Flushometer Offset Adapter Using Vertical Offset for Grab Bar Clearance
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Solution Overview
Problem
The installation of flushometers beneath grab bars in flush toilets poses compliance issues due to insufficient clearance between the grab bar and the flushometer, which is not compliant with ADA standards, necessitating modifications to the rough-in plumbing or flushometer piping.
Innovation Solution
An offset adapter is designed to connect the flushometer to existing rough-in plumbing, providing adequate clearance beneath an ADA-compliant grab bar by creating a vertical offset between the inlet and outlet portions, maintaining the flushometer's position while allowing for a lower connection point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the flushometer is installed at the standard rough-in height (11.5 inches above top of bowl), then the plumbing connection is straightforward, but the clearance beneath the grab bar is insufficient (0.65 inches) to meet ADA requirements
Solution Approach 1:
The adapter introduces a vertical dimension offset between the inlet and outlet ports, transforming a horizontal connection into a vertically offset connection. This allows the flushometer to be positioned lower while maintaining proper connection geometry, thereby increasing clearance beneath the grab bar to meet ADA requirements.
Solution Approach 2:
The adapter acts as an intermediary component between the rough-in plumbing and the flushometer inlet piping. It provides the necessary vertical offset and directional change, enabling compliance with ADA clearance requirements without modifying the existing rough-in plumbing or the flushometer itself.
2Ease of operation
If the outlet port is positioned lower to increase clearance, then ADA compliance is achieved, but the adapter length increases which may affect installation space
Solution Approach 1:
Rather than increasing adapter length in the horizontal direction, the design utilizes vertical dimensionality to achieve the required offset. The adapter body orientation and port positioning in three-dimensional space provide the necessary clearance without proportionally increasing overall adapter length, optimizing installation space constraints.
3Ease of operation
If the adapter creates a sharp turn or narrow passage to achieve offset, then clearance is improved, but pressure drop increases reducing flush efficiency
Solution Approach 1:
The adapter incorporates smooth curved transitions and radiused corners in the flow passages rather than sharp angles. This curvature reduces flow separation and turbulence, minimizing pressure drop while achieving the necessary vertical offset and directional change for ADA compliance.
Solution Approach 2:
The adapter design optimizes flow passage parameters including cross-sectional area, curvature radius, and passage length to minimize pressure drop. By carefully controlling these geometric parameters, the adapter achieves the required vertical offset while maintaining adequate flow efficiency and minimizing energy loss.
Data Source
AI summary
An offset adapter includes a body having front and rear walls, and a body channel. An inlet portion has first and second ends, and an inlet channel extending from the first end to the second end and in fluid communication with the body channel. An outlet portion has first and second ends, and an outlet channel extending from the first end to the second end and in fluid communication with the body channel. A first recess is formed in the front wall of the body proximate a top of the body and opposite the inlet channel, with a surface of the first recess being forward of the body channel. A second recess is formed in a top of the body forward of the second end of the inlet portion; and a third recess is formed in a bottom of the body rearward of the first end of the outlet portion.