The BLACKLINE Series MD is a motor driven, spring return mechanical diaphragm metering pump for precise and accurate metering control. With many standard features, the Series MD includes oil lubricated ball bearings in a die-cast aluminum housing, long life reinforced PTFE diaphragm, micrometer style stroke length adjuster and many liquid end material options to suit any application.
Nine distinct models are available, having flow capabilities to 132 GPH (500 LPH) and pressures to 150 PSI (10 BAR), with a standard turndown ratio of 10:1 or up to 100:1 with the optional VFD Vector. Metering performance is reproducible to within ± 2% of maximum capacity.

Standard Features

  • Liquid End Materials – GFPPL, 316 SS & PVDF.
  • Rugged double-sided PTFE faced, long life diaphragm.
  • Oil lubricated ball bearings in a die-cast aluminum housing.
  • Manual micrometer style stroke adjustment; 10:1 turndown or up to 100:1 with the optional VFD Vector.
  • Standard NEMA 56C or IEC71 motor frames available.


Optional Features

  • Variable Frequency Drive for Automatic Control.
  • Fully Scalable 4-20mA, 0-10VDC signals.
  • NEMA 4X Enclosure.
  • ATEX Group II, Category 3 – Zone 2/22 for non-flammable liquids with proper motor selection.


General Specifications  

Pump Head Materials PVDF, GFPPL, 316SS
Turndown Ratio 10:1 or 100:1 with the optional VFD Vector Drive
Wetend PVDF, GFPPL, 316SS
Seat O-Rings Available PTFE, PVC, 316SS, Incoloy 825
Diaphragms Rugged double-sided PTFE faced with drive side support ring
Connections NPT, BSPT
Ball Checks Available Pyrex, 316SS, Hatelloy C-276
Accuracy and Repeatability Reproducibility of +/-2% of max capacity
Product Options

VFD Vector

Accessories Back Pressure Valves KOP Kits Pulsation Dampeners Y Strainers Pressure Relief Valves Y-Strainers


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