NP Series Sliding Vane Pumps

Specifically designed to offer maximum versatility for handling a wide variety of clean, non-corrosive liquids, the NP and NPH Series Sliding Vane Pumps (Iron Line) are general purpose positive displacement pumps ideal for applications where high temperature, high pressure, high viscosity, and/or shaft sealing requirements dictate a sleeve bearing pump. The Blackmer® unique sliding vane rotor design provides sustained, high level performance over a wide viscosity range, and slow operating speeds with non-pulsating flow minimize shear and agitation of the fluid. The unique head and bearing design is conducive to long bearing life: a small, continuous flow of fluid from the discharge side to the bearings creates a hydrodynamic film that minimizes temperature rise. These pumps are self-priming and dry-run capable due to self-adjusting vanes, making them ideal for priming and line stripping. High volumetric efficiency and symmetrical bearing support mean the NP/NPH Series pumps require less horsepower than other PD pumps, increasing efficiency and reducing operating costs. NP vs. NPH — which one do I need? Both series share the same internals, performance envelope, and options structure. The difference is the port layout: NP models (NP1.5B, NP2F, NP2.5F, NP3F, NP4F) have a side inlet with a top outlet offset 90° from the inlet, and are cast iron construction. NPH models (NPH2F, NPH2.5F, NPH3F, NPH4F) have a side inlet with a side outlet offset 180° from the inlet, and are ductile iron construction. Pick the model that matches the piping layout on your installation. Ductile-iron/cast-iron construction with metallized carbon sleeve bearings and non-metallic vanes for longer life Optional commercial mechanical seal with stainless steel, carbon, and PTFE construction Shaft stuffing box accommodates most standard aftermarket mechanical seal configurations Jacketed pump head option available for high temperature operation (call to order, see Configuration Options below) Pump design and operation minimizes shear and agitation Adjustable relief valve protects the pump against excessive pressures Common applications: refined fuels, greases, solvents, chocolate, syrups, molasses, edible oils, black liquor, sodium silicate, tallow, wax, glues, adhesives, creosote, asphalt, and Aqueous Film Forming Foam (AFFF). Dimensions Model L (in) W (in) H (in) Pump Weight (PSG dimensions table) Shipping Weight (used for freight) NP1.5B 15-3/4 10-9/16 8-1/2 47 lb 47 lb NP2F 16-1/2 8-3/4 8-11/16 65 lb 65 lb NP2.5F 19-1/8 10-11/16 9-5/8 92 lb 95 lb NP3F 19-1/8 13-7/16 12-1/4 134 lb 137 lb NP4F 26-1/8 16-15/16 15-1/2 314 lb 314 lb NPH2F 16-7/16 10 8-7/8 64 lb 65 lb NPH2.5F 19 11-1/16 9-13/16 92 lb 95 lb NPH3F 19-1/16 14-1/4 12-1/16 131 lb 137 lb NPH4F 26-1/8 17-7/8 15-1/2 296 lb 314 lb Pump Weight is Blackmer/PSG's published dimensions-table weight for the bare pump. Shipping Weight is the price sheet's shipping weight and is what freight/checkout uses for this listing; the two differ on several models, which is normal for this series. Configuration Options (call to order) The options below are available on every NP/NPH model but are not sold online due to Shopify's 3-option limit. Call (262) 646-4500 to add any of these to your order, or to confirm fitment before you order. Category Options Notes Vane Material Duravane® (standard), Laminate, Bronze, Iron (all extra-clearance vanes, priced per model) Chemical-compatibility decision, best confirmed against your Seal selection. Rotation Open Rotor Right-hand (standard), Open Rotor Left-hand, Closed Rotor Right-hand, Closed Rotor Left-hand Closed Rotor not offered on NP1.5B. Relief Valve Iron (standard), Corrosion Resistant — Relief Valve Spring Steel springs (multiple PSI ranges, standard range is $0), Stainless Steel springs (priced) Call to specify your required pressure range. O-Ring / Elastomer FKM (standard), PTFE, Buna-N — Cylinder Drain Standard, without drain (standard), Cast/Ductile Iron with SAE bottom drain — Jacketed Heads No Jacketed Heads (standard), Jacketed Heads w/ NPT connections, Jacketed Head (NPT) Inboard Only, Heads equipped for Electric Heating Not cost-neutral — adds $377–$3,005 depending on model, and increases shipping weight by 6–28 lb over the standard (non-jacketed) weight shown above. Max jacket coolant pressure 150 psi (coolant connections 3/4" NPT, 3/8" NPT on NP1.5B). Electric Heating Package PTFE Packing (G3) + Stainless Steel RV Spring (G or J) + Electric Heating Heads (3) Must be ordered together as a group per Blackmer — not offered as a standalone Seal option online for that reason. Includes high-temperature paint, special bushings, and bearing cover; heating cartridges not included. Accessories Standard only on this sheet — Maintenance Kits Model(s) Kit Part Number NP1.5B 898928 NP2F, NPH2F 898929 NP2.5F, NPH2.5F 898930 NP3F, NPH3F 898931 NP4F, NPH4F 898932 Literature Installation Operation Manual (IOM) – NP Series 103-A00 Materials of Construction – 103-091 Product Brochure – NP Series 103-001 ATEX Declaration of Conformity (Addendum to the IOM) – Form 617 Performance Curves – NP1.5 Performance Curves – NP2, NPH2 Performance Curves – NP2.5, NPH2.5 Performance Curves – NP3, NPH3 Performance Curves – NP4, NPH4 OEM by Blackmer PSG Dover is provided by KI Pumps of Waukesha, WI, recognized globally as a leading supplier of positive displacement and sliding vane pumps and their components.