FMI QG‑150 Low‑Flow Valveless Piston Pump 1/4 Shaft R405 Stainless Steel Pump Head

FMI QG‑150 Valveless Metering Pump with R405 Stainless Steel Head and 1/4" Shaft

The FMI QG‑150 is a low‑speed, low‑flow valveless piston pump designed for precise dosing in laboratory and light industrial applications. Coupled with the R405 stainless steel pump head and a 1/4" shaft, this compact system delivers accurate, drift‑free metering of aggressive and high‑purity fluids in a small footprint. Based on FMI’s CeramPump technology, the QG‑150 uses a single ceramic piston and matching cylinder to provide positive displacement flow without check valves, reducing pulsation, wear, and maintenance.

The QG‑150 is specified as a low‑speed, low‑flow drive with a catalog flow range of approximately 3.75 to 192 mL/min using standard FMI metering heads and settings

The QG‑150’s low‑speed drive and the R405 stainless head give you a tightly controlled low‑flow range ideal for reagent dosing, sampling, pH/chemical feed, and analytical support where over‑delivery cannot be tolerated. Stroke length is infinitely adjustable from 0 to 100%, allowing you to fine‑tune flow between the minimum and maximum rated rates while maintaining excellent repeatability. Standard wetted materials—316 stainless steel, ceramic, and fluorocarbon—offer broad chemical compatibility and long service life.

This modular pump design allows the R405 head to be removed quickly for cleaning or exchanged with other compatible FMI heads if your application or fluid changes. With continuous‑duty capability and stable low‑flow performance, the QG‑150 with R405 stainless head is a reliable choice for OEM skids, benchtop systems, and pilot‑scale processes requiring accurate low‑volume metering.

Product specifications

(QG‑150 with R405 stainless steel head, 1/4" shaft)

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

• The QG‑150 is specified as a low‑speed, low‑flow drive with a catalog flow range of approximately 3.75 to 192 mL/min using standard FMI metering heads and settings

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

• Pump head: R405 stainless steel metering pump head assembly (R‑series stainless fluid end).

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

• Nominal flow range for QG‑150 drive: 3.75 to 192 mL/min with standard low‑flow configuration.​

• Piston and cylinder: Ceramic piston with ceramic or carbon cylinder liner, stainless steel cylinder body for R405.

• Wetted materials: 316 stainless steel head/cylinder body, ceramic piston, ceramic or carbon liner, PTFE/fluorocarbon seals.

• Operating pressure: Typically up to 60–100 psig depending on specific R‑series stainless head configuration.

• Operating temperature: Up to about 140–177 °C for stainless‑body Q heads (verify exact R405 spec if needed).

• Flow adjustment: Stroke length infinitely adjustable from 0–100% in either direction; low‑speed fixed‑range drive for stable low‑flow operation.

• Flow direction: Reversible, no check valves required.​

• Duty cycle: Continuous duty with accuracy typically around ±1% or better in properly set‑up systems.

• Applications: Reagent dosing, chemical feed, sampling, pH control, analytical and general laboratory low‑flow metering.