Filling device for a pressurised heating circuit
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Solution Overview
Problem
Conventional filling devices for pressurized heating systems are complex, costly, and prone to misuse by inexperienced users, leading to over-pressurization and premature boiler failure due to lack of a fail-safe mechanism to prevent accidental water circulation.
Innovation Solution
A filling device with a dead-man valve biased to a normally closed condition, requiring manual operation to open and ensuring closure when unattended, combined with a check valve to prevent backflow, and an optional pressure regulator for safe pressure delivery, allowing for simplified and safe filling operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional filling device with isolation valves and hose is used, then the heating circuit can be filled with water, but the device is complex and prone to misuse by inexperienced users leading to over-pressurization and boiler failure
Solution Approach 1:
The invention extracts the critical safety function (automatic closure) from the complex multi-valve system and implements it through a single integrated filling device with spring-biased closure mechanism. This simplifies the overall system while maintaining reliability by removing the need for multiple isolation valves and hoses that prone to misuse.
Solution Approach 2:
The filling device incorporates a spring-biased closure mechanism that automatically closes the water supply when the filling operation is complete or when pressure is reached. This self-closing feature eliminates the need for user intervention to close valves, preventing over-pressurization even when operated by inexperienced users.
2Ease of operation
If isolation valves are used in the filling device, then water flow can be controlled, but the device requires manual operation and user attention to prevent accidental water circulation
Solution Approach 1:
Instead of using a valve that opens by default and requires closing ( conventional approach), the invention inverts the logic by using a valve that closes by default and opens only when actively operated. This inversion makes the system inherently safer as the default state prevents water circulation, and the valve remains open only when the user intentionally keeps it open during filling.
3Ease of manufacture
If a simple filling hose connection is used, then installation is quick and easy, but the hose is often lost and must be refitted for subsequent charging
Solution Approach 1:
The invention merges the filling connection, pressure regulation, and automatic closure functions into a single integrated device that can be permanently installed. This eliminates the need for separate hoses that get lost and ensures consistent performance by combining multiple critical functions in one reliable unit.
4Productivity
If the filling device allows continuous water flow, then filling is fast, but inexperienced users may over-pressurize the system
Solution Approach 1:
The spring-biased closure mechanism creates periodic action by automatically closing the valve when filling is complete or pressure is reached, then allowing it to open again for subsequent filling operations. This periodic opening and closing ensures fast filling when needed while preventing continuous flow that would cause over-pressurization.
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 significantly reduces the risk of over-pressurization and premature boiler failure by ensuring the filling device cannot be left open, facilitating safe and reliable operation by non-technical users, while ensuring consistent pressure delivery.
Implementation Method 1
a dead-man valve interposed in the passage between the inlet port and the outlet port, said dead-man valve biased to a normally closed condition to shut off fluid flow through the channel in either direction when unattended
Implementation Method 2
A check valve is provided, preferably in one or more of the isolation valves, to prevent leakage of water back out of the pressurised circuit
Data Source
AI summary
A filling loop device for a pressurized heating system comprising means defining a fluid passage having, an inlet port connectable to a fluid supply and an outlet port connectable to a heating system fluid circuit; and a dead man valve interposed in the passage between the inlet port and the outlet port, said dead man valve biased to a normally closed condition to shut off fluid flow through the channel in either direction when unattended, and manually operable to an open condition to permit fluid to flow from the inlet port to the outlet port. Also provided is a method of charging a pressurized boiler and heating circuit.