Water temperature regulating valve
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Solution Overview
Problem
Existing water temperature regulating valves in hydronic heating systems face challenges in weight reduction, material flexibility, and manufacturing complexity due to the use of brass internals, which restricts design flexibility and increases manufacturing costs.
Innovation Solution
A water temperature regulating valve design featuring a shell-like insert with moulded thermoplastic elastomer (TPE) seal, allowing for reduced weight, increased flow capacity, and flexibility in inlet/outlet arrangements, using a simplified forged and machined valve body with a tapered static seal and offset central bore, along with a thermostatic element and piston mechanism for temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brass internals are used in the valve body, then structural strength and sealing reliability are improved, but weight and manufacturing cost increase
Solution Approach 1:
The valve is divided into two functional parts: a brass valve body providing structural strength and external threading, and a separate polypropylene insert containing the flow passages and internal sealing surfaces. This segmentation allows each material to optimize its properties without the penalty of combining them into a single heavy component.
Solution Approach 2:
The invention combines brass and polypropylene materials in a composite structure where the brass body provides mechanical strength and the polypropylene insert provides corrosion resistance and sealing functionality. The composite approach achieves the reliability of brass with the weight advantages of plastic.
2Ease of manufacture
If cast or machined channels are used within a brass valve body, then flow passages are formed, but manufacturing complexity and cost increase
Solution Approach 1:
The complex flow passage geometry is extracted from the brass valve body and relocated to a separate polypropylene insert. This extraction allows the insert to be manufactured using simple injection molding processes, avoiding the need for complex casting or machining operations on the brass body.
Solution Approach 2:
Traditional mechanical manufacturing methods (casting or machining) for creating flow passages are replaced with injection molding technology. The injection molded insert provides the same flow passage functionality with simpler, more cost-effective manufacturing processes.
3Reliability
If a tapered static seal is used between the insert and valve body, then sealing effectiveness is improved, but assembly complexity increases
Solution Approach 1:
A flexible O-ring seal is employed to create the sealing interface between the insert and valve body. The O-ring's elasticity allows it to conform to the tapered sealing surfaces, providing effective sealing while accommodating minor manufacturing tolerances and simplifying the assembly process.
Solution Approach 2:
The sealing mechanism utilizes the elastic properties of the O-ring material, which changes its physical parameters under compression. The O-ring deforms elastically to fill the sealing gap created by the tapered surfaces, providing a reliable seal without requiring precision-machined flat surfaces.
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 provides a lightweight, cost-effective, and flexible temperature control system with improved sealing and flow efficiency, capable of maintaining constant outlet temperatures despite varying supply pressures and temperatures, eliminating the need for additional pump protection and minimizing risk of water spillage and heat damage.
Implementation Method 1
said moveable closure means being temperature-reactive
Data Source
AI summary
A water temperature regulating valve (10) including a valve body (12) having a cavity (13) in which mixing of fluids can occur, and provided with a hot fluid (or heated water) inlet (18) adapted for communication with a source of hot (or heated) water, a cooled fluid inlet (16) adapted for communication with an apparatus that has used the mixed fluid for heating, a mixed fluid outlet (14) adapted for communication with an apparatus that uses the mixed fluid for heating, and a return fluid outlet (20) adapted for communication with the source of hot (or heated) water, all inlets and outlets also being in communication with the cavity (13) provided within the valve body (12), said cavity (13) being provided with an insert (24) in a sealing relationship with an inner surface of the said cavity (13), said insert (24) having a central bore (42) and also defining flow passages and being configured to direct the flows of hot fluid entering the cavity (13) via the hot fluid inlet (18) and cooled fluid entering the cavity via the cooled fluid inlet (16), the flow passages defined by the said insert (24) interacting with moveable closure means to selectively permit, restrict or prevent the flows of hot fluid and cooled fluid into the cavity (13), and mixed fluid and return fluid out of the cavity (13), said moveable closure means being temperature-reactive and/or manually operable.