Transparent Backflow Preventer for Visual Valve Inspection
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Solution Overview
Problem
Existing backflow preventers lack reliability and ease of testing and repair, as they do not allow for visual observation of check valve positions and require complex procedures for maintenance.
Innovation Solution
The design includes a translucent or near-transparent body with check valves that can be visually inspected externally, and a plug system that facilitates easy removal and replacement of components, along with pressure relief and indicating ports for testing the device's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the backflow preventer body is made opaque for durability and cost-effectiveness, then manufacturing cost is reduced and structural strength is maintained, but visual observation of check valve positions becomes impossible
Solution Approach 1:
The body material is selected to be translucent or transparent, enabling visual observation of check valve positions and operation without adding mechanical components. This optical property change allows the body to simultaneously maintain structural integrity while providing visibility functionality.
2Ease of repair
If the backflow preventer uses a sealed, integrated design for reliability, then contamination risk is reduced, but access for testing and repair becomes difficult
Solution Approach 1:
The check valves and other internal components are designed to be removable from the body through the inlet or outlet ports. This extraction capability allows maintenance personnel to access, test, and replace components without compromising the sealed design during normal operation.
Solution Approach 2:
The backflow preventer is designed as an assembly of separable components (body, check valves, seats, springs) that can be individually accessed and removed. This segmentation enables easy maintenance while maintaining overall system integrity during operation.
3Productivity
If the backflow preventer requires disassembly for testing and maintenance, then sealing integrity is maintained, but maintenance time and complexity increase
Solution Approach 1:
Components are designed to be extractable through existing ports without full disassembly. This allows rapid testing and replacement of check valves and seats by simply removing them through the inlet or outlet ports, significantly reducing maintenance time.
Solution Approach 2:
The design enables field personnel to perform testing and basic maintenance operations without requiring specialized tools or extensive disassembly procedures. Components can be manually removed and inspected through the ports.
4Difficulty of detecting and measuring
If the backflow preventer uses a simple, opaque body design, then manufacturing cost is reduced, but visual verification of operation and detection of issues becomes impossible
Solution Approach 1:
The body material is specified as translucent or transparent, providing inherent visual indication capability. This allows operators to observe check valve positions, flow direction, and potential issues without adding external indicators or sensors.
Solution Approach 2:
The translucent body acts as an intermediary that transmits light to enable visual observation of internal components. This eliminates the need for additional indicator mechanisms while providing continuous visual feedback on system status.
Data Source
AI summary
A backflow preventer (10, 128) includes a body (12, 130). The body includes an inlet port (14, 132) and an outlet port (16, 134). A central cylindrical bore (26, 144) extends in the body and axially between the inlet port and the outlet port. A first check valve (40, 152) and a second check valve (42, 156) are removably mounted in the bore through an insertion opening (38, 150). A removable plug (94, 95, 158) is positionable in the insertion opening to hold the check valves within the bore. Some exemplary arrangements include a translucent body to facilitate visual observation of proper check valve operation and testing of the backflow preventer.