Flow Control Arrangement Backflow Prevention and Leak Detection
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Solution Overview
Problem
Existing flow control systems in industries such as semiconductor and bioprocesses face challenges in detecting and preventing backflow and leakage, which can lead to contamination, equipment damage, and productivity losses due to the difficulty in detecting small, internal leaks in valves, especially as they age and wear out.
Innovation Solution
A backflow prevention device and leak detection system utilizing a continuous flow of inert sweep gas to sweep away any liquid leakage, with a control system that manages valve states to prevent backflow and a flow switch to detect leaks at very low flow rates, ensuring that any leaked liquid is diverted away from the main flow and detected promptly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional visual inspection methods are used to detect leaks, then the system structure remains simple, but the detection precision is insufficient and small leaks are easily overlooked
Solution Approach 1:
The patent introduces an intermediary fluid (gas or liquid) that flows through the system and allows detection of leaks through monitoring changes in flow rate or pressure. This intermediary substance enables indirect detection of leaks that are otherwise invisible and undetectable by direct visual inspection, thereby improving detection precision without requiring complex direct observation systems.
Solution Approach 2:
The patent replaces traditional visual inspection methods with instrumental detection systems that monitor flow rate and pressure changes. This substitution uses mechanical and physical measurements rather than human visual inspection, significantly improving the ability to detect small leaks while providing objective, quantifiable data.
2Reliability
If check valves are used to prevent backflow, then backflow prevention is provided, but internal leaks increase over time as valves age and wear
Solution Approach 1:
The patent implements a feedback system that continuously monitors flow rate and pressure in real-time. When a leak is detected through changes in these parameters, the system provides feedback signals that can trigger alarms or automatic responses. This continuous feedback mechanism allows for early detection of valve wear and internal leaks, enabling timely intervention before significant chemical loss occurs.
Solution Approach 2:
The patent employs preliminary detection measures by continuously monitoring system parameters before significant leaks occur. The flow rate and pressure sensors detect early signs of valve degradation and internal leakage, allowing the system to take preliminary actions such as triggering warnings or adjusting operations before substantial chemical loss or contamination occurs.
3Adaptability or versatility
If interconnected liquid delivery systems are used for process convenience, then operational flexibility is improved, but the risk of cross contamination increases
Solution Approach 1:
The patent uses an intermediary fluid (gas or liquid) that flows through the interconnected systems to detect and prevent cross-contamination. This intermediary substance allows monitoring of flow patterns and pressure changes that indicate potential contamination events, enabling early detection while maintaining the operational flexibility of interconnected systems.
Solution Approach 2:
The patent replaces manual monitoring and visual inspection with automated instrumental detection systems that continuously monitor flow rate and pressure. This mechanical substitution provides objective, real-time detection of contamination risks in interconnected systems, enabling rapid response while maintaining system interconnection for operational flexibility.
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 effectively prevents expensive damage from backflow and leakage, saving valuable chemicals and maintaining high-purity processes by detecting leaks at ultra-low flow rates and preventing contamination, thereby reducing downtime and maintaining productivity.
Implementation Method 1
a continuous flow of sweep gas to sweep away any liquid leakage
Implementation Method 2
a flow switch to detect leaks at very low flow rates
Data Source
AI summary
An apparatus for preventing backflow and contamination, and detecting by-pass leaks in a flow control arrangement is disclosed. The apparatus includes a vent line connecting a sweep gas source and a vent. Constant process-inert gas flows from the source through the vent line into the vent. The vent line is connected with the flow control arrangement. Any leakage in the flow control arrangement is channeled to the vent line and swept into the vent along with the sweep gas. As a result, pressure in the flow control arrangement cannot build up and leakage backflow is prevented. A flow switch may be disposed on the vent line for detecting leakage. The sweep gas flow rate is controlled at a constant level that is inadequate to actuate the flow switch and keeps the flow switch ready to actuate by any superimposed leakage. The flow switch detects a leakage when it actuates.