Pilot Valve Shut-Off for Mobile Hydraulic Leak Isolation
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Solution Overview
Problem
Mobile hydraulic construction machines experience significant hydraulic oil loss due to leaks in their long hoses, which can lead to environmental pollution and safety risks, as existing solutions do not effectively prevent large-scale oil escape during operation.
Innovation Solution
A valve arrangement that includes directional control valves and pilot valves connected to pressure and relief lines, allowing for automatic shut-off of hydraulic lines in case of leakage, preventing oil from escaping and enabling continued operation of the machine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing solutions interrupt only the attachment side of the hydraulic system, then the attachment remains in a fixed position and does not pose safety risks, but large amounts of hydraulic oil (over 400 liters) can escape in less than half a minute causing environmental pollution and additional costs
Solution Approach 1:
The hydraulic system is segmented into multiple controllable sections by introducing directional control valves at strategic locations (boom, arm, attachment). This segmentation allows isolated shutdown of specific leaking sections while maintaining operation of other sections, preventing total system shutdown and minimizing oil loss from the entire system.
Solution Approach 2:
Directional control valves act as intermediary devices between the hydraulic pump and the hydraulic consumer. These valves serve as control points that can redirect or block hydraulic flow, enabling rapid response to leaks by shutting off flow to affected areas while maintaining flow to unaffected areas.
2Reliability
If directional control valves are equipped with pilot lines connected to pressure and relief lines, then the valve can be automatically transferred to shut-off position in case of leakage, but the device complexity increases
Solution Approach 1:
The directional control valve is equipped with pilot lines that automatically detect pressure changes caused by leaks and self-actuate to the shut-off position without external intervention. The valve uses its own hydraulic pressure system to trigger the shutdown, eliminating the need for external sensors or control systems.
Solution Approach 2:
The pilot lines provide continuous feedback on the hydraulic pressure status to the directional control valve. When a leak causes pressure drop or abnormal pressure conditions, this feedback automatically triggers the valve to switch to shut-off position, creating a closed-loop safety mechanism.
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 valve arrangement effectively minimizes hydraulic oil loss by ensuring the directional control valve remains in a shut-off position until the leakage is rectified, preventing oil from escaping and allowing the machine to continue operating safely, thus reducing environmental impact and operational costs.
Implementation Method 1
a pilot valve (59) connected to the control line (58), a pressure supply line (66) and a pressure relief line (62), the pilot valve (59) being structured to connect the control line (58) alternately to the pressure supply line (66) and the pressure relief line (62)
Data Source
AI summary
A valve arrangement for a mobile working machine includes a hydraulic consumer with at least one directional control valve connected to a pressure line and a working line of the hydraulic consumer and including a hydraulic control line to move the at least one directional control valve to a first position, a pilot valve connected to the hydraulic control line, a pressure supply line, and a pressure reduction line. The pilot valve is structured to connect the hydraulic control line alternately to the pressure supply line and the pressure reduction line.