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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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Blackmer STX3 Sliding Vane Pump 600 Blackmer STX2 Sliding Vane Pump 600

STX Sliding Vane Pumps Stainless-Steel Pumps Designed for Fast Fluid Off-Loading

Blackmer® STX Series pumps, which are part of the Stainless Line of sliding vane pumps, offer fast fluid off-loading for high-temperature, high-viscosity applications. For example, typical off-loading of a 6,000 gallon (22,700 liter) tanker can be unloaded as quickly as 24 minutes. These pumps are made from 316 stainless steel with external ball bearings, non-metallic Duravanes, PTFE elastomers, and Blackmer chemical mechanical seals. STX pumps feature an adjustable relief valve, versatile mounting bracket, weld flanges and are self-priming.

The STX Series is designed to offer easy maintenance because the internal wear is almost completely limited to the sliding vanes, which can be replaced with ordinary hand tools.

Features and Benefits

  • 316 stainless-steel pump with external ball bearing construction, Blackmer chemical mechanical seals and non-metallic vanes for longer life with corrosive products
  • Available in 2- and 3-in sizes
  • Pump design and operation minimizes shear and agitation
  • 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


Loading & unloading corrosive & non-corrosive fluids:

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

Performance and Specifications

  • STX2
  • STX1220
  • STX3
  • STX2A: 7 - 60 gpm (27 - 227 L/min)
  • STX1220A: 45 - 92 gpm (171 - 348 L/min)
  • STX3: 85 - 250 gpm (322 - 946 L/min)
  • 125 psi (8.6 bar)
  • 175 psi (12.1 bar)
  • STX2A: 0.2 - 990 cP
  • STX1220A: 0.2 - 22 cP
  • STX3: 0.2 - 4,250 cP
  • -25°F to 240°F (-32°C to 115°C)
  • STX2A: 150 - 800
  • STX1220A: 700 - 1,200
  • STX3: 300 - 800
  • Stainless Steel
  • Side Inlet | Top Outlet
  • Duravane
  • Hydrostatic Test
  • Performance Test
  • NPSH Test
  • Material (actual or typical)
  • Dimensional (pump only or unit)


Pump Model L W H Approx. Wt.
STX2A, STX1220A in 16-3/4 9-4/7 8-2/3 70 lb
mm 425.4 242.9 220.6 32 kg
in 20-2/3
12-5/8 11-5/9
132 lb
mm 524.5
60 kg

Materials of Construction

Pressure Parts Materials
Cylinder, Heads, Relief Valve Cover 316 Stainless Steel: ASTM A743, CF-8M

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 Top Outlet: Outlet 90° offset from inlet
Connection Options STX3: 3-in. butt weld stainless steel
STX2, STX1220A: 2-in. butt weld stainless steel
Mounting Options Pump only
Sealing Options Blackmer single mechanical seal

Vane Options

Material Temperature Limits Viscosity
Duravane   -25°F to 240°F (-32°C to 115°C) STX2A: 0.2 - 990 cP
STX1220A: 0.2 - 22 cP
STX3: 0.2 - 4,250 cP

Elastomer Options

Material Temperature Limits
PTFE - SS Spring -25°F to 240°F (-32°C to 115°C)