the fluid control valve is guided to a secondary relief valve through a second passage, and is also guided to the main relief valve and the pressure compensation valves of the respective fluid control valves through the first passage.