Balancing Valve Flow Rate Scale for Direct Field Calibration
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Solution Overview
Problem
Current balancing valves require users to consult external references for flow rate settings, leading to increased complexity and reduced accuracy due to arbitrary numbering schemes and lack of clear calibrations in tenths of a gallon per minute (GPM), making it difficult to set precise flow rates.
Innovation Solution
A balancing valve with a flow rate scale that allows users to set exact flow rates in one operation by providing a relationship between the valve position and flow characteristics, featuring 25 hash marks with 23 calibrated in tenths of GPM, enabling easy interpolation between settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a flow rate scale with arbitrary numbering scheme or percentage-based calibration is used, then the valve can indicate position settings, but the user cannot directly determine exact flow rates without consulting external references
Solution Approach 1:
The patent combines the flow rate scale directly with the valve body, integrating the measurement function into the valve itself. The scale is printed or engraved on the valve body with hash marks representing specific flow rates, eliminating the need for separate external references while providing direct flow rate indication at the point of use.
Solution Approach 2:
The valve becomes self-sufficient by incorporating its own flow rate calibration scale. Users can directly read the flow rate setting from the scale on the valve body without needing external flow curves, balance calculators, or additional reference materials, making the system self-service and reducing overall complexity.
2Adaptability or versatility
If a flow rate scale with hash marks in hundredths of GPM is used, then more intermediate settings are available, but visual interpolation between tenths of GPM becomes more difficult
Solution Approach 1:
The patent applies different visual characteristics to different parts of the scale. Hash marks for tenths of GPM are made longer and more prominent, while hash marks for hundredths of GPM are shorter and less prominent. This local differentiation allows users to easily identify and interpolate between tenths of GPM while still having access to finer hundredth-level adjustments when needed.
Data Source
AI summary
A balance or flow limiting valve features a valve body/member having a flow rate indicator/scale containing setting having printed flow rates calibrated in units of measure in volume per time increment between a minimum flow rate position (MIN) and a maximum flow rate position (MAX); and a knob/handle having a position indicator and being moveable to any continuous position on the flow rate indicator/scale between MIN and MAX in response to a user applied force, where the relationship between the flow rate indicator/scale and the position indicator is based on calibrated flow characteristics of the balance or flow limiting valve. The user can set an exact desired flow rate in one operation by moving the knob/handle to a desired position between MIN and MAX without consulting a printed flow curve or balance calculator to determine the desired exact flow rate.