FQPV Low Flow Control Valves

The FQPV low flow control valve is able to control gas flow rates as low as 2 SCFH to as high as 1 SCFM. For flow rates below one standard cubic foot per minute (scfm), an F-series flow transducer can be used as electronic feedback to an FQPV control valve.

The FQPV has an internal analog PID (proportional, integral & derivative) control circuit which matches the user provided electronic command signal to the electronic flow rate feedback signal from the F-series flow transducer. The circuit achieves this by modulating the drive current to a linearly-variable proportional solenoid valve inside the FQPV low flow control valve. Because direct proportional solenoid control is limited to low flow rates, this complete flow control package is limited to 1 scfm. However, direct control with a proportional solenoid does allow for extremely high resolution flow control.

The FQPV low flow control valve is offered in 3 distinct low flow control models.

Understanding the difference between these models is imperative for proper specification into an application.

FQPV low flow control

FQPV low flow control

FQPV low flow control

Learn more about the different models

The FQPV2 Low Flow Control Valve

FP - low flow controlFA - low flow control


  • Accuracy: ±4% F.S.
  • Repeatability: ±0.25% F.S.
  • Max Flow: 10 to 60 SCFH (5-28 LPM)
  • Min Flow: 2 to 20 SCFH (0.94-9.4 LPM)
  • Durability: Immune to shock & vibration (up to 20 Gs)
  • Operating Temps: 32-158°F (0-70°C)
  • Filtration Recommended: 40 Micron
  • Protection Rating: IP65
  • Can be O2 Cleaned: Yes
  • Turn-Down Ratio: 10:1

FR - low flow control

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