Dual-Valve Check Valve Structure for Pressurized Fluid Leak Blocking
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Solution Overview
Problem
Conventional check valve devices with multiple valves in series are prone to fluid leakage due to the high likelihood of one valve failing to close, especially when foreign matter is present.
Innovation Solution
A check valve device is designed with a main valve and a sub-valve in series along a flowpath, ensuring that even if one valve fails to close, the other valve can still block the flowpath, preventing fluid leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple valves are arranged in series in a flowpath, then the valve device can control flow in multiple directions, but the probability of fluid leakage increases because at least one valve may fail to close
Solution Approach 1:
The flowpath is segmented into multiple branches, each with its own valve. The flowpath includes a first branched path with a first valve and a second branched path with a second valve, allowing independent control of different flow paths while maintaining system reliability
Solution Approach 2:
A communication path is introduced as an intermediary between the first and second branched paths. This communication path allows pressure equalization and enables one valve to assist the other in preventing leakage, so that if one valve fails to close completely, the other valve can compensate
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 configuration effectively prevents pressurized fluid from leaking out of the flowpath, even if one of the valves cannot be closed, thereby enhancing the reliability of the check valve device.
Implementation Method 1
A valve closing spring (47) is mounted between the main valve member (41) and the block (1), and the valve closing spring (47) urges the main valve member (41) toward the main valve seat (46)
Implementation Method 2
An advance spring mounted in an actuation chamber below the piston moves the piston upward
Implementation Method 3
when pressurized fluid is supplied to the actuation chamber above the piston, the piston is retracted downward
Data Source
AI summary
Provided is a check valve device having a structure with which pressurized fluid is less likely to leak from a flowpath blocked by a valve. A flowpath is formed in a block, and a main valve and a sub-valve are provided in series along the flowpath. A primary-side chamber, an intermediate chamber, and a secondary-side chamber, which form a section of the flowpath, are formed in that order from the one end of the flowpath to the other end thereof. The main valve and the sub-valve are opened by a pilot valve.