Magnetic Vacuum Valve for Cargo Tank Pressure Equalization
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Solution Overview
Problem
Existing vacuum valves for cargo tanks on oil tankers fail to maintain pressure differences within new, stricter regulations, requiring larger diameters that violate international standards, and lack efficient pressure equalization mechanisms.
Innovation Solution
A vacuum valve design incorporating a weight outside the housing and strategically placed magnets to control the opening and closing points, ensuring the pressure difference never exceeds 10% above the predetermined opening point, with a smooth flow curve and compliance with international regulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the diameter of the valve housing is made very large (at least 10 to 12 inches), then the pressure difference can be controlled within 10% above the opening point, but this violates international regulations for vacuum valve dimensions
Solution Approach 1:
The patent changes the physical parameters of the valve system by introducing a weight and magnetic field interaction. The weight creates a closing force that modifies the pressure-difference vs. valve-opening relationship, allowing the valve to maintain pressure control within 10% of the opening point using a standard-sized housing rather than an oversized one.
Solution Approach 2:
The patent employs a weight that acts as a counterbalancing force against the pressure differential. This weight provides a closing force on the valve body that counteracts the tendency of the valve to remain open, enabling precise control of the pressure difference without requiring an enlarged valve housing.
2Reliability
If traditional vacuum valve designs are used, then the valve opens at the predetermined pressure difference, but the pressure difference can exceed the opening point by more than 10% before the valve responds
Solution Approach 1:
The patent implements a feedback mechanism where the weight and magnetic field continuously interact with the valve body position. As the valve opens and pressure equalizes, the changing pressure differential modifies the magnetic force and weight effect, providing automatic feedback control that prevents excessive pressure buildup and ensures rapid response within 10% of the opening point.
Solution Approach 2:
The patent introduces dynamic control elements (weight and magnetic field) that adapt to the valve's position and pressure conditions. The magnetic force varies with the gap between magnets, and the weight provides continuous closing force, creating a dynamic system that actively maintains pressure control rather than relying on static spring forces alone.
3Reliability
If a weight is added outside the valve housing and magnets are strategically placed, then precise pressure difference control within 10% is achieved with standard valve dimensions, but the device complexity increases
Solution Approach 1:
The patent employs self-regulating mechanisms where the weight and magnetic field automatically adjust to pressure conditions without external control systems. The weight provides continuous closing force, and the magnetic field varies naturally with valve position, creating a self-service control system that reduces the need for complex external actuators or control electronics.
Solution Approach 2:
The patent replaces traditional mechanical spring-based closing mechanisms with a combination of gravitational force (weight) and magnetic field interaction. This substitution eliminates the need for complex spring assemblies and mechanical linkages, achieving precise control with a simpler overall mechanical structure despite adding the weight component.
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 valve achieves efficient and compliant pressure equalization, maintaining pressure differences within regulatory limits, allowing for quick opening and slow closing, while being compatible with existing systems and cost-effective to produce.
Implementation Method 1
a weight arranged outside of the valve housing in such a way that in the open position of the valve body the force of gravity on the weight seeks to move the valve body towards the closed position
Implementation Method 2
a first magnet provided on the valve body and a second magnet or a material attracted to magnets provided in the valve housing, or a first magnet is provided in the valve housing and a second magnet or a material attracted to magnets provided on the valve body, in such a way that the magnetic force seeks to hold the valve body against the valve seat
Data Source
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AI summary
A vacuum valve (1) for cargo tanks in, for instance, oil tankers, the vacuum valve comprising a valve housing (2) with a valve body (4) and a thereto associated valve seat (3), the valve body (4) being axially movable relative to the valve seat (3) between an open position and a closed position, where the position of the valve body (4) relative to the valve seat (3) is dependent on the difference between the pressure in the cargo tank and the ambient pressure exterior (23) to the vacuum valve (1). The vacuum valve (1) further comprises a weight (6) arranged outside of the valve housing (2) in such a way that in the open position of the valve body (4) the force of gravity on the weight (6) seeks to move the valve body (4) towards the closed position, and a first magnet (7) provided on the valve body (4) and a second magnet (8) provided in the valve housing (2) in such a way that the magnetic force seeks to hold the valve body (4) against the valve seat (3).