Hydraulic Gate Valve Bypass for Manual Operation
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Solution Overview
Problem
Existing oil-hydraulic systems for moving gates face difficulties in manual movement when the pump is stopped, requiring significant effort due to high resistance, and risk loss of control during automated operation due to simultaneous manual intervention.
Innovation Solution
An oil-hydraulic system featuring a double-acting oil-hydraulic cylinder and an electro-hydraulic pump with a switching valve that automatically connects the cylinder to either the pump or a tank, allowing free manual movement by disconnecting from the tank during pump actuation, ensuring smooth operation and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pump is stopped and the gate needs to be moved manually, then the gate can be moved without automation interference, but the oil has to be forced through the pump which behaves like a bottleneck causing very low manual movement speed and considerable effort
Solution Approach 1:
The patent extracts the pump from the manual movement path by providing a bypass circuit that allows oil to flow around the pump when it is stopped. This eliminates the bottleneck effect of the pump during manual operation, enabling free manual movement of the gate without having to force oil through the stopped pump.
Solution Approach 2:
The patent introduces a bypass valve as an intermediary element that mediates between the cylinder and the pump. When the pump is stopped, the bypass valve opens to allow oil to flow through the bypass circuit, providing a low-resistance path for manual gate movement without interfering with the stopped pump.
2Ease of operation
If the system allows free manual movement of the gate, then manual operation is easy, but it risks loss of control during automated operation due to simultaneous manual intervention
Solution Approach 1:
The patent makes the system dynamically adaptive by using a pressure-actuated mechanism that automatically switches between manual and automated modes. When the pump operates, the generated pressure automatically closes the bypass valve, preventing manual intervention during automated operation. When the pump stops, pressure drops and the bypass valve opens, enabling manual movement. This dynamic behavior ensures control reliability during automation while maintaining manual freedom when needed.
Solution Approach 2:
The patent implements a feedback mechanism where the pump's operating status (indicated by pressure) automatically controls the bypass valve state. The pressure signal from the pump operation feeds back to the bypass valve, causing it to close when the pump is running and open when stopped. This feedback ensures that manual intervention is automatically prevented during automated operation, maintaining control reliability.
3Ease of operation
If an unlocking device is added to allow manual movement, then manual operation becomes possible, but the device complexity increases and users must act upon the unlocking device
Solution Approach 1:
The patent implements a self-service mechanism where the bypass valve automatically responds to the pump's operating status without requiring user intervention. The valve self-activates based on pressure feedback from the pump, opening when the pump stops and closing when it runs. This eliminates the need for separate unlocking devices or manual switching operations, reducing device complexity while maintaining manual movement capability.
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
Enables smooth manual gate movement without automation interference and maintains control during automated operation, reducing operator effort and ensuring safety without the need for unlocking devices.
Implementation Method 1
the valve being automatically controlled by the pressure variations in the system that are produced by the actuation of the pump
Data Source
AI summary
An oil-hydraulic system for moving a gate, comprises a double-acting oil-hydraulic cylinder (11), which is intended to be kinematically connected to the gate to move it, and an electro-hydraulic pump (12) to feed and actuate the cylinder upon command. A switching valve (13) interconnects the cylinder (11) alternatively with the pump (12) or with a tank (14) of oil-hydraulic fluid. In rest conditions, the valve (13) connects the cylinder (11) to the tank (14), to allow free manual movement of a gate connected to the cylinder, and it is automatically controlled by the pressure variations in the system that are produced by the actuation of the pump (12) to disconnect the cylinder (11) from the tank (14) and connect it to the pump (12).