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Dwyer VFLO | Venturi Flowmeter with Magnehelic Gauge | 1" to 4" Line Sizes, ±2.5% FS
The Dwyer VFLO is an aluminium venturi flowmeter paired with a Magnehelic® differential pressure gauge, offered in line sizes from 1" to 4" for pressure or vacuum air duty. Its progressive venturi profile keeps pressure loss low, and each meter is calibrated at standard air conditions with a dual SCFM and in w.c. scale.
- Female NPT process connection matching the nominal line size
- Gauge rated -20" Hg to 15 psig; 35 psig with MP option
- Accuracy of ±2.5% of full scale
- Use vertically or horizontally by rotating the gauge
- 4" (101.6 mm) dial with dual SCFM and in w.c. scales
- Reference charts for various flow conditions supplied
- Specifications
- Features
- Downloads
| Part Number | VFLO |
| Brand | Dwyer |
| Type | Venturi flowmeter with Magnehelic® gauge |
| Line Sizes | 1" to 4" |
| Accuracy | ±2.5% FS |
| Scales | SCFM and in w.c. |
| Process Connection | Female NPT of nominal line size |
| Dial Size | 4" (101.6 mm) |
| Gauge Housing | Die cast aluminium case and bezel, acrylic cover |
| Pressure Limits | -20" Hg to 15 psig (-0.677 to 1.034 bar); MP option 35 psig (2.41 bar) |
| Temperature Limits | 20 to 140°F (-6.67 to 60°C) |
| Overpressure | Relief plug opens at approx. 25 psig |
| Gauge Weight | 1 lb 2 oz (510 g); MP & HP 2 lb 2 oz (963 g) |
- Gradual Venturi profile helps to ensure a more accurate measurement to satisfy measurement criteria by reducing pressure losses through the meter.
- The clear, undistorted plastic face of the gauge makes it easy to read from a distance.
- A patented design that reacts quickly to pressure changes means that important circumstances are assessed without delay.
- Long service life and reduced downtime are achieved by combining high-quality components with a robust and durable casing.
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