Self-Contained Thermal Mixing Valve Assembly
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Solution Overview
Problem
Existing mixing valves require partial assembly within a manifold or housing, making them difficult to install and replace as fully assembled and calibrated units.
Innovation Solution
A self-contained mixing valve design featuring a thermally responsive wax actuator, a slide, a return spring, and a relief spring, allowing for pre-assembly and testing outside the manifold, with the cap threaded into a bore to secure the unit, enabling easy installation and protection against over-temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the mixing valve is designed to interface with adjacent structures in a manifold or housing, then the valve can be integrated into the system, but the valve requires partial assembly within the manifold or housing, making installation and replacement difficult
Solution Approach 1:
The mixing valve is designed as a self-contained modular unit with distinct functional components (actuator, valve body, valve member, springs) that are pre-assembled together as a complete assembly. This segmentation allows the entire valve to be installed as one unit into the manifold or housing, eliminating the need for partial assembly within the confined space of the manifold and significantly simplifying installation and replacement procedures
Solution Approach 2:
The mixing valve components are pre-assembled and pre-calibrated outside the manifold or housing before final installation. The actuator, valve body, and valve member are configured together in advance, allowing the complete assembly to be tested and adjusted prior to installation, thereby eliminating complex on-site assembly operations and reducing installation time
2Ease of operation
If the mixing valve is designed as a self-contained unit, then installation is simplified, but additional space is required for the integrated components
Solution Approach 1:
The actuator is positioned within the valve body such that the valve member extends through the actuator, creating a nested arrangement where components occupy overlapping spatial volumes. The actuator chamber is integrated within the valve body cavity, allowing the self-contained assembly to achieve compact dimensions while maintaining all necessary functional components for independent operation
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
Enables efficient and safe installation of a fully calibrated mixing valve as a single unit, ensuring precise temperature control and preventing damage from extreme temperatures through the built-in relief mechanism.
Implementation Method 1
the actuator is of the wax filled type and includes a thermally responsive wax that generates a variable, temperature dependent force
Implementation Method 2
A return spring generates a force sufficient to move the actuator and slide to a pre-actuated or cold position as temperature in the mixing chamber falls
Implementation Method 3
A relief spring allows for additional extension of the actuator in extreme over-temperature conditions, preventing damage to the mixing valve in extreme circumstances
Data Source
AI summary
A self-contained thermal mixing valve includes a cap defining a bore, a relief spring and abutment plate within the bore, and a temperature responsive actuator arranged to generate an actuation force against said abutment plate when exposed to a predetermined increase in temperature. A slide is secured to the actuator and moves with the actuator in response to temperature changes. The slide defines a mixing chamber surrounding the temperature sensitive part of the actuator and includes a fluid flow slot axially aligned with the temperature sensitive part of the actuator. The slide is configured to move along a bore which includes axially offset fluid flow inlets, causing the fluid flow slot to vary fluid flow from the fluid flow inlets into the mixing chamber to produce a mixed outflow within a predetermined temperature range. The relief spring provides mechanical relief to the actuator in over-temperature situations.