Relief Valve Passage Layout for Lower Hydraulic Discharge Noise
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Relief valves in valve devices generate noise when relieving working fluid due to high flow velocity, particularly in systems with large relief flowrates and complex passage configurations.
Innovation Solution
Incorporating a sub relief passage that branches from the main relief passage and connects to the tank passage separately, reducing the flow velocity and noise by distributing the relieved fluid through multiple discharge systems and reducing the need for additional passages directly connecting the relief valve to the tank.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a single main relief passage is used to connect the relief valve to the tank passage, then the device complexity is reduced, but the flow velocity of the working fluid remains high causing noise generation
Solution Approach 1:
The single relief passage is segmented into a main relief passage and a sub relief passage that branches off from it. This segmentation divides the fluid flow path into multiple channels, reducing the flow velocity in each passage and thereby minimizing noise generation while maintaining a relatively simple overall structure
2Object-affected harmful factors
If the channel area of the relief passage is increased to reduce flow velocity and noise, then the noise is reduced, but the size of the inlet block increases
Solution Approach 1:
Instead of increasing the cross-sectional area of a single passage, the passage is segmented into multiple smaller passages (main and sub relief passages). This allows the total flow capacity to be maintained or increased while keeping each individual passage compact, thus reducing noise without significantly increasing the inlet block size
3Object-affected harmful factors
If multiple relief passages are added to reduce flow velocity and noise, then the noise is reduced, but the manufacturing complexity increases
Solution Approach 1:
The relief passage is segmented into a main passage and a sub passage that branches from it, creating multiple flow paths with minimal additional complexity. This segmentation can be achieved through straightforward machining operations such as drilling and tapping, avoiding the need for complex multi-axis machining or specialized manufacturing processes
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 solution effectively reduces noise and prevents its occurrence by increasing the total sectional area for fluid flow, allowing for a larger channel area without increasing the size of the inlet block, and simplifies manufacturing by forming the sub relief passage with fewer machining complexities.
Implementation Method 1
a sub relief passage branching from the main relief passage and connected to the tank passage separately from the main relief passage
Data Source
AI summary
A valve device includes a relief valve configured to be opened when a pressure in a fluid pressure circuit reaches a predetermined pressure and to relieve a working fluid, a tank passage connected to a tank, a main relief passage connecting the relief valve and the tank passage, and a sub relief passage branching from the main relief passage and connected to the tank passage separately from the main relief passage.