High-Pressure Relief Valve Spool Design for Stable Pressure Control
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Solution Overview
Problem
Prior art High Pressure Relief Valves (HPRVs) exhibit unpredictable and unstable performance characteristics, such as sudden opening and droop, which are unsuitable for modern fuel control systems, leading to inconsistent pressure regulation and potential system instability.
Innovation Solution
The improved HPRV design incorporates a spool with a step feature and pass-through holes to ensure consistent pressure regulation, utilizing a force balance equation for calibration, and includes outlet windows that maintain flow direction and equalize pressure, thereby stabilizing the valve's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional HPRV design is used, then the valve can relieve excess pressure, but the valve exhibits unpredictable opening behavior and pressure droop
Solution Approach 1:
The patent introduces a dynamic force balance mechanism where the spool responds to real-time pressure differential changes. The spool position dynamically adjusts based on the balance between spring force and pressure differential force, enabling predictable opening behavior and eliminating sudden pressure droop by continuously adapting to system conditions
Solution Approach 2:
The patent implements a feedback mechanism through the force balance equation where the pressure differential across the spool feeds back to adjust spool position. This feedback loop ensures that the valve maintains stable operation by automatically compensating for pressure changes and preventing unpredictable opening/closing behavior
2Stress or pressure
If the HPRV opens to relieve pressure, then excess pressure is reduced, but system hysteresis increases and stability decreases
Solution Approach 1:
The patent applies preliminary action by pre-calibrating the spring force and designing the force balance equation to predict the exact pressure differential needed for valve opening. This allows the valve to open at the precise moment when pressure reaches the threshold, minimizing hysteresis and avoiding delayed pressure relief that would cause system instability
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 improved design achieves consistent and predictable pressure regulation, allowing the HPRV to operate effectively in variable displacement systems without additional bypass flow, reducing system hysteresis and maintaining stable pressure control across varying flow rates.
Implementation Method 1
a force balance equation between the spring force and the pressure differential force
Implementation Method 2
the pressure differential force is a function of the pressure differential across the spool
Data Source
AI summary
A high pressure relief valve comprising a sleeve defining an inlet to the valve, an outlet from the valve and an internal cavity. Further comprising a spool located within the internal cavity, wherein the internal cavity is defined in part by a spool contact surface of the internal cavity that is defined by an inner diameter, wherein the spool contact surface slides against an outer surface of the spool. A valve seat is located about the inlet, wherein the spool has a conical tip configured to contact the valve seat to seal the input to the sleeve. The conical tip ends at a step, wherein a fluid may be directed into the inlet over the conical tip and is turned by the step.