Pressure Relief Valve Flow Constriction for Stable Excess Pressure
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Solution Overview
Problem
Existing pressure relief valves experience large pressure fluctuations, leading to wasteful and unnecessary escape of gases, as they cannot maintain a relatively constant excess pressure, particularly in large capacity applications, due to a significant difference between opening and closing pressures.
Innovation Solution
A pressure relief valve with a cylindrical pipe section featuring a flow constriction, which increases the radial passage between the lifting element and the flow constriction as the valve opens, allowing for smooth closure near the opening pressure, reducing production costs and preventing abrupt valve closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the valve capacity is increased to handle large volume loading, then the productivity improves, but the pressure fluctuations become larger and gas escape increases
Solution Approach 1:
The patent changes the geometric parameters of the flow passage, specifically introducing a flow constriction with a minimized cross-sectional area. This parameter change creates a venturi effect that stabilizes pressure and reduces gas escape while maintaining high valve capacity for large volume loading applications
2Reliability
If the difference between opening and closing pressure is increased to ensure reliable valve operation, then the reliability improves, but the pressure fluctuations increase and operational efficiency decreases
Solution Approach 1:
The flow constriction creates a pressure feedback mechanism where the venturi effect generates a pressure drop that automatically modulates valve opening. This feedback loop allows the valve to operate reliably while minimizing pressure fluctuations and maintaining efficient operation near the opening pressure
3Ease of manufacture
If a simple cylindrical pipe section is used for the valve housing, then the ease of manufacture improves, but the valve cannot maintain constant excess pressure
Solution Approach 1:
The patent applies local quality by introducing a flow constriction with minimized cross-sectional area at a specific location within the otherwise simple cylindrical pipe section. This localized geometric feature creates the venturi effect that stabilizes pressure without requiring complex overall valve housing design, maintaining ease of manufacture while achieving pressure constancy
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 maintains a relatively constant excess pressure, reducing gas escape and ensuring smooth valve actuation, thereby minimizing pressure fluctuations and enhancing operational efficiency.
Implementation Method 1
a flow constriction defining an essentially truncated conically shaped interior of the flow constriction. The flow constriction is configured and arranged to encircle the lifting element when the pressure relief valve is closed such that a radial passage, or clearance, between the lifting element and the flow constriction increase when the lifting element and the valve body is moved from a closed state of the pressure relief valve towards an open state of the pressure relief valve
Data Source
AI summary
A pressure relief valve for pressure equalization between an essentially closed space and the surrounding atmosphere is disclosed. The pressure relief valve includes a valve housing with:a cylindrical wall defining a flow passage,a valve body arranged to cooperate with a valve seat arranged in the outflow of the valve housing,a stem configured for axial guidance of the valve body,a lifting element or plate arranged further down in the flow passage relative to the valve seat,a flow constriction defining an essentially truncated conically shaped interior and arranged to encircle the lifting element such that a radial passage between the lifting element and flow constriction increase when the lifting element and the valve body is moved from a closed state of the pressure relief valve towards an open state of the pressure relief valve.