NP Series Sliding Vane Pumps

The NP Series is part of Blackmer’s iron line of sliding vane pumps. They are designed for maximum versatility in handling clean, non-corrosive liquids in high-temperature, high-pressure, high-viscosity applications.

The NP pumps’ unique sliding vane rotor design provides sustained, high-level performance over a wide viscosity range. Their slow operating speeds and non-pulsating flow minimises shear and agitation of the fluid. Equipped with self-lubricating internal sleeve bearings, Blackmer NP pumps also offer maintenance-free performance.

Features & Benefits

Know more about the features & benefits of using NP Series Sliding Vane Pumps.

Ductile-iron construction with metallised carbon sleeve bearings and non-metallic vanes for longer life
Shaft stuffing box accommodates most standard aftermarket mechanical seal configurations
Pump design and operation minimises shear and agitation
Adjustable relief valve protects pump against excessive pressures
Excellent self-priming and dry-run capabilities
Sustained performance and trouble-free operation
High suction lift and line-stripping capabilities
Easy to maintain – low maintenance and life cycle costs

Available Options

We customise pumps according to your specific application. Get in touch with us to know your options.

Optional commercial mechanical seal with stainless steel, carbon, and PTFE construction
Jacketed pump head option for high-temperature operation
Vane material options
Sealing options
Elastomer options
Material options
Connection options
Porting options
Mounting/baseplates
Maintenance kits/spare parts

Key Specifications

Here are the key specifications of NP Series Sliding Vane Pumps.

Flow rates up to 1,985 L/min
Max differential pressures: 8.6 – 13.8 bar
Working pressures up to 15.5 bar
Max viscosities: 4,250 to 22, 000 Cp

Applications

Here is a list of industrial applications for which NP Series Sliding Vane Pumps are commonly utilized.

Refiled fuels
Greases
Solvents
Chocolate
Syrups
Molasses
Edible oils
Black liquor
Sodium silicate
Tallow
Wax
Glues
Adhesives
Creosote
Asphalt
Aqueous Film Forming Foam (AFFF)

Different options for a Peristaltic hose pumps tubing

Blackmer NP Sliding Vane Technical Data

    PUMP SIZE
    FLOW RATE RANGE
    WORKING PRESSURE
    VISCOSITY RANGE
(CLOSED ROTOR)
    VISCOSITY RANGE
(OPEN ROTOR)
    DIFFERENTIAL PRESSURE
(CLOSED ROTOR)
    DIFFERENTIAL PRESSURE
(OPEN ROTOR)
  


    1.5”
    8-178 L/min
    15.5 bar
    0.2-4,250 cP
    0.2-22,000 cP
    8.6 bar
    13.8 bar
  

    2”
    38-291 L/min
    15.5 bar
    0.2-4,250 cP
    0.2-22,000 cP
    8.6 bar
    13.8 bar
  

    2.5”
    76-515 L/min
    15.5 bar
    0.2-4,250 cP
    0.2-22,000 cP
    8.6 bar
    13.8 bar
  

    3”
    227-1045 L/min
    15.5 bar
    0.2-4,250 cP
    0.2-22,000 cP
    8.6 bar
    13.8 bar
  

    4”
    833-1985 L/min
    15.5 bar
    0.2-4,250 cP
    0.2-22,000 cP
    8.6 bar
    13.8 bar
  

PUMP SIZE	FLOW RATE RANGE	WORKING PRESSURE	VISCOSITY RANGE (CLOSED ROTOR)	VISCOSITY RANGE (OPEN ROTOR)	DIFFERENTIAL PRESSURE (CLOSED ROTOR)	DIFFERENTIAL PRESSURE (OPEN ROTOR)
1.5”	8-178 L/min	15.5 bar	0.2-4,250 cP	0.2-22,000 cP	8.6 bar	13.8 bar
2”	38-291 L/min	15.5 bar	0.2-4,250 cP	0.2-22,000 cP	8.6 bar	13.8 bar
2.5”	76-515 L/min	15.5 bar	0.2-4,250 cP	0.2-22,000 cP	8.6 bar	13.8 bar
3”	227-1045 L/min	15.5 bar	0.2-4,250 cP	0.2-22,000 cP	8.6 bar	13.8 bar
4”	833-1985 L/min	15.5 bar	0.2-4,250 cP	0.2-22,000 cP	8.6 bar	13.8 bar

PRINCIPLE OF OPERATION

Blackmer sliding vane pumps use a rotor with sliding vanes to draw liquid into the pump. This rotor is located close to the wall of the cam so that a crescent-shaped cavity is formed on the opposite wall. Each rotor slot contains a sliding vane. As the rotor rotates, centrifugal force, hydraulic pressure, and push rods work together to extend each vane to the casing wall. This creates an expanding cavity on the inlet side – creating a vacuum that pulls liquid into the pump. The liquid is trapped between the vanes and the casing wall. The rotor rotation moves the liquid cavities around to the outlet side of the pump. The vanes are forced back into their slots at the outlet side, decreasing the cavity size and forcing the liquid through the outlet port.