Variable Area Flowmeters for Gases with attractive Design

Variable Area Flowmeters (VA-Flowmeters) for Gases Q-Flow

Our proven Q-Flow is a modern VA-flowmeter for gases built on the variable area principle.

Designed in close collaboration with users, it combines our long experience and practical shop-floor requirements.

Measuring Tubes in 2 Sizes

The flowmeters are available with glass tube lengths of 80mm and 140mm.

Measuring ranges from 0.06 ln/min up to 50 ln/min for Air @ 1013 mbar abs / 20°C
Maximum pressure: 10 bar / Maximum temperature: 100°C

Variable Area Flowmeters Q-Flow with 2 measuring tube sizes

Intelligent Instrument Design

The compact and attractive design enables quick replacement of components

Standard scale for air

The measuring glass is supplied with a standard scale for air (operating conditions 20°C / 1013mbar abs). Conversion factors for other gases and other operating conditions are available.
mm-scale with flow rate table and direct reading scales for other gases and pressures on request.

Aluminium body

The bodies are available in aluminium. Sealing material FKM.
Body in stainless steel 1.4305 and sealing materials EPDM or FFKM on request.

Tightly closing precision control valves

The devices are equipped with precise, hysteresis-free 15-way control valves. See Needle Valves M-Flow for more information.
Various rotary knobs are available on request.

Customized versions

We also offer custom designed products. Get in touch with us for further information!

Types & Options Q-Flow Variable Area Flowmeters (VA-Flowmeters)

Variable Area Flowmeters (VA-Flowmeters) for Gases Q-Flow – Aluminium Version


Q-Flow Variable Area Flowmeter
Aluminium version without valve

Variable Area Flowmeters (VA-Flowmeters) for Gases Q-Flow with valve


Q-Flow Variable Area Flowmeter
Aluminium version
Valve at the Inlet

Variable Area Flowmeters Q-Flow with 2 measuring tube sizes

Q-Flow Variable Area Flowmeter
The flowmeters are available in two sizes with valve at the inlet and without valve.
Body in stainless steel 1.4305, sealing materials EPDM and FFKM and valve at the outlet on request.

Downloads Q-Flow Variable Area Flowmeters (VA-Flowmeters)

139-2011_de_infoQ-flow.pdfQ-Flow Product InformationProduct DatasheetsEN, DEEN, DE
139-3005_de_manualqflow.pdfQ-Flow Operating InstructionsOperating InstructionsEN, DEEN, DE
811-1234_ml_flowline-QSG.pdfFlowline (Q-Flow/M-Flow) Quick Start GuideOperating Instructions


Looking for a Digital Alternative?

Battery Powered Digital Mass Flow Meters with Needle Valve

  • AA battery powered device with touch display
  • MEMS sensor technology
  • High accuracy & dynamics
  • Wide choice of flow units
  • Use as a meter, regulator or switch
  • Measuring ranges from 25 mln/min up to 450 ln/min