Check Valve Damper Chamber Layout for Chattering Suppression
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Solution Overview
Problem
Conventional check valves experience chattering due to insufficient damping force, which is limited by the small volume and diameter of the damper chamber, leading to ineffective attenuation of the valve element's axial moving force.
Innovation Solution
A check valve design with a damper chamber that communicates with the valve chest through a space between the valve element and a guide portion, where the spring is arranged in the valve chest, allowing for a large diameter and small volume damper chamber, maximizing damping force and reducing pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the spring is incorporated in the damper chamber to prevent increase in pressure loss, then the spring is arranged inside the damper chamber, but the volume of the damper chamber increases and the damping force decreases
Solution Approach 1:
The valve body is divided into separate functional chambers: the damper chamber for damping force generation and the spring chamber for spring accommodation. This segmentation allows each chamber to be optimized independently - the damper chamber can have large diameter for high damping force without being constrained by spring space requirements, while the spring chamber handles the spring separately.
Solution Approach 2:
The spring chamber is positioned axially adjacent to the damper chamber rather than radially integrated within it. This dimensional reorganization allows the spring to be arranged in the axial direction outside the damper chamber volume, enabling the damper chamber to achieve large diameter and high damping force without compromising pressure loss characteristics.
2Force
If the damper chamber volume is increased to increase damping force, then the damping force increases, but the pressure loss increases and the response becomes slower
Solution Approach 1:
The damper chamber is designed with locally optimized characteristics: large diameter for high damping force generation, but controlled volume through axial length limitation. The chamber cross-sectional area is specifically set to 90-100% of the valve element pressure receiving area to achieve optimal damping force while maintaining acceptable pressure loss and response characteristics.
3Force
If the cross-sectional area of the damper chamber is increased to increase damping force, then the damping force increases, but the diameter of the valve body increases and the overall size becomes larger
Solution Approach 1:
The spring chamber is relocated to the axial dimension rather than being integrated in the radial dimension. This allows the damper chamber to maintain large cross-sectional area for high damping force without increasing the overall radial diameter of the valve body, as the spring occupies axial space instead of radial space.
4Loss of energy
If the maximum compression ratio of the damper chamber volume is decreased to reduce pressure loss, then the pressure loss decreases, but the damping force decreases
Solution Approach 1:
The damper chamber is designed with locally optimized compression ratio characteristics. The cross-sectional area is specifically set to 90-100% of the valve element pressure receiving area, and the axial length is controlled to achieve maximum compression ratio of 2.0 or less. This local optimization provides sufficient damping force while maintaining acceptable pressure loss.
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 design effectively suppresses chattering by enhancing the damping force, reducing pressure loss, and improving the durability of the valve components by minimizing collisions and vibrations.
Implementation Method 1
a spring configured to push the valve element toward the seat portion
Implementation Method 2
a damper chamber communicating with the valve chest through a space between the valve element and the guide portion, the damper chamber being configured to attenuate axial moving force of the valve element
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
There is provided a check valve capable of effectively suppressing the generation of chattering. The check valve includes: a housing including an inlet channel, a valve chest, and an outlet channel; a seat member provided around the inlet channel, the seat member including a seat portion; a valve element pressed against the seat portion to close the inlet channel; a biasing member configured to push the valve element toward a valve seat; a guide portion provided at the housing and configured to guide the valve element when the valve element moves in an axial direction; and a damper chamber communicating with the valve chest through a space between the valve element and the guide portion, the damper chamber being configured to attenuate axial moving force of the valve element. The biasing member is arranged in the valve chest.