Integrated Suck-Back Valve Timing for Leak-Free Fluid Retention
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Solution Overview
Problem
Existing suck-back valves face challenges in synchronizing the closing of fluid passages with the suck-back operation, leading to liquid leakage and delayed or incomplete suck-back due to complex control mechanisms and frictional forces.
Innovation Solution
A suck-back valve design with a suck-back mechanism unit featuring a suck-back piston that can move between dead center positions, allowing for gentle and quick suck-back operations by balancing forces without significant friction, and a reduced discharge of drive fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the opening/closing valve and suck-back valve are controlled individually, then the control precision is improved, but the device complexity increases
Solution Approach 1:
The patent combines the opening/closing valve and suck-back valve into a single integrated valve body, sharing common components such as the piston, cylinder chamber, and drive fluid passages. This merging reduces device complexity while maintaining synchronized control through a single actuator, eliminating the need for separate control mechanisms.
Solution Approach 2:
The single valve body performs multiple functions: it acts as both the opening/closing valve and the suck-back valve. The valve element provides both the closing function (by sealing against the valve seat) and the suck-back function (by moving within the cylinder chamber to create pressure differential), achieving multi-functionality in one component.
2Productivity
If the suck-back valve is operated quickly, then the productivity is improved, but the liquid leakage increases
Solution Approach 1:
The valve element is positioned to close the fluid passage before the suck-back piston begins its rapid retraction. This preliminary closing action prevents liquid from being forced out during the quick suck-back operation, allowing high-speed operation without leakage.
Solution Approach 2:
The valve element acts as an intermediary between the drive fluid pressure and the liquid in the outlet flow passage. By controlling the valve element's position, the system mediates between the need for rapid suck-back and the need to prevent liquid leakage, enabling fast operation while maintaining seal integrity.
3Object-generated harmful factors
If the discharge flow rate of drive fluid is reduced, then the liquid leakage is reduced, but the suck-back operation becomes delayed
Solution Approach 1:
The suck-back operation is segmented into two phases: an initial phase where the valve element closes the passage quickly to prevent leakage, and a subsequent phase where the suck-back piston retracts to create the pressure differential. This segmentation allows the system to achieve both rapid response and leakage prevention.
Solution Approach 2:
The system dynamically adjusts the operation sequence: the valve element closes first (static seal), then the suck-back piston moves (dynamic volume change). This dynamic coordination allows the system to maintain zero leakage while achieving rapid suck-back without requiring reduced drive fluid flow rate.
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 early and gentle suck-back operations, reducing liquid leakage and ensuring efficient fluid retention within the system.
Implementation Method 1
the suck-back piston that can move between dead center positions, allowing for gentle and quick suck-back operations by balancing forces without significant friction
Implementation Method 2
a suck-back mechanism unit which sucks back the fluid from the outlet flow passage by increasing the volume of the suck-back chamber
Data Source
AI summary
A suck-back valve includes a valve main body formed with a suck-back chamber, and a suck-back mechanism unit. The suck-back mechanism unit includes a suck-back piston accommodated in a suck-back cylinder chamber and being slidable between two dead center positions, and a biasing member biasing the suck-back piston in a direction to increase the volume of the suck-back chamber. The suck-back cylinder chamber is divided by the suck-back piston into a first fluid chamber and a second fluid chamber. The biasing member is arranged in the first fluid chamber, and a standby position at which the suck-back piston is positioned when the pressure of a drive fluid in the second fluid chamber becomes the maximum is set to be away from the dead center position on the side closer to the suck-back chamber.