FMI QG‑150 Low‑Flow Valveless Piston Pump 1/4 Shaft RH00 RH Series Pump Head

FMI QG‑150 Valveless Metering Pump with RH00 Low‑Flow RH Series Pump Head and 1/4" Shaft

The FMI QG‑150 low‑flow valveless piston pump with RH00 RH‑series pump head is designed for precise, drift‑free dosing in laboratory, analytical, and OEM process applications. The low‑speed QG‑150 drive provides a controlled flow range in the low‑to‑medium mL/min region, while the RH00 miniature head delivers high‑resolution displacement for micro‑dosing and continuous low‑flow metering. Using FMI’s Ceram Pump valveless piston technology, the system has only one moving part in the fluid path, reducing pulsation, eliminating check valves, and minimizing maintenance.

Maximum flow rate (QG‑150 rating): Approximately 48 mL/min at full stroke and rated maximum speed for the QG‑150 low‑flow configuration

RH‑series pump heads feature a ceramic piston and cylinder with PVDF or ETFE casing, giving excellent chemical resistance and long service life at pressures up to 30 psig. Flow is infinitely adjustable from zero to the QG‑150’s rated maximum via the Q‑series linear “10‑0‑10” stroke control, allowing you to fine‑tune delivery without changing hardware. This configuration is ideal for chemical feed, reagent dosing, analytical instruments, micro‑reactor supply, and general lab metering where accurate low‑flow performance is critical.

Product specifications

(QG‑150 with RH00 head, 1/4" shaft)

• Pump model: FMI QG‑150 low‑speed, low‑flow valveless metering pump drive.

• Maximum flow rate (QG‑150 rating): Approximately 48 mL/min at full stroke and rated maximum speed for the QG‑150 low‑flow configuration

• Pump type: Positive displacement, valveless CeramPump piston pump.

• Pump head model: RH00 RH‑series low‑flow miniature valveless piston pump head.

• Shaft size: 1/4" diameter shaft for standard coupling and mounting.

• Nominal flow capability of QG‑150 drive: Approximately 0 to 48 mL/min with suitable heads and stroke/speed settings.​

• RH‑series operating range: Designed for precise metering up to about 360 mL/min at higher speeds; low‑flow RH00 variants support very low mL/min flows with 6 rpm minimum speed.

• Min. motor speed (RH data baseline): 6 rpm typical for catalog min‑flow data on RH heads.​

• Wetted materials (RH series typical): Ceramic piston, ceramic or carbon cylinder, PVDF or ETFE casing, optional stainless hardware; 30 psig max pressure rating.

• Operating temperature: Up to 100 °C for ceramic/PVDF or ETFE RH heads (higher for stainless configurations, non‑operating autoclave conditions).

• Inlet/outlet connections: 1/4" OD tubing or 1/4‑28 female low‑dead‑volume ports depending on RH00 version.

• Flow adjustment: Stroke length infinitely adjustable from 0–100% in either direction via Q‑series scale.

• Flow direction: Reversible; direction changes by crossing the zero point on the scale, no check valves.​

• Accuracy: Drift‑free metering with typical accuracy better than ±1% and CV ≈0.5% when properly calibrated.

• Applications: Chemical feed, reagent dosing, analytical instruments, pilot‑scale process control, sampling, and micro‑reactor or low‑flow lab processes.