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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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Blackmer Markets

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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TXV2 cutaway 600

TXV & TransMax® Sliding Vane Pumps High-Temperature Rotary Vane Pumps for Asphalts and Viscous Fluids

Blackmer® TXV and TransMax® pumps, which are part of the Iron Line of sliding vane pumps, feature and open-rotor design and have been specifically designed for the high-temperature transfer of thick, viscous fluids, including asphalts. The key to the versatility of these pumps is the unique Blackmer sliding vane rotor design that self-adjusts for wear to provide a sustained, high level performance over a wide viscosity range. Slow operating speeds and non-pulsating flow minimizes shear and agitation of the fluid.

TXV pumps delivers more fluid per revolution than comparably ported gear pumps. And slower operating speeds mean longer service life and reduced maintenance requirements. These pumps come standard with bronze vanes, and are available in 2.5- and 3-in port sizes.

Available in TX206A and TX400 models, TransMax pumps come standard with Blackmer Duravanes. TransMax pumps are available with a corrosive fluids option that includes nickel plating, PTFE-encapsulated elastomers and 316 stainless steel mechanical seals. Other options include PTFE-encapsulated elastomers, bronze face mechanical seals, bronze vanes and a hydraulic drive option.

Features and Benefits

  • External roller ball bearings support the rotor from both sides, creating a stable environment for the internal mechanical seals
  • Ideal for handling viscous or shear sensitive fluids
  • Special open rotor design that offers easy flushing, bronze vanes, FKM elastomers, PTFE lip seals (available on TXV pumps only)
  • Blackmer mechanical seal and ball-bearing construction provide maximum reliability
  • Internal mechanical seals allow for extended dry run and continuous operation with non-lubricating liquids
  • Symmetrical bearing support assures even loading and wear for long life
  • Slower operating speeds means longer service life and reduced maintenance requirements
  • High-performance capabilities including self-priming and line clearing
  • External ball-bearings are isolated from pumpage by mechanical seals to maximize bearing life and minimize contamination risk
  • TransMax options include:
    • Corrosive fluids option that includes nickel plating, PTFE-encapsulated elastomers and 316 stainless steel mechanical seals
    • PTFE-encapsulated elastomers, bronze face mechanical seals, bronze vanes and a hydraulic drive option
  • 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


Transport delivery, fleet refueling, & bulk transfer:

  • Asphalts
  • Greases
  • Lube oils
  • Resins
  • Molasses
  • Bunkered fuels
  • Inks
  • Adhesives

Performance and Specifications

Available Models
  • TXV2.5
  • TXV3
  • TX206
  • TX400
  • TXV2.5: 80 - 136 gpm (302 - 513 L/min)
  • TXV3: 175 - 276 gpm (662 - 1,043 L/min)
  • TX206: 94 - 203 gpm (356 - 768 L/min)
  • TX400: 200 - 400 gpm (757 - 1,514 L/min)
Differential Pressure
  • 125 psi (8.6 bar)
Maximum Working Pressure (MAWP)
  • 175 psi (12.1 bar)
  • 0.2 - 10,500 cP
  • TXV: -25°F to 375°F (-32°C to 191°C)
  • TransMax: -25°F to 240°F (-32°C to 116°C)
Min/Max Speed (rpm)
  • TXV: 200 - 640
  • TransMax: 400 - 800
Primary Materials of Construction
  • Cast Iron
Connection Orientation
  • Side Inlet | Top Outlet
Vane Materials
  • TXV: Bronze
  • TransMax: Duravane
Catalog Options
  • Connections: NPT, Weld, Victaulic
  • Elastomers:
    • TXV: FKM standard, PTFE option
    • TX206: FKM standard, PTFE option
    • TX400: Buna-N standard, FKM option
  • Valve: Corrosion resistant
  • Inlet Strainer, Hydraulic Motor Adapter
  • Hydrostatic Test
  • Performance Test
  • NPSH Test
  • Material (actual or typical)
  • Dimensional (pump only or unit)


Pump Model L W H Approx. Wt.
TXV2.5 in 17-3/4 10-3/4 9-5/8 90 lb
mm 450.9 273.1 244.5 41 kg
TXV3 in 19-4/9 13-1/2 12-4/5 149 lb
mm 493.7 342.9 325.4 68 kg
TX206 in 19-5/16 15-1/8 12-3/8 146 lb
mm 491 384 314 66 kg
TX400 in 22-3/4 12-13/16 14 192 lb
mm 578 326 356 87 kg

Materials of Construction

 Pump Model Pressure Parts Materials
TXV2.5, TXV3 Cylinder, Heads, Relief Valve Cover Cast Iron: ASTM A48
TX206, TX400 Cylinder, Heads Ductile Iron: ASTM 536
Relief Valve Cover
Cast Iron: ASTM A48

Pump Options

Options Details
Orientation Options Double End: drive pump from either side
Porting Options Top Outlet: Outlet 90° offset from inlet
Connection Options NPT (threaded), Welded, Victaulic
Mounting Options Pump Only with Hydraulic Motor Adapter and/or Inlet Strainer
Sealing Options Blackmer single mechanical seal
Lip Seal – Turcon

Vane Options

Materials Temperature Limits Viscosity
Bronze -25°F to 350°F (-32°C to 177°C) 105 - 10,500 cP
Duravane -25°F to 240°F (-32°C to 115°C) 0.2 - 4,250 cP
EC Laminate -25°F to 350°F (-32°C to 177°C) 0.2 - 8,500 cP

Elastomer Options

 Pump Models Material Temperature Limits
TXV2.5, TXV3 FKM -25°F to 350°F (-32°C to 177°C)
TX206 FKM standard, PTFE option -25°F to 350°F (-32°C to 177°C)
TX400 Buna-N standard, FKM option -25°F to 240°F (-32°C to 116°C)