Pressure Limiting Valve for Backflow Preventer Testing
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Solution Overview
Problem
Current technologies lack a reliable method to attach a low pressure gauge to high pressure systems without damaging the gauge, and existing gauges are not designed to accurately measure small pressure increments in static environments, leading to inaccurate and inconsistent testing results for backflow prevention devices.
Innovation Solution
A pressure limiting valve with a flexible rubber diaphragm and opposing springs that separates upper and lower chambers, allowing the valve to bias a closure disc to an open position when not under pressure and compressing to seal the outlet when pressure reaches the maximum rating of the low pressure gauge, protecting the gauge from over-pressurization and enabling accurate measurement of small pressure increments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a low pressure gauge is attached directly to a high pressure system, then the gauge can measure pressure in the system, but the gauge will be damaged by over-pressurization
Solution Approach 1:
A pressure limiting valve is introduced as an intermediary device between the high pressure system and the low pressure gauge. The valve allows the gauge to indirectly measure pressure through its outlet while limiting the maximum pressure that reaches the gauge to its rated capacity, thus protecting the gauge from damage while enabling measurement functionality
Solution Approach 2:
The pressure limiting valve changes the pressure parameter from the high pressure system level to a lower, gauge-safe level at the gauge outlet. The valve maintains a functional relationship between inlet and outlet pressures while ensuring the outlet pressure never exceeds the gauge's maximum rating, allowing the gauge to operate within its safe parameter range
2Reliability
If a low pressure gauge is used in a high pressure system, then the gauge can be protected from damage, but the gauge cannot accurately measure small pressure increments
Solution Approach 1:
The pressure limiting valve serves as a mediator that preserves the pressure differential information from the high pressure system while translating it to a scale readable by the low pressure gauge. The gauge accurately measures small pressure changes at its outlet that correspond to larger pressure variations in the inlet system
Solution Approach 2:
The pressure measurement function is segmented into two parts: the pressure limiting valve handles the high pressure side and limits pressure to safe levels, while the low pressure gauge handles the measurement of small pressure increments at the outlet. This segmentation allows each component to operate in its optimal range
3Productivity
If existing testing methods are used for backflow prevention devices, then testing can be performed, but the results are inaccurate and inconsistent
Solution Approach 1:
The pressure limiting valve is introduced as an intermediary in the testing setup, allowing accurate measurement of pressure drops across backflow prevention devices. The valve ensures that the testing gauge operates within its optimal pressure range while still measuring pressure differentials accurately
Solution Approach 2:
The testing method uses the pressure limiting valve to change the pressure parameter from high system pressure to a lower, gauge-appropriate pressure level. This parameter transformation enables accurate measurement of small pressure drops (e.g., 1-5 PSI) across the backflow prevention device while the system operates at much higher pressures
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 allows for accurate measurement of pressure drops across backflow prevention devices in high pressure systems without damaging the low pressure gauge, ensuring reliable and consistent testing results by preventing over-pressurization and maintaining gauge accuracy.
Implementation Method 1
An upper and a lower chamber are formed from an interior portion of the valve body and are generally separated by a flexible rubber diaphragm
Implementation Method 2
a spring actuable via movement of the flexible diaphragm in response to pressure changes in the valve body to generally bias a closure seat in an open position relative to the outlet when the valve body is not under pressure and facilitate compression to permit the closure seat to seal the outlet when pressure in the valve body approximately reaches a maximum PSI rating
Data Source
AI summary
The pressure limiting valve has a low pressure gauge configured to measure the operability of a backflow prevention device having a line pressure relatively higher than the maximum PSI rating of the low pressure gauge. The valve body has an inlet statically coupled to a pressurized fluid source and an outlet coupled to the low pressure gauge. Upper and lower chambers fluidly coupled via a conduit are formed from an interior portion of the valve body and generally separated by a flexible diaphragm. A spring actuable via movement of the flexible diaphragm in response to pressure changes in the valve body biases a closure seat in an open position relative to the outlet when the valve body is not under pressure, and compresses under pressure to permit the closure seat to seal the outlet when pressure in the valve body reaches a maximum PSI rating of the low pressure gauge.