Variable Lay-Length Backflow Assembly for Retrofit Flexibility
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Solution Overview
Problem
Existing backflow prevention assemblies have fixed lay-lengths, requiring custom spools and extensive certification processes, making retrofitting and in-field adjustments difficult and costly, and they cannot accommodate thermal expansion or seismic movements without losing certification.
Innovation Solution
A backflow prevention assembly with a variable lay-length and orientation, using coupling assemblies and valve housings that can adjust longitudinally and rotate, allowing for easy installation and self-adjustment without additional parts, while maintaining certification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If fixed lay-length backflow prevention assemblies are used, then manufacturing precision and certification are maintained, but adaptability and ease of installation are reduced
Solution Approach 1:
The coupling assembly incorporates an adjustable mechanism that allows the lay-length to be dynamically changed in the field. The coupling connects to the inlet and outlet shutoff valves with adjustable spacing, enabling the assembly to adapt to different installation requirements while maintaining a certified design.
Solution Approach 2:
The backflow prevention assembly is divided into modular components including the coupling, inlet shutoff valve, outlet shutoff valve, and backflow prevention valve. This segmentation allows individual components to be adjusted or replaced independently, particularly the coupling which adjusts the lay-length between fixed components.
2Reliability
If custom spools are manufactured to match existing lay-lengths, then fit and certification are maintained, but loss of time and manufacturing cost increase
Solution Approach 1:
The coupling assembly allows field adjustment of lay-length without requiring custom-manufactured spools. Installers can adjust the coupling to match the existing assembly's lay-length on-site, eliminating the need for advance measurement, custom manufacturing, and waiting periods.
Solution Approach 2:
The adjustable coupling enables installers to self-determine and self-adjust the appropriate lay-length in the field based on the existing assembly, without requiring external custom manufacturing services or extensive planning.
3Stability of the object's composition
If fixed lay-length assemblies are used, then structural stability is maintained, but adaptability to thermal expansion and seismic movement is reduced
Solution Approach 1:
The coupling assembly provides a dynamic connection that can accommodate movements caused by thermal expansion and seismic activity. The adjustable mechanism allows the assembly to absorb these movements while maintaining proper function and connection integrity.
4Ease of operation
If in-field reconfiguration is performed, then adaptability and ease of operation improve, but certification validity deteriorates
Solution Approach 1:
The adjustable coupling is designed as part of the certified assembly, allowing field adjustment of lay-length while maintaining certification. The mechanism enables installers to reconfigure the assembly in the field to match different installation requirements without voiding the certification.
Data Source
AI summary
A backflow prevention assembly is configurable with varying lay-lengths and orientations. The assembly includes coupling assemblies and valve bodies that adjust in length and/or rotation to allow for the varying lay-lengths and orientations of the backflow prevention valves and assemblies with and without certification. A coupling assembly is connected to a backflow prevention valve and includes an outer sleeve and an inner sleeve that is slidingly received within the outer sleeve. The lay-length is adjusted by slidably moving the inner and outer sleeves with respect to one another.