Dwyer VFB-51-SSV Visi-Float Acrylic Flowmeter 2-20 SCFH Air 4" Scale

Dwyer VFB-51-SSV Visi-Float Acrylic Flowmeter 2-20 SCFH Air 4" Scale

The Dwyer VFB-51-SSV is a Visi-Float variable area flowmeter (rotameter) machined from solid acrylic, calibrated for air flow in the range of 2 to 20 SCFH (standard cubic feet per hour). The SSV suffix designates an integral stainless steel needle valve at the inlet, allowing direct flow adjustment without a separate valve. The 4-inch scale provides a clear, readable graduation for precise flow setting.

Specifications & What's Included

• Model: VFB-51-SSV
• Series: Dwyer Visi-Float VFB
• Flow medium: Air
• Flow range: 2–20 SCFH (standard cubic feet per hour)
• Scale length: 4 inches
• Body material: Machined solid acrylic
• Valve: Integral needle valve (SSV) with knurled adjustment knob
• Inlet/outlet: Threaded fittings (visible at both ends)
• Maximum pressure: 100 PSIG (per VFB series caution label visible in photos)
• Maximum temperature: 125°F (per VFB series caution label)
• Made in USA (Michigan City, Indiana)
• Includes: Original Dwyer Series VFB box

Applications

The Dwyer Visi-Float VFB series is a widely used line of compact, low-cost acrylic rotameters designed for monitoring and controlling gas and liquid flows in laboratory, industrial, and HVAC applications. Air-calibrated models like this one are commonly used to set and verify flow rates in pneumatic control systems, gas distribution panels, purge lines, analytical instrument sample streams, and process equipment requiring a fixed or adjustable air supply. The integral needle valve makes the VFB-51-SSV a self-contained flow-control point — no separate regulator valve is needed at the measurement location. The clear acrylic body gives an unobstructed view of the float at all times, which is the defining feature of the Visi-Float design. These flowmeters are still in everyday use in laboratory benches, environmental monitoring equipment, and light industrial process lines where a simple, reliable, visual flow indicator is needed.