Suck-back Valve Integrating Open/Close and Suck-back Functions
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Solution Overview
Problem
Conventional suck-back valves require separate open/close and suck-back valves, leading to increased installation space and synchronization issues, with low liquid replaceability due to dead space and limited volume change in the suck-back chamber.
Innovation Solution
A suck-back valve integrating an open/close valve with a suck-back function, utilizing a piston shaft and bellows to perform a two-step operation, increasing the suck-back chamber volume and eliminating dead space, allowing for a single actuator to manage both functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate open/close valve and suck-back valve are used, then leakage prevention function is achieved, but installation space increases and synchronization problems occur
Solution Approach 1:
The patent integrates the suck-back valve function into the open/close valve structure by providing a suck-back chamber within the valve body that communicates with the outlet channel. The valve piece simultaneously controls both the main fluid flow and the suck-back chamber, eliminating the need for a separate suck-back valve and reducing installation space while maintaining leakage prevention capability.
Solution Approach 2:
The valve piece is designed to perform multiple functions: it controls the opening and closing of the main fluid channel and simultaneously controls the suck-back chamber volume. By moving the valve piece, the system achieves both primary valve function and suck-back function through a single component, reducing overall system complexity.
2Reliability
If diaphragm-based suck-back valve is used, then suck-back function is achieved, but dead space increases and liquid replaceability decreases
Solution Approach 1:
The patent removes the diaphragm component from the suck-back chamber design. Instead of using a diaphragm to expand the suck-back chamber volume, the invention uses the movement of the valve piece itself to vary the chamber volume. This extraction of the diaphragm eliminates the dead space problem and improves liquid replaceability while maintaining the suck-back function.
Solution Approach 2:
The suck-back chamber volume is made dynamic through the movement of the valve piece. As the valve piece moves between open and closed positions, it dynamically changes the volume of the suck-back chamber, creating the necessary pressure differential for suck-back without requiring a diaphragm. This dynamic volume change eliminates dead space and improves fluid replaceability.
3Reliability
If large suck-back chamber volume is required, then suck-back capability improves, but chamber size increases and dead space increases
Solution Approach 1:
The invention creates a dynamically variable suck-back chamber volume through the movement of the valve piece. The chamber volume is not fixed but changes continuously as the valve piece moves, allowing the system to achieve large effective suck-back volume during operation while maintaining a compact physical chamber size. This dynamic approach eliminates the need for an enormously sized chamber.
Solution Approach 2:
The system changes the volume parameter of the suck-back chamber dynamically during operation. By utilizing the positional parameter of the valve piece to control chamber volume, the system achieves variable volume without requiring a physically large chamber structure, thereby improving suck-back capability without increasing dead space.
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 integration reduces installation space, improves synchronization, and enhances liquid replaceability by utilizing the entire suck-back chamber volume while preventing leakage.
Implementation Method 1
an elastic member that biases a valve piece in an opening/closing direction
Implementation Method 2
bellows that accommodate the piston shaft portion inside, separating the open/close operation portion from the valve internal channel
Implementation Method 3
carries out a valve piece opening/closing operation by receiving fluid pressure on an open/close operation portion that is provided with a piston main body
Implementation Method 4
a suck-back operation step in which the piston shaft portion and the open/close pressuring member further move from the fully closed position of the valve piece so as to increase the volume of the suck-back chamber
Data Source
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AI summary
A suck-back valve having an open/close valve with a suck-back function is provided. The suck-back valve includes a suck-back chamber formed in a valve internal channel of the open/close valve, a piston shaft portion that connects the piston main body and an open/close pressuring member that moves in the suck-back chamber in the axial direction to apply pressure to a valve piece, bellows that accommodate the piston shaft portion inside, separating an actuator from the valve internal channel, and that are connected to the open/close pressuring member at one end and are supported by a casing at the other end, wherein a two-step operation is carried out at the time of the closing operation of the valve piece, including a valve closing operation step in which the piston shaft portion, along with the piston main body and the open/close pressuring member, moves to the fully closed position of the valve piece, and a suck-back operation step in which the piston shaft portion and the open/close pressuring member further move from the fully closed position of the valve piece so as to increase the volume of the suck-back chamber.