FQB2 Proportional High Flow Control Valves

The FQB2 high flow control valve is a proportional compressed gas flow control assembly. The assembly consists of an FQB2-Series proportional control valve, a PSR volume booster and an F-Series high speed flow transducer. The FQB2 control valve consists of two normally closed solenoid valves, a control circuit board and an IP65 protective canister.

The FQB2 operates by comparing the user’s electronic command input signal to the signal that is returned to the FQB2 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 from the dome of the PSR (which causes the PSR to exhaust downstream gas) while opening the other solenoid valve adds compressed gas (to the dome of the PSR) from the supply. The volume of compressed gas on the dome of the PSR regulator sets the output flow rate. The FQB2 high flow control valve continuously monitors the user command and F-Series feedback signals to keep the assemblies flow rate at the desired point.


The FQB2 high 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 high flow control

FP high flow control

Fa high flow control


Learn more about the different models

FR high flow control valve FP high flow control valve

  • Accuracy: ±4% F.S.
  • Repeatability: ±0.25% F.S.
  • Max Flow: 25 to 250 SCFM (708-7080 LPM)
  • Min Flow: 3 to 30 SCFM (85-850 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 high flow control valve



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