Pressure Compensation Valve with Fast High-Load Pressure Shutoff
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Solution Overview
Problem
Existing pressure compensation valves in hydraulic drive circuits face challenges in responsiveness, particularly when high load pressures are rapidly generated, leading to potential application of high load pressure to the pressure supply source due to inadequate back pressure adjustment.
Innovation Solution
A pressure compensation valve design incorporating a load pressure spring, poppet portion, spool portion with throttle passage, and lead-out pressure chamber, which allows for dynamic pressure management by selecting the higher pressure side and applying it to the load pressure chamber, ensuring immediate closure of the valve body when high load pressures are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pressure compensation valve is used with a movable sleeve to select higher pressure, then pressure compensation is achieved, but responsiveness is slow when high load pressure is rapidly generated
Solution Approach 1:
The valve body is divided into two functional parts: a spool portion for pressure selection and a poppet portion for flow control. This segmentation allows the spool to respond rapidly to pressure changes and select the higher pressure, while the poppet handles the main flow control, achieving both reliability and responsiveness.
Solution Approach 2:
The spool portion preliminarily selects the higher pressure between lead-in port and lead-out port and applies it to the load pressure chamber before the poppet portion needs to close. This preliminary action ensures that when high load pressure is rapidly generated, the back pressure is already established, enabling immediate poppet closure and preventing high pressure application to the pressure supply source.
2Device complexity
If back pressure is not dynamically adjusted, then valve structure is simple, but high load pressure can be applied to pressure supply source during rapid pressure changes
Solution Approach 1:
The lead-out pressure chamber provides continuous feedback about the pressure at the lead-out port to the load pressure chamber through the throttle passage. This feedback mechanism ensures that the back pressure on the valve body dynamically reflects the actual load pressure, preventing high load pressure from being applied to the pressure supply source while maintaining a relatively simple valve structure.
Solution Approach 2:
The spool portion acts as an intermediary between the lead-in port and lead-out port pressure systems. It selectively connects the higher pressure side to the load pressure chamber, mediating the pressure interaction and preventing harmful high pressure application to the supply source while maintaining structural simplicity.
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 design enhances the responsiveness of the valve body by applying the higher pressure to the load pressure chamber, preventing high load pressures from being applied to the pressure supply source, even during rapid changes in load pressure.
Implementation Method 1
a load pressure spring that is interposed between the case and the valve body and that biases the valve body in a closing direction
Implementation Method 2
the spool portion is provided with a throttle passage that constantly communicates with the lead-in port and that opens toward a sliding portion with respect to the case
Implementation Method 3
a lead-out pressure chamber that presses the poppet portion in a closing direction in a case where an internal pressure increases
Data Source
AI summary
In a pressure compensation valve, a spool portion of a valve body is provided with a throttle passage that constantly communicates with a pump port. A case is provided with supply pressure communication passages to block space between the throttle passage and a load pressure chamber when a poppet portion closes space between the pump port and a cylinder port by biasing force of a load pressure spring, and that, meanwhile, communicate between the throttle passage and the load pressure chamber via a throttle hole when the spool portion moves in an opening direction by a predetermined stroke. A lead-out pressure chamber that presses the poppet portion in a closing direction in a case where an internal pressure increases is provided between the poppet portion and the case, and a lead-out pressure passage that constantly communicates with the cylinder port is connected to the lead-out pressure chamber.