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.
The FQPV2 Low Flow Control Valve
- 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
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