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Blackmer STX3 DEF Pump 600 Blackmer STX2 DEF Pump 600 Blackmer STX2 DEF Sliding Vane Pump_3 Blackmer SX-1 DEF Pump 600

DEF Sliding Vane PumpsFast-Fluid Off-Loading Pump that Meets or Exceeds All DEF Aqueous Urea Solutions Specifications

Blackmer® STX DEF Series Pumps, which are part of the Stainless Line of sliding vane pumps, meet or exceed all industry specifications for DEF Aqueous Urea Solutions (AUS32), also known as AdBlue®. Made from 316 stainless steel, the pumps are compatible with DEF and feature external ball bearings, non-metallic Duravanes, PTFE elastomers and Blackmer chemical mechanical seals. The design also includes an adjustable relief valve, weld flanges and self-priming capability. The STX3-DEF has a versatile mounting bracket.

STX3-DEF pumps offer fast fluid off-loading. For example, typical off-loading of a 6,000 gallon (22,700 liter) tanker can be unloaded as quickly as 24 minutes. The Blackmer non-metallic vanes self-compensate for wear and allow the STX DEF Series pumps to run dry for short periods of time for self-priming and blowing lines clean, without pump damage. The STX DEF 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.

For applications that require smaller flow rates, the Blackmer SX1-DEF Series Pump constructed from 304 & 316 stainless steel, offers 2 to 10 gpm (8 - 38 L/min) values. 

Now hear from our customers about what they had to say about Blackmer STX-DEF Series Sliding Vane Pumps:

Features and Benefits

  • Meets or exceeds all industry specifications for DEF Aqueous Urea Solutions (AUS32)
  • 316 stainless-steel pump with external ball bearing construction (SX1 model has 304 stainless steel for the cylinder and 316 stainless steel for the head).
  • Blackmer chemical mechanical seals and non-metallic vanes for longer life with corrosive products
  • 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
    • High suction lift and line-stripping capabilities
    • Low maintenance and low life-cycle costs


Loading & unloading corrosive & non-corrosive fluids:

  • Diesel Exhaust Fluid (DEF)
  • AdBlue

Performance and Specifications

  • STX2-DEF
  • STX1220-DEF
  • STX3-DEF
  • SX1-DEF
  • STX2-DEF: 0.2 - 990 cP
  • STX1220-DEF: 0.2 - 22 cP
  • STX3-DEF: 0.2 - 4,250 cP
  • SX1-DEF: 0.2 - 7 cP
  • STX2-DEF: 150 - 800
  • STX1220-DEF: 700 - 1,200
  • STX3-DEF: 300 - 800
  • SX1-DEF: 1,450- 1,750
  • STX-DEF: 125 psi (8.6 bar)
  • SX1-DEF: 25 psi (1.7 bar)
  • STX-DEF: 175 psi (12.1 bar)
  • SX1-DEF: 50 psi (3.4 bar)
  • STX-DEF: Side Inlet | Top Outlet
  • SX1-DEF: Side Inlet | Side Outlet
  • -25°F to 240°F (-32°C to 115°C)
  • Duravane
  • Stainless Steel
  • Hydrostatic Test
  • Performance Test
  • NPSH Test
  • Material (actual or typical)
  • Dimensional (pump only or unit)
  • STX2-DEF: 16 - 60 gpm (61 - 227 L/min)
  • STX1220-DEF: 45 - 92 gpm (170 - 348 L/min)
  • STX3-DEF: 80 - 250 gpm (303 - 946 L/min)
  • SX1-DEF: 2 - 10 gpm (8 - 38 L/min)

STX & STX-DEF Nominal Flow Rate Range

STX & STX-DEF Nominal Flow Rate Range


Pump Model L W H Approx. Wt.
70 lb
32 kg
STX3-DEF in 20-2/3 12-5/8 11-5/9 132 lb
mm 524.5 320.8 293.7 60 kg
SX1-DEF in 7-1/3 11-4/5 8-4/7 36 lb
mm 160.3 322.3 171.5 16 kg

Materials of Construction

Parts Materials
Cylinder, Heads, Relief Valve Cover (SXT models) 316 Stainless Steel: ASTM A743, CF-8M
Cylinder (SX1) 304 Stainless Steel
 Head (SX1) 316 Stainless Steel

Pump Options

Options Details
Orientation Options Right Hand: INLET is to the right, when looking from driven side
Porting Options STX-DEF: Top Outlet: Outlet 90° offset from inlet
SX1-DEF: Side Outlet: Outlet 180° inline porting
Connection Options STX3-DEF: 3-in. butt weld stainless steel 
STX2-DEF, STX1220A-DEF: 2-in. butt weld stainless steel
SX1-DEF: 1" NPT Tapped Ports (standard); 1" BSP Tapped Ports (available option)
Mounting Options Pump only
Unit: Pump, Motor, Baseplate, Couplings, Guards
Sealing Options Blackmer single mechanical seal

Vane Options

Temperature Limits Viscosity
Duravane  -25°F to 240°F (-32°C to 115°C) STX2A-DEF: 0.2 - 990 cP
STX1220A-DEF: 0.2 - 22 cP
STX3-DEF: 0.2 - 4,250 cP
SX1-DEF: 0.2 - 7 cP

Elastomer Options

Material Temperature Limits
PTFE - SS Spring -25°F to 240°F (-32°C to 115°C) 
SX1-DEF: Ethylene Propylene (EP) -25°F to 240°F (-32°C to 115°C)