Mechanical Standpipe Float Valve for Tank Overfill Prevention
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Solution Overview
Problem
Existing solutions for preventing overfilling of liquid holding tanks, especially those with inaccessible interiors, are either complex and expensive or unreliable due to the need for electrical components and periodic maintenance.
Innovation Solution
A purely mechanical overfill prevention valve system that includes a standpipe with a float and plug mechanism, allowing liquid to flow into the tank while preventing overfilling, which can be inserted through a small opening and does not require electrical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an electronic controlled valve with level sensors is used to prevent overfilling, then the tank can be filled automatically through a small port, but the system becomes complex and expensive
Solution Approach 1:
The patent replaces the electronic control system (electric valve and controller) with a purely mechanical float-valve mechanism. The float rises with the liquid level and directly actuates the valve plug to close the flow path when the predetermined level is reached, eliminating the need for sensors, controllers, and electric motors while achieving the same automatic overfill prevention function
Solution Approach 2:
The mechanical float-valve system is self-actuating and self-regulating. The float automatically responds to liquid level changes and directly controls the valve opening without requiring external power sources, control systems, or maintenance, making the system simpler and more reliable
2Ease of operation
If an electronic controlled valve with level sensors is used to prevent overfilling, then the tank can be filled automatically through a small port, but the system requires periodic maintenance and replacement
Solution Approach 1:
The patent replaces electronic components (valves, sensors, controllers) that require periodic maintenance with a simple mechanical float-valve system that has no moving parts other than the float and plug, eliminating the need for electrical connections, software updates, and complex troubleshooting
Solution Approach 2:
The mechanical float-valve mechanism is designed to be simple and potentially replaceable as a single unit. The entire overfill prevention device can be removed and replaced without specialized tools or knowledge of electronic systems, making maintenance easier and more reliable
3Reliability
If a float mechanism is inserted through a large opening to prevent overfilling, then overfill prevention is achieved, but the tank interior must be accessible
Solution Approach 1:
The patent nests the float and valve mechanism within the existing fill pipe structure. The float moves inside the fill pipe rather than requiring a separate large opening, allowing the overfill prevention device to be installed through the existing small fill port while still achieving reliable overfill protection
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 system provides a simple, reliable, and cost-effective means to prevent overfilling of liquid holding tanks, maintaining a constant liquid level and reducing maintenance needs, suitable for applications like liquid-fueled torches and multiple tanks from a common source.
Implementation Method 1
a float (200) that is lifted by the liquid as the tank is filled
Data Source
AI summary
An overfill prevention valve cooperative with a standpipe includes a plug, float, and seat that do not exceed the standpipe in diameter. The valve and standpipe can be inserted into a liquid holding tank from below. Rising liquid lifts the float and plug until the plug is sealed against the seat. The float can be above the seat and connected to the plug by a rod penetrating centrally through the seat. A check valve can enable draining of the holding tank when the liquid is withdrawn from the standpipe. The holding tank can be a fuel tank of a liquid fuel burning torch. A central reservoir system can automatically fill a plurality of holding tanks having the disclosed valves installed therein and connected in series by a plumbing system. Filling can be automatically terminated when a backpressure within the plumbing system exceeds a specified threshold.