STX Series Sliding Vane Pumps

Blackmer® – part of PSG®, a Dover company logo
The stainless steel Blackmer® STX sliding vane pumps are designed for the fast loading and unloading of corrosive and non-corrosive fluids. They can offload a 22,700-liter tanker for as fast as 24 minutes. The STX pumps are self-priming and easy to maintain, with the sliding vanes as the only wear-prone parts. The non-metallic vanes are also easy to replace using only ordinary hand tools. Other notable features of the STX sliding vane pumps include run-dry capability, adjustable relief valves, weld flanges, and versatile mounting brackets.


  • Albany is a force to reckon with in the design and manufacture of high-quality positive displacement pumps, gear pumps, lobe pumps, and screw pumps.
  • Albany is a force to reckon with in the design and manufacture of high-quality positive displacement pumps, gear pumps, lobe pumps, and screw pumps.

Design Advantages

  • 316 stainless steel with external ball bearing for longer life with corrosive products
  • Pump design and operation minimises shear and agitation
  • Adjustable relief valve protects the pump against excessive pressures
  • Excellent self-priming and dry-run capabilities
  • Sustained performance and trouble-free operation
  • High suction lift and line-stripping capabilities
  • Easy to maintain – low maintenance and life cycle costs

Available Options

We customise pumps according to your application requirements. Contact us to know more about your options.

  • Vane material options
  • Sealing options
  • Elastomer options
  • Material options
  • Connection options
  • Porting options
  • Mounting/baseplates
  • Maintenance kits/spare parts

Key Specifications

  • Flow rates up to 946 L/min
  • Differential pressures up to 8.6 bar
  • Working pressures up to 12.1 bar
  • Viscosities up to 0.2 – 4,250 Cp


STX: Loading & unloading corrosive & non-corrosive fluids:

  • Sulfonic acids
  • Specialty chemicals
  • Solvents
  • Latex paints
  • Liquid sugars
  • Vegetable oils

STX-DEF: Loading & unloading corrosive & non-corrosive fluids:

  • Diesel Exhaust Fluid (DEF)
  • AdBlue


Flow rate Up to 946 L/min Up to 946 L/min
Differential pressure 8.6 bar Up to 8.6 bar
Max working pressure 12.1 bar Up to 12.1 bar
Viscosity 0.2 - 4,250 cP 0.2 - 4,250 cP


Blackmer sliding vane pumps use a rotor with sliding vanes to draw liquid into the pump. This rotor is located close to the wall of the cam so that a crescent-shaped cavity is formed on the opposite wall. Each rotor slot contains a sliding vane. As the rotor rotates, centrifugal force, hydraulic pressure, and push rods work together to extend each vane to the casing wall. This creates an expanding cavity on the inlet side – creating a vacuum that pulls liquid into the pump. The liquid is trapped between the vanes and the casing wall. The rotor rotation moves the liquid cavities around to the outlet side of the pump. The vanes are forced back into their slots at the outlet side, decreasing the cavity size and forcing the liquid through the outlet port.

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