Dwyer VFA-4-SSV Variable Area Flow Meter 1-10 SCFH Air Acrylic Body

Dwyer VFA-4-SSV Variable Area Flow Meter 1-10 SCFH Air Acrylic Body

The Dwyer VFA-4-SSV is a variable area flow meter (rotameter) designed for measuring air flow rates in the 1–10 SCFH range. It features a clear acrylic tube body with a graduated scale, a stainless steel float, and an integral needle valve for in-line flow adjustment. The unit is part of Dwyer's VFA Series and was manufactured by Dwyer Instruments, Inc. in Michigan City, Indiana.

Specifications & What's Included

• Manufacturer: Dwyer Instruments, Inc. — Michigan City, Indiana, USA
• Model / Cat. No.: VFA-4-SSV
• Type: Variable area flow meter (rotameter) with integral needle valve
• Flow range: 1–10 SCFH (Standard Cubic Feet per Hour)
• Media: Air
• Tube body: Clear acrylic
• Valve trim: Stainless steel (SSV designation)
• Inlet fitting: Brass NPT male (bottom left, as photographed)
• Outlet fitting: Stainless compression-style fitting (top)
• Additional brass NPT fitting visible on rear outlet port
• Scale: Graduated 1–10, labeled SCFH AIR on front face
• Date code: S 34L (visible on body label)
• Made in USA

Applications

Variable area flow meters like the Dwyer VFA Series are widely used in industrial, laboratory, and process control settings to monitor and regulate low-flow gas streams. The VFA-4-SSV is suited for air purge lines, pneumatic instrument supply verification, gas sampling systems, and small-scale process gas metering where a visual indication of flow rate is needed. The integral needle valve allows the operator to set and fine-tune flow directly at the meter without a separate valve, making these units common on instrument panels, analytical systems, and bench-top test rigs. Dwyer's VFA Series has been a standard low-cost rotameter line in North American industry for decades, frequently found in chemical processing, HVAC controls, and laboratory gas distribution systems.