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Blackmer® is the leading global provider of innovative, high-quality sliding vane, centrifugal, screw and regenerative turbine pump, and reciprocating gas compressor technologies for the safe transfer of liquids and gases.

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Sliding Vane Pumps

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Providing Innovative Product-Transfer Solutions for a Variety of Markets and Applications

Blackmer provides innovative product transfer solutions for many markets and applications, including in the chemical process, energy, transport, military & marine; general industrial, and oil & gas industries.

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General Industrial

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ML4 Pump 600

MLN Sliding Vane Pumps Ductile-Iron Pumps Ideal for Handling Thin to Highly Viscous Fluids

Model MLN Sliding Vane Pumps, part of the Heavy Duty Line of sliding vane pumps, are ideal for handling thin to highly viscous fluids such as oils, asphalts, molasses and adhesives. These positive displacement rotary pumps are constructed with ductile iron, and are ideal for handling everything from thin non-lubricating solvents, to highly viscous liquids or abrasive slurries. The MLN features internal self-lubricating carbon sleeve bearings and PTFE-impregnated shaft packing. Options include Blackmer® or commercial single or double mechanical seals.

Features and Benefits

  • Available with internal sleeve bearings with external stuffing box 
  • Modular bearing hub assemblies allow these pumps to be easily reconfigured in the field
  • Optional wear hardened parts available for abrasive applications
  • Jacketed pump head option for high temperature operation
  • Ductile-iron construction with bolt on, internal relief valve
  • Symmetrical bearing support assures even loading and wear for long life
  • Optional commercial mechanical seals
  • External shaft stuffing box accommodates most standard aftermarket mechanical seal configurations
  • Adjustable relief valve protects pump against excessive pressures
  • Advantages of sliding vane technology:
    • Unique sliding-vane pump design self-adjusts for wear to maintain flow rates
    • Excellent self-priming and dry-run capabilities
    • Sliding vane design provides sustained performance and trouble-free operation
    • Easy maintenance: vanes can be easily replaced without removing the pump from the piping system
    • High suction lift and line-stripping capabilities
    • Low maintenance and low life-cycle costs

Applications

  • Chemicals
  • Petroleum
  • Paint and coatings
  • Pulp and paper
  • Food processing
  • Oils
  • Asphalts
  • Molasses
  • Adhesives
UL-LISTED for use in Propane, Butane, and Anhydrous Ammonia

Performance and Specifications

AVAILABLE MODELS
  • MLN4
NOMINAL FLOW RATE
  • 590 gpm (2,233 L/min)
DIFFERENTIAL PRESSURE
  • 200 psi (13.8 bar)
MAXIMUM WORKING PRESSURE (MAWP)
  • 250 psi (17.2 bar)
Viscosity
  • 0.2 - 108,000 cP
TEMPERATURE
  • -25°F to 400°F (-32°C to 204°C)
MIN/MAX SPEED (rpm)
  • 68 - 600
PRIMARY MATERIALS OF CONSTRUCTION
  • Ductile Iron
CONNECTION ORIENTATION
  • Side Inlet | Side Outlet
VANE MATERIALS
  • Laminate
  • Bronze
  • Hardened Steel
AVAILABLE CERTIFICATES
  • Hydrostatic Test
  • Performance Test
  • NPSH Test
  • Material (actual or typical)
  • Dimensional (pump only or unit)

Dimensions

Pump Model L W H Approx. Wt.
MLN in 22-1/4 29-3/8 27-3/8 385 lb
mm 565.2 746.2 695.3 173 kg

Materials of Construction

Parts Materials
Casing, Heads, Hubs Ductile Iron: ASTM 536
Liner Ductile Iron: ASTM 536
Discs Cast Iron: ASTM A48

Pump Options

Options  Details
ORIENTATION OPTIONS Right Hand: INLET is to the right, when looking from driven side
Left Hand: INLET is to the left, when looking from driven side
PORTING OPTIONS Side Outlet: Outlet 180° inline porting
CONNECTION OPTIONS NPT (threaded)
MOUNTING OPTIONS Pump Only
Unit: Pump, Motor, Baseplate, Couplings, Guards
SEALING OPTIONS Blackmer single mechanical seal

Vane Options

Temperature Limits Viscosity
STD Laminate: Melamine Formaldehyde Resin/Fiber -25°F to 350°F (-32°C to 177°C) 0.2 - 4,250 cP
EC Laminate: Melamine Formaldehyde Resin/Fiber -25°F to 350°F (-32°C to 177°C) 0.2 - 8,500 cP
EC Bronze ASTMB30-54-3A -25°F to 400°F (-32°C to 204°C) 105 - 108,000 cP
EC Hardened Ductile Iron -25°F to 400°F (-32°C to 204°C) 105 - 108,000 cP

Elastomer Options

Temperature Limits
FKM -15°F to 400°F (-26°C to 204°C)
PTFE - SS Spring -0°F to 400°F (-18°C to 204°C)

Downloads

Installation Operation Manuals (IOMs)

MLX4B, MLXW4B, MRLX4B, MRLXW4B, MLN4B, MRLN4B
MLX4B, MLXW4B, MRLX4B, MRLXW4B, MLN4B, MRLN4B
MLX4B, MLXW4B, MRLX4B, MRLXW4B, MLN4B, MRLN4B

Materials of Construction

Performance Curves

MLX4, MLXW4, MLN4, MRLX4, MRLXW4, MRLN4