GNX Series Sliding Vane Pumps

The Blackmer GNX Series is a line of alignment-free, reduced-speed sliding vane pumps for non-corrosive, clean industrial liquids and petroleum products, available in 2, 2.5, 3, and 4 inch sizes with a 90 degree porting orientation. A commercial-grade, single-stage gear reducer fits between the motor and pump and is held in place by a permanent dowelled connection, creating a structural link between the high-speed and low-speed sides of the system so the pump never needs realignment, either at initial installation or after a maintenance procedure. The optional pre-grouted composite baseplate adds a surface flatness of 0.002 inch per foot and roughly 24 times the vibration damping of a steel baseplate. GNX Series pumps carry forward the proven features of Blackmer's legacy GX Series. A companion line, the GNXH Series, uses the same pump but with 180 degree inline porting instead of the 90 degree offset porting used here; GNXH models are priced on a separate sheet and listed on their own product page. Choose Your Model GNX2A The GNX2A is the smallest model in the series, a 2 inch pump rated for a nominal flow of 7 to 86 gpm (26 to 325 L/min). It ships at approximately 88 lb, pump only, less gear reducer. Seal type and flange connection are both selectable above; other options ship in Blackmer's standard configuration unless you call in. GNX2.5A The GNX2.5A is the 2.5 inch model, rated for a nominal flow of 12 to 155 gpm (45 to 587 L/min). It ships at approximately 102 lb, pump only, less gear reducer. Seal type and flange connection are both selectable above. GNX3A The GNX3A is the 3 inch model, rated for a nominal flow of 100 to 275 gpm (379 to 1,041 L/min). It ships at approximately 178 lb, pump only, less gear reducer. Seal type and flange connection are both selectable above. GNX4A The GNX4A is the largest and highest capacity model in the series, a 4 inch pump rated for a nominal flow of 250 to 500 gpm (946 to 1,893 L/min). It ships at approximately 310 lb, pump only, less gear reducer. Seal type and flange connection are both selectable above. Configuration Options Seal type and flange connection are selectable right on this page using the dropdowns above; any change to the base list price shows automatically. Vane material, rotation, relief valve type, relief valve spring range, and O-ring elastomer are not selectable online because of catalog system limits and Shopify's 3-option cap; every pump ships in Blackmer's standard configuration for those unless you call us at (262) 646-4500 with the code you need and we will quote and build the order for you. Option Code GNX2A GNX2.5A GNX3A GNX4A Vane: Duravane, standard 4 Std Std Std Std Vane: Laminate (extra clearance) 6 +$327 +$509 +$545 +$1,130 Vane: Iron (extra clearance) 9 N/A +$437 +$437 +$437 Rotation: Right-hand (CW), standard 1R Std Std Std Std Rotation: Left-hand (CCW) 1L $0 $0 $0 $0 Relief Valve: Iron, standard 1 Std Std Std Std Relief Valve: Corrosion Resistant 2 +$115 +$115 +$148 +$242 O-Ring: Fluorocarbon (FKM), standard 2 Std Std Std Std O-Ring: PTFE 3 +$274 +$274 +$352 +$548 O-Ring: Buna-N 1 $0 $0 $0 $0 Relief valve spring range is a no-cost option that ships in Blackmer's standard range for each model unless a different range is called in: GNX2A standard is 51-75 psi, GNX2.5A standard is 51-110 psi, GNX3A standard is 51-110 psi, GNX4A standard is 51-75 psi. Other ranges are available per model per the Blackmer price sheet; note the 41-50 psi range on GNX2.5A is not available together with the Corrosion Resistant relief valve. Seal choices, selectable in the dropdown above: Option Code GNX2A GNX2.5A GNX3A GNX4A Seal: Iron/FKM/Carbon/FKM (IVCV), standard C0 Std Std Std Std Seal: Iron/PTFE/Carbon/PTFE (IACT) AZ +$95 +$95 +$106 +$230 Seal: SS/PTFE/Carbon/PTFE (WACT) WA +$582 +$582 +$667 +$1,030 Seal: Iron/Buna/Carbon/Buna (INCN) A0 $0 $0 $0 $0 Flange choices, selectable in the dropdown above: Option Code GNX2A GNX2.5A GNX3A GNX4A Flange: NPT, standard N 2 in, Std 2.5 in, Std 3 in, Std 4 in, Std Flange: Weld W +$74 +$74 +$74 +$838 Flange: ANSI A +$327 +$509 +$509 +$509 Flange: Gasket and capscrews only, NPT C $0 $0 $0 $0 Flange: Gasket and capscrews only, Weld B $0 $0 $0 $0 Flange: No flanges, capscrews, or gaskets X $0 $0 $0 $0 Gear Reducers and Complete Unit Assemblies Every price above is for the base pump only, less gear reducer. Blackmer offers the GNX2A/GNX2.5A gear reducer in a Frame 7 size with 7 ratios (2.15:1 to 5.41:1) and multiple motor frame options from $2,395; the GNX3A reducer is a Frame 8 size with 8 ratios (2.14:1 to 7.18:1) from $2,875 to $3,280; and the GNX4A reducer is a Frame 9 size with 9 ratios (2.86:1 to 6.82:1) from $4,760 to $5,000, all added to the pump price. Complete base-mounted unit assemblies (pump, gear reducer, motor, and either a Bent Steel or BaseTek composite baseplate) are also available, priced by motor frame size from roughly $1,770 to $4,920 in addition to the pump and gear reducer. This is dozens of ratio, motor frame, and baseplate combinations per model, too many to list as web options; call us at (262) 646-4500 with your ratio and motor frame requirements and we will quote the complete assembly. Features and Benefits Alignment-free, reduced-speed pump design that eliminates traditional couplings Robust commercial-grade gear reducer with expanded ratio options Retained rotor between bearing design extends mechanical seal life Compact footprint utilizing a close coupled, inline design Alignment-free design reduces downtime and simplifies maintenance Corrosion resistant composite baseplate available, with a flatness of 0.002 inch per foot and roughly 24 times the vibration damping of steel Sliding-vane design self-adjusts for wear to maintain flow rates over the life of the pump Excellent self-priming and dry-run capability High suction lift and line-stripping capability Vanes can be replaced without removing the pump from the piping system, keeping maintenance simple and life-cycle costs low Applications GNX Series pumps are used to transfer non-corrosive, clean industrial liquids and petroleum products, including fuel oils, lube oils, jet fuels, gasoline, and edible oils, along with solvents and thinners such as esters, ketones, naphthas, ethers, amines, aromatics, alcohols, terpenes, and glycols. Performance and Specifications Specification Detail Nominal Flow Rate Range GNX2A: 7-86 gpm (26-325 L/min) GNX2.5A: 12-155 gpm (45-587 L/min) GNX3A: 100-275 gpm (379-1,041 L/min) GNX4A: 250-500 gpm (946-1,893 L/min) Differential Pressure GNX2A, GNX2.5A: 125 psi (8.6 bar) GNX3A, GNX4A: 100 psi (6.9 bar) Maximum Working Pressure 175 psi (12.1 bar) Min/Max Speed GNX2A, GNX2.5A: 323-814 rpm GNX3A: 332-700 rpm GNX4A: 257-563 rpm Viscosity Range 0.2-4,250 cP Temperature Range -25°F to 240°F (-32°C to 115°C) Primary Materials Ductile Iron, Cast Iron Connection Orientation Side Inlet / Top Outlet, 90° offset (GNXH Series offers Side Inlet / Side Outlet, 180° inline instead) Vane Material Duravane, standard (EC Laminate and EC Cast Iron available, see Configuration Options) Dimensions Dimensions and pump weight below are for the pump only, as listed on Blackmer's dimensional drawings. Shipping weights are listed under each model in the Choose Your Model section above and should be used for freight purposes; the two figures should never be mixed. Model L W H Pump Weight GNX2A 22-1/5 in (563.9 mm) 10-7/16 in (265.1 mm) 8-4/5 in (223.5 mm) 76 lb (34 kg) GNX2.5A 24 in (609.6 mm) 11-3/8 in (288.9 mm) 9-5/8 in (244.5 mm) 102 lb (46 kg) GNX3A 28 in (711.2 mm) 13-5/8 in (346.1 mm) 12-3/8 in (314.3 mm) 150 lb (68 kg) GNX4A 34-3/8 in (873.1 mm) 15-5/8 in (396.9 mm) 15-4/7 in (395.3 mm) 310 lb (141 kg) Materials of Construction Component GNX2A, GNX2.5A, GNX3A GNX4A Cylinder Cast Iron (ASTM 48) Ductile Iron (ASTM 536) Heads, outboard Cast Iron (ASTM 48) Ductile Iron (ASTM 536) Heads, inboard Cast Iron (ASTM 48) Cast Iron (ASTM 48) Relief Valve Cover Cast Iron (ASTM 48) Ductile Iron (ASTM 536) Bearing Covers Steel Cast Iron (ASTM 48) Locknut, Lock Washer Steel — (not used on this model) Rotor Ductile Iron (ASTM 536) Ductile Iron (ASTM 536) Shaft High Strength Steel High Strength Stainless Steel Relief Valve Cast Iron (ASTM 48) Cast Iron (ASTM 48) Relief Valve Cap Steel Ductile Iron (ASTM 536) Vanes Duravane Duravane Maintenance and Rebuild Kits GNX2A 898908 - Maintenance Kit GNX2.5A 898909 - Maintenance Kit Need a different part? Call us at (262) 646-4500 and we will look it up by serial number. Manufacturer Literature Installation Manuals IOM Blackmer GNX & GNXH Series Sliding Vane Pumps 101-C00 Parts Lists Parts List GNX2A, GNXH2A 101-C01 Parts List GNX2.5A, GNXH2.5A 101-C02 Parts List GNX(H)3 101-C03 Parts List GNX(H)4 101-C04 Brochures Brochure Blackmer GNX Series 101-007 Brochure Blackmer GNX Series 101-007 (A4) Materials of Construction MOC Blackmer GNX & GNXH Series Sliding Vane Pumps 101-096 Dimensions Dimensions Blackmer Pump Model GNX2 101-205 Dimensions Blackmer Pump Model GNX2.5 101-206 Dimensions Blackmer Pump Model GNX3 101-207 Dimensions Blackmer Pump Model GNX4 101-208 Performance Curves Curves Blackmer GNX2, GNXH2 101-035 Curves Blackmer GNX2.5, GNXH2.5 101-037 Curves Blackmer GNX3, GNXH3 101-039 Curves Blackmer GNX4, GNXH4 101-041 Certifications Certification - ATEX Declaration of Conformity for Blackmer Vane Pumps (Addendum to IOM) FORM 617 OEM by Blackmer PSG Dover is provided by KI Pumps & Systems, Inc. of Waukesha, WI, recognized globally as a leading supplier of positive displacement and sliding vane pumps and their components.