Relief Valve Annular Channel Oscillation Control
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Solution Overview
Problem
Conventional relief valves experience oscillation phenomena due to rapid fluid flow into the valve chamber when the valve element moves away from the valve hole, leading to unstable operation and valve deterioration from repetitive contacts.
Innovation Solution
The relief valve incorporates an annular convex portion in the valve chamber and an annular concave portion on the valve element, with an annular channel extending along the center axis, regulating fluid flow and preventing excessive fluid entry, along with an adjusting mechanism to control the spring's urging force and an O-ring to restrict valve movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve element moves away from the valve hole to allow fluid passage, then the fluid pressure relief function is achieved, but a large amount of fluid rapidly flows into the valve chamber causing oscillation and unstable operation
Solution Approach 1:
The valve chamber is divided into a first chamber and a second chamber by a partition wall. The first chamber receives fluid from the valve hole, while the second chamber receives fluid from the inflow channel. This segmentation controls the fluid flow path to prevent rapid large-volume flow into a single chamber, thereby suppressing oscillation while maintaining relief functionality.
Solution Approach 2:
A communication hole is provided in the partition wall that allows controlled communication between the first chamber and the second chamber. This intermediary structure regulates fluid transfer between chambers, preventing sudden pressure changes and oscillation while ensuring proper pressure relief operation.
2Reliability
If the valve element moves away from the valve hole, then fluid can flow through the valve chamber, but the rapid fluid entry causes the valve element to repeatedly contact the valve hole leading to deterioration
Solution Approach 1:
By segmenting the valve chamber into two separate chambers with controlled communication, the invention prevents the rapid fluid influx that causes repetitive valve element contact and deterioration, while maintaining adequate fluid passage capability through the communication hole.
Solution Approach 2:
The partition wall and communication hole are pre-configured to control fluid flow paths before the valve operates. This preliminary structural arrangement ensures that when the valve opens, fluid flows in a controlled manner that prevents oscillation and repetitive contact, extending valve element life.
3Reliability
If fluid pressure rapidly drops on the inflow channel side when the valve opens, then fluid flows into the valve chamber, but this causes the valve element to move back and forth creating oscillation
Solution Approach 1:
The partition wall divides the pressure change effects into two separate chambers. When the valve opens, the first chamber experiences pressure changes from valve hole flow while the second chamber receives steady flow from the inflow channel. The communication hole allows pressure equalization, reducing overall pressure fluctuations and preventing oscillation.
Solution Approach 2:
The communication hole acts as an intermediary that mediates pressure changes between the two chambers. It allows controlled pressure equalization that prevents rapid pressure drops from causing valve element oscillation, while still allowing necessary fluid passage.
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 suppresses oscillation phenomena by maintaining consistent fluid flow rates and reducing valve element movement speed, ensuring stable operation and preventing valve deterioration.
Implementation Method 1
a spring that applies an urging force in a direction to bring the valve element into contact with the valve hole to the valve element
Implementation Method 2
when the fluid pressure on the inflow channel side (the primary side) reaches the given pressure or more, the fluid pressure of the fluid in the vicinity of the valve hole acts to apply a force overcoming the urging force from the spring to the valve element
Data Source
AI summary
In the relief valve, an annular convex portion 16a that is convexed in a direction in which a valve element 5a moves away from a valve hole 17 along a center axis of the valve hole 17 and that is arranged around the valve hole 17 is formed in a valve chamber 16, an annular concave portion 5d that is concaved in the direction in which the valve element 5a moves away from the valve hole 17 is formed in the valve element 5a, and in a shut-off state, the annular convex portion 16a is accommodated in the annular concave portion 5d, and an annular channel 19 that extends in a direction of the center axis is formed between an outer peripheral surface 16b of the annular convex portion 16a and an inner peripheral surface 5e of the annular concave portion 5d.