VZO is a volumetric meter with an oscillating piston. The principle of volumetric metering ensures high precision with low flow rates and excellent endurance. VZO may be installed horizontally, vertically or at an angle. When used with burners, it may be fitted directly on the nozzle line.

Thanks to its materials - cast iron, brass and aluminium piston - VZO is particularly appropriate for metering non-aggressive liquid lubricants such as fuel oil or mineral oil.

VZO may be fitted with a pulse emitter. The variety of values and types of pulse make VZO compatible with all centralized technical management systems.


  • Volumetric meter
  • Designed for oil and fuel
  • Different pulse values
  • Low starting flow rate
  • Metrological data
    Nominal diameterDNmm48
    Starting flow ratel/h0.41.6
    Minimum flow rateQminl/h14
    Maximum flow rateQmaxl/h80200
    Permanent flow ratel/h50135
    Error tolerance of volume between Qmin and Qmax< ±1 %*< ±1 %*
    Repeatability< ±0.2 %< ±0.2 %
    * Error tolerance 0.5 ... 1 l/h = ±5% / 1 ... 2l/h = ±2.5%
    For burners and engines or motors, the meter must be selected on the basis of the nominal flow rate.
    Meters destined to 2 speed burners are selected knowing Qmax can't be exceeded with the higher mode.
  • Temperature and pressure
    Max. temperature°C50 or 80
    Nominal pressurebar25
  • Dimensions
    Nominal diameterDNmm48
    Width of mesh from prefiltre/filtremm0.125 / 0.080.15 / 0.1
    Threaded connectionsinches1/8"1/4"
    Weight without connectionkg0.650.75
  • Head loss
    Nominal diameterDNmm48
    kvs (deltaP=Q²/Kvs²) à 5 mPa.s0.220.5
  • Pulse emitter
    Nominal diameterDNmm48
    Weight of impulse in litre0.11
    This technology doesn't require straight length.