GNX Series Sliding Vane Pumps

Part of the Iron Line of sliding vane pumps, these Blackmer® pumps are the market’s only alignment-free, reduced-speed positive displacement pumps. They are suited for both portable and stationary applications. GNX Series pumps include the proven features of Blackmer legacy GX Series pumps but take them to the next level with the incorporation of a commercial-grade, single-stage gearbox. This innovative new gearbox fits between the motor and pump and is held in place by a permanent dowelled connection that creates a structural link between the high-speed and low-speed sides of the system. This results in a pump that will not need to be realigned either at initial installation or following a maintenance procedure, resulting in improved peace of mind for the operator. The pre-grouted GNX composite baseplate adds additional value to the pump, gearbox and motor setup by providing unmatched surface flatness, significant vibration damping, and reduced installation costs.

The GNX and GNXH Series pumps are designed to handle a wide range of non-corrosive, clean industrial liquids and petroleum products and are available in 2-, 2.5-, 3-, and 4-in sizes. The GNX Series pumps have a 90° porting orientation and the GNXH Series pumps have a 180° porting orientation.

Features and Benefits
  • Alignment-free, reduced-speed pumps
  • Robust commercial-grade gear reducer with expanded ratio options
  • Eliminates traditional couplings
  • Retained rotor between bearing design extends mechanical seal life
  • Compact footprint utilizing close coupled, inline design
  • Alignment free design reduces downtime and simplifies maintenance
  • Flexible porting – 90° and 180° options
  • Corrosion resistant composite baseplate with pre-grouted build, flatness of 0.002” per foot, and 24 times increased vibration damping of steel
  • 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
Application
NON-CORROSIVE, CLEAN INDUSTRIAL LIQUIDS
  • Fuel oils
  • Lube oils
  • Jet fuels
  • Gasoline
  • Edible oils
SOLVENTS & THINNERS
  • Esters
  • Ketones
  • Naphthas
  • Ethers
  • Amines
  • Aromatics
  • Alcohols
  • Terpenes
  • Glycols

Performance and Specifications

AVAILABLE MODELS
  • GNX2
  • GNX2.5
  • GNX3
  • GNX4
  • GNXH2
  • GNXH2.5
  • GNXH3
  • GNXH4
NOMINAL FLOW RATE RANGE
  • GNX2: 7 - 86 gpm (26 - 325 L/min)
  • GNX2.5: 12 - 155 gpm (45 - 587 L/min)
  • GNX3: 100 - 275 gpm (379 - 1,041 L/min)
  • GNX4: 250 - 500 gpm (946 - 1,893 L/min)
DIFFERENTIAL PRESSURE
  • 2" & 2.5": 125 psi (8.6 bar)
  • 3" & 4": 100 psi (6.9 bar)
MAXIMUM WORKING PRESSURE (MAWP)
  • 175 psi (12.1 bar)
VISCOSITY
  • 0.2 - 4,250 cP
TEMPERATURE
  • -25°F to 240°F (-32°C to 115°C)
MIN/MAX SPEED (RPM)
  • 2" & 2.5": 323 - 814 rpm
  • 3": 332 - 700 rpm
  • 4": 257 - 563 rpm
CONNECTION ORIENTATION
  • Side Inlet | Top Outlet (GNX)
  • Side Inlet | Side Outlet (GNXH)
VANE MATERIALS
  • Duravane
  • EC Laminate
  • EC Cast Iron
AVAILABLE CERTIFICATES
  • Hydrostatic Test
  • Performance Test
  • NPSH Test
  • Material (actual or typical)
  • Dimensional (pump only or unit)
PRIMARY MATERIALS OF CONSTRUCTION
  • Ductile Iron, Cast Iron
Model
Length
Weigth
Height
Approx W.

GNX2

GNX2.5

GNX3

GNX4

GNXH2

GNXH2.5

GNXH3

GNXH4

in
mm

in
mm

in
mm

in
mm

in
mm

in
mm

in
mm

in
mm

22-1/5
563.9

24
609.6

28
711.2

34-3/8
873.1

22-1/5
563.6

24
609.6

28
711.2

34-3/8
873.1

10-7/16
265.1

11-3/8
288.9

13-5/8
346.1

15-5/8
396.9

10-7/16
265.1

11-3/8
288.9

13-1/2
342.9

15-5/8
396.9

8-4/5
223.5

9-5/8
244.5

12-3/8
314.3

15-4/7
395.3

8-7/8
225.4

9-4/5
249.2

12-3/8
314.3

15-4/7
395.3

76 lb
34 kg

102 lb
46 kg

150 lb
68 kg

310 lb
141 kg

74 lb
34 kg

93 lb
42 kg

146 lb
66 kg

300 lb
136 kg

Part

Cylinder

Heads

 Relief Valve Cover

Bearing Covers

Locknut and Lockwasher

Rotor

Shaft

Relief Valve (R/V)

Relief Valve Cap

Material

Ductile Iron: ASTM 536
Cast Iron: ASTM 48

Ductile Iron: ASTM 536
Cast Iron: ASTM 48

Ductile Iron: ASTM 536
Cast Iron: ASTM 48

Steel
Cast Iron: ASTM 48

Steel

Ductile Iron: ASTM 536

High Strength Steel
High Strength Stainless Steel

Cast Iron: ASTM 48

Steel
Ductile Iron: ASTM 536

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