FQB3 Medium Flow Control Valves

The FQB3 medium flow control valve is a compressed gas flow control assembly. The assembly consists of an FQB3-Series proportional control valve and an F-Series high speed flow monitor. The FQB3 medium flow control valve consists of two normally closed solenoid valves, an integrated volume booster, a control circuit board and a protective canister.

The FQB3 operates by comparing the user’s electronic command input signal to the signal being returned to the FQB3 from the F-Series flow monitor. The on-board control circuit examines any differences between these signals and actuates the solenoid valves in response. Opening one solenoid valve removes compressed gas while opening the other solenoid valve adds compressed gas from the supply. The FQB3 continuously monitors the user command and F-Series feedback signals to keep the assemblies flow rate at the desired point.


The FQB3 medium flow control valve is offered in 3 distinct flow control models.

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

FR Medium flow control

FP Medium Flow Control

FA Medium flow control


Learn more about the different models

FR FQB3 medium flow control FP FQB3 medium flow control

  • Accuracy: ±4% F.S.
  • Repeatability: ±0.25% F.S.
  • Max Flow: 2.5 to 25 SCFM (71-708 LPM)
  • Min Flow: 1 to 10 SCFM (28-280 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

FA FQB3 medium flow control



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