External Liquid Level Sensing for Responsive Pipeline Air Valves
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Solution Overview
Problem
Existing air valves in pipelines, such as those in potable water and wastewater treatment systems, face challenges in effectively managing air build-up and vacuum conditions due to internal components that may not accurately respond to liquid levels, leading to inefficiencies in air management.
Innovation Solution
An air valve assembly with an external non-contact liquid level sensor that communicates with an actuator to control the air valve's operation, allowing for precise management of air introduction and expulsion without direct contact with the liquid, using sensors like capacitance, optical, or diaphragm level sensors to detect liquid levels and send signals to the actuator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If internal liquid level sensors are used in air valves, then the valve can detect liquid levels, but the internal components may not accurately respond to liquid levels leading to inefficiencies
Solution Approach 1:
The liquid level sensor is extracted from the internal components of the air valve and positioned externally. This external positioning allows the sensor to accurately detect liquid levels without interference from internal valve components, while the sensor signal is transmitted to control the valve operation, resolving the issue of inaccurate detection by internal sensors.
Solution Approach 2:
An external housing and signal transmission mechanism serve as intermediaries between the liquid level sensor and the air valve actuator. The sensor detects liquid levels externally, and this information is transmitted through the intermediary system to control the valve, enabling accurate liquid level detection without requiring internal sensor placement that causes reliability issues.
2Measurement precision
If non-contact liquid level sensors are used externally, then accurate liquid level detection is achieved without direct contact with liquid, but the device complexity increases
Solution Approach 1:
The air valve assembly is segmented into distinct functional components: the main air valve body, a separate external housing containing the liquid level sensor, and the actuator system. This segmentation allows the sensor to be positioned externally for accurate detection while maintaining modular construction that manages complexity through organized functional separation.
3Device complexity
If internal components are used to detect liquid levels, then the valve structure remains simple, but the response to liquid levels may be inaccurate
Solution Approach 1:
The liquid level detection function is extracted from the internal valve structure and placed in an external housing. This extraction maintains the simplicity of the core valve mechanism while achieving accurate liquid level detection externally, resolving the contradiction between structural simplicity and detection accuracy.
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
This solution enables more accurate and responsive air management in pipelines, preventing unwanted air build-up and vacuum conditions by allowing for controlled operation of the air valve based on external liquid level detection, enhancing the reliability and efficiency of air valve performance.
Implementation Method 1
using sensors like capacitance, optical, or diaphragm level sensors to detect liquid levels
Implementation Method 2
using sensors like capacitance, optical, or diaphragm level sensors to detect liquid levels
Data Source
AI summary
An air valve assembly (10) includes a main housing (12) including a coupling flange (14) for coupling to a pipe, and an air valve (20) fluidly coupled to the main housing (12). An actuator (28) is in fluid communication with the air valve (20) and a discharge tube (40). A non-contact liquid level sensor (30) is located in an external housing coupled to the main housing (12). The non-contact liquid level sensor (30) is in operative communication with the actuator (28).