Thermal Backflow Valve for Hot Water Recirculation Control
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Solution Overview
Problem
Pressure differentials between hot and cold water lines in residential or commercial water distribution systems can cause backflow of cold water into the hot water line, leading to inefficiencies and potential leaks.
Innovation Solution
A temperature control valve apparatus with a housing, valve seat, and removable valve plug, biased by a spring, and operated by a thermal actuator and temperature sensor to prevent backflow by sealing the valve at a preselected temperature, ensuring water flows only from the hot to the cold line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a cross-connection is utilized with a pump to provide ready hot water at fixtures, then hot water availability is improved, but pressure differential causes cold water to bleed into the hot water line
Solution Approach 1:
A thermal actuator is introduced as an intermediary device between the pump and the valve plug. The thermal actuator responds to temperature changes and physically moves the valve plug to seal the connection when cold water intrusion is detected, thereby mediating the conflict between maintaining hot water flow and preventing cold water backflow
Solution Approach 2:
The system uses the temperature of the water itself as the control signal. The thermal actuator is heated by the hot water and automatically actuates to close the valve when the temperature indicates cold water intrusion, eliminating the need for external sensors or complex control systems
2Productivity
If a valve plug is biased in a spaced apart relationship to enable water flow, then water flow capability is improved, but the valve must be sealed to prevent backflow
Solution Approach 1:
The valve plug transitions from a static position to a dynamic one, moving between an open position (spaced apart from the seat) that allows water flow and a closed position (seated against the seat) that prevents backflow. The thermal actuator provides the dynamic control mechanism for this position change
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
Effectively prevents backflow from the cold to the hot water line, maintaining temperature control and reducing pressure-related issues in water distribution systems, suitable for residential and commercial applications.
Implementation Method 1
A thermal actuator is disposed in an operative position for moving the valve plug to a sealing position against the valve seat to prevent water flow therepast from cold line to the hot water line with the actuator being operative at a preselected water temperature
Implementation Method 2
A valve spring is provided which biases the valve plug in a spaced apart relationship with the valve seat for enabling water to flow therepast and through the housing from the hot water line to the cold water line
Data Source
AI summary
Temperature control valve apparatus for preventing back flow from a cold water line into a hot water line includes a housing having an inlet or connection to a hot water line, an outlet for a connection to a cold water line and an interconnecting bore with a valve seat. A removable valve plug is disposed in the bore proximate the valve seat and a valve spring biases the valve plug in a spaced apart relationship with the valve seat for enabling water to flow therepast and through the housing from the hot water line to the cold water line. A thermal actuator disposed in an operative position for moving the valve plug to a seating position against the valve plug is provided to prevent water flow therepast from the cold water line to the hot water line.