Airflow Balancing Valve With In-Situ Constant Flow Adjustment
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Solution Overview
Problem
Conventional HVAC systems require labor-intensive manual adjustments to balance airflow, which is inefficient and costly due to the need for manual calibration and inability to accommodate changes in duct pressure and other systemic issues.
Innovation Solution
An automatic airflow balancing valve with an adjustable mechanism that allows in-situ adjustment of airflow without accessing the valve's housing, featuring a rotary damper and visual indicators for easy calibration, and a universal snap-in adapter for versatile installation, enabling constant airflow regulation despite varying pressure differentials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual adjustment mechanisms are used in conventional HVAC valves, then airflow can be regulated, but labor-intensive balancing procedures are required and adjustments cannot be made without disassembling the valve housing
Solution Approach 1:
The valve body is divided into functional segments: a fixed housing containing the damper mechanism, and a separate adjustable component (rotatable element) that can be accessed through the inlet/outlet. This segmentation allows the adjustment mechanism to be operated independently without disassembling the main valve housing, enabling technicians to make airflow adjustments by simply rotating an externally accessible element.
Solution Approach 2:
A visual indicator system acts as an intermediary between the internal damper position and the external user. The indicator provides real-time feedback on airflow settings without requiring the technician to disassemble or visually inspect internal components, enabling accurate adjustment through the inlet or outlet while maintaining the sealed housing structure.
2Measurement precision
If fixed dampers are manually adjusted throughout the building, then airflow balancing can be attempted, but the process is challenging to perform accurately and does not accommodate changes in duct pressure
Solution Approach 1:
The valve incorporates a dynamic adjustment mechanism where the rotatable element can be easily repositioned to change the damper angle. This dynamic capability allows the valve to adapt to varying duct pressure conditions by simply rotating the accessible element, without requiring complex recalibration procedures or system shutdowns. The visual indicator ensures precise positioning at each adjustment stage.
Solution Approach 2:
The valve enables direct manipulation of the airflow parameter through external rotation of the adjustable element, which changes the damper opening angle. This direct parameter control, combined with visual feedback indicators, allows accurate airflow balancing while the simple mechanical design naturally adapts to pressure changes without requiring additional calibration steps.
3Reliability
If conventional manual balancing procedures are used, then airflow regulation is achieved, but the labor intensive process greatly increases the cost of deploying the system
Solution Approach 1:
The valve design enables self-service adjustment where a single technician can perform balancing procedures independently without requiring system shutdowns, multiple personnel, or complex tools. The externally accessible rotatable element with visual indicators allows one person to accurately adjust airflow settings at each terminal, significantly reducing labor time and deployment costs while maintaining reliable airflow regulation.
Data Source
AI summary
An automatic airflow balancing valve (10), including: a housing (12) having an inlet (14) and an outlet (16) and defining a flow path (18) there through; a valve disc (30) operatively connected to the housing and disposed within the flow path; and an airflow volume calibrating assembly (92) disposed in the flow path and operatively connected to the valve disc and the housing to pivot the valve disc to a home position associated with a desired constant airflow volume. The airflow volume calibrating assembly includes an adjustment element that extends toward at least one of the inlet or the outlet.