Eccentric Check Valve Layout for Low-Loss Backflow Prevention
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Solution Overview
Problem
Existing backflow preventer devices experience pressure loss and turbulence in fluid flow due to the alignment of valve members with the longitudinal axis, leading to inefficiencies and potential contamination during backflow situations.
Innovation Solution
The backflow prevention device features a main pipe body with offset inlet and outlet pipes and check valves, where the valve seat center is perpendicular to the pipe axes, reducing pressure loss and turbulence by positioning the valve member further away from the flow axis, allowing for smoother fluid flow and reduced redirection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the valve member is aligned with the longitudinal axis of the pipe body, then the structure is simple and manufacturing is easier, but pressure loss and turbulence increase during fluid flow
Solution Approach 1:
The patent applies asymmetry by offsetting the valve member from the longitudinal axis of the pipe body. The valve seat is positioned eccentrically within the pipe, creating an asymmetric flow path that reduces turbulence and pressure loss while maintaining effective backflow prevention. This asymmetric positioning allows fluid to flow more smoothly along the pipe wall rather than being forced through a centered valve opening.
2Ease of manufacture
If the valve member is aligned with the longitudinal axis, then manufacturing is simpler, but turbulence and debris accumulation increase
Solution Approach 1:
The eccentric positioning of the valve member creates an asymmetric configuration that promotes laminar flow along the pipe wall. This asymmetric arrangement prevents debris from accumulating at the bottom of the pipe and reduces turbulence by allowing fluid to follow a smoother path around the valve member rather than being forced through a centered opening.
3Productivity
If the valve seat center is offset perpendicular to the pipe axes, then pressure loss is reduced and flow efficiency is enhanced, but the structural complexity increases
Solution Approach 1:
The patent applies local quality by positioning the valve seat and valve member at a specific eccentric location within the pipe body, optimized for flow characteristics. The offset distance and angular position are carefully selected to maximize flow efficiency and minimize pressure loss while maintaining manufacturing feasibility. This localized optimization creates a balance between performance enhancement and structural complexity.
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
This design minimizes pressure loss and enhances flow efficiency by applying increased torque to the valve member, reducing turbulence and the likelihood of debris accumulation, while also simplifying manufacturing through hydroforming of the main pipe body.
Implementation Method 1
applying increased torque to the valve member
Data Source
AI summary
A backflow prevention device includes a main pipe body extending along a first center longitudinal axis, at least one check valve disposed within the main pipe body, an inlet pipe connected to an inlet side of the main pipe body, and an outlet pipe connected to an outlet side of the main pipe body. The inlet pipe and the outlet pipe extend along a second center longitudinal axis. The first center longitudinal axis is offset with respect to the second center longitudinal axis in a direction perpendicular to the first and second center longitudinal axes. A center of the valve seat of the at least one check valve is offset with respect to the second center longitudinal axis in the direction perpendicular to the first and second longitudinal axes.