Pressure Relief Valve Stroke Damping With Intermediate Friction
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Solution Overview
Problem
Valve arrangements, particularly pressure relief valves, experience rapid oscillation between open and closed positions, leading to damage due to valve chatter caused by excessive inlet pressure drop, backpressure, incorrect valve sizing, or turbulence, resulting in damage to the valve and upstream/downstream hydraulic components.
Innovation Solution
A valve arrangement with a movable valve component, a biasing member, and an intermediate component that generates frictional forces to control movement, reducing the range of axial movement and stabilizing the valve's position, thereby minimizing chatter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve component is allowed to move freely between open and closed positions, then the valve can respond to pressure changes, but valve chatter occurs causing damage and noise
Solution Approach 1:
The intermediate component is introduced between the valve component and the housing to act as a mediator. It has a friction surface that contacts the valve component during part of its stroke, providing controlled friction to dampen oscillations and prevent chatter, while allowing the valve to still respond to pressure changes.
Solution Approach 2:
The intermediate component is designed to be movable relative to the housing within a limited range, rather than being fixed. This dynamic arrangement allows it to engage with the valve component when needed to provide friction-based damping, while disengaging when the valve needs full movement range.
2Object-affected harmful factors
If friction is increased to reduce valve chatter, then vibration and noise are reduced, but the valve movement may be overly restricted
Solution Approach 1:
The intermediate component provides frictional opposition only during part of the valve's stroke (when the valve component contacts its friction surface), rather than throughout the entire movement. This partial action is sufficient to dampen chatter and reduce vibration without excessively restricting the valve's operational movement range.
3Stability of the object's composition
If the range of axial movement is reduced to minimize chatter, then valve stability improves, but the maximum valve lift is compromised
Solution Approach 1:
The valve stroke is effectively segmented into different zones: a initial movement phase where the intermediate component moves with the valve component without providing friction, and a subsequent phase where the intermediate component provides frictional damping. This segmentation allows full valve lift while achieving stability in the damped zone.
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
Reduces noise and vibration, increases wear resistance and durability, and improves performance by stabilizing the valve's movement, preventing damage and enhancing operational stability.
Implementation Method 1
a subsequent movement of the valve component, in the same direction as the initial axial movement, is opposed by an intermediate frictional force generated at least partly by the intermediate component
Data Source
AI summary
A valve arrangement for a fluid control system has a housing, comprising a fluid inlet, a fluid outlet, and extending along a central axis. The valve arrangement has a valve component, movable along the central axis between a first position, closing the fluid inlet, and a second position, a maximum valve lift defined therebetween. The valve arrangement has a biasing member, biasing the valve component towards the first position, and an intermediate component movable along the central axis, and relative to the valve component. The valve arrangement has a first stop and a second stop, the intermediate component axially movable therebetween, a range of the relative axial movement being less than the maximum valve lift. During an initial axial movement of the valve component from the first position, the intermediate component moves relative to the first stop and the second stop, and upon the intermediate component reaching the limit of the range of relative axial movement a subsequent movement of the valve component is opposed by an intermediate frictional force generated by the intermediate component.