ALLWEILER NB Series Horizontal Volute Centrifugal Pump
ALLWEILER NB Series Horizontal Volute Centrifugal Pump
ALLWEILER NB Series Horizontal Volute Centrifugal Pumps | A Reliable Choice for General Fluid Transfer
Product Overview
The NB series is a classic horizontal volute centrifugal pump from the German company ALLWEILER. It features a
direct-coupled block design and meets DIN EN 733 standards. This series is renowned for its compact structure,
reliable operation, and easy maintenance, making it an economical solution for fluid transfer in industrial and civil applications.
ALLWEILER, a German pump brand with over 150 years of history (now part of the CIRCOR Group), offers a wide range
of centrifugal pumps. The NB series is specifically designed for clean or lightly contaminated non-corrosive liquids and
is suitable for various applications including cooling and heating circulation systems, water supply and treatment, air
conditioning and refrigeration, and industrial processes.
Differences from the NTT series: The NB series is a general-purpose clean water centrifugal pump with a maximum
temperature resistance of 140°C and a pressure rating of PN10/16; while the NTT series is a dedicated heat transfer
oil pump with a maximum temperature resistance of 350°C, suitable for high-temperature heat transfer media circulation.
ALLWEILER NB Series Horizontal Volute Centrifugal Pump Model Description
The NB series adopts the German standard naming convention. Please refer to the following typical model interpretations:
Model Example | Meaning
NB 32-160 | Discharge port diameter DN32, impeller nominal diameter 160mm
NB 50-200 | Discharge port diameter DN50, impeller nominal diameter 200mm
NB 65-250 | Discharge port diameter DN65, impeller nominal diameter 250mm
Complete Model Example: NB50-200U3D-W135-42/350
Code Location | Meaning
NB | Pump Series Code
50 | Discharge port diameter DN 50 (mm)
200 | Impeller nominal diameter (mm)
U3D | Seal Code
W135 | Material Code
42/350 | Other Configuration Parameters
Available Specifications (Partial List):
Model | Discharge Port Diameter DN | Impeller Diameter (mm)
NB 32-160 | 32 | 160
NB 40-160 40 160
NB 50-160 50 160
NB 50-200 50 200
NB 65-160 65 160
NB 65-200 65 200
NB 65-250 65 250
NB 80-200 80 200
NB 80-250 80 250
NB 100-160 100 160
NB 100-200 100 200
NB 100-250 100 250
ALLWEILER NB Series Horizontal Volute Centrifugal Pump Core Technical Parameters
Parameter Item Specification Range
Maximum Flow Rate 480 m³/h
Maximum Head 145 m
Maximum Outlet Pressure 10 / 16 bar (PN10 / PN16)
Maximum Medium Temperature 140 °C
Minimum Medium Temperature Approx. -10 °C (depending on sealing material)
Speed 2900 rpm / 1450 rpm (optional)
Connection Method Flange connection (DIN standard)
Installation Method Horizontal / Vertical (optional)
Design Standard DIN EN 733
Note: The NB series features a direct-drive block design. The motor is directly mounted on the pump body via
a flange or lantern bracket, eliminating the need for couplings and a common base, resulting in a compact structure.
ALLWEILER NB Series Horizontal Volute Centrifugal Pump Product Features and Design Advantages
1. Direct-drive Block Design, Compact Structure
The NB series adopts a direct-drive block design, where the motor connects directly to the pump body, eliminating the
need for couplings and a common base. This results in a smaller footprint, lighter weight, and easier installation.
2. Compliant with DIN EN 733 Standard
Performance parameters and structural dimensions comply with DIN EN 733 standard (formerly DIN 24255), offering
excellent interchangeability with mainstream pump models on the market.
3. Flexible Installation Options
Supports both horizontal and vertical installation, allowing for flexible selection based on site space.
4. Wide Range of Applicable Media
Can transport a variety of media, including pure water, industrial water, seawater, condensate, oils, brine, alkali solutions,
and hot water.
5. Easy Maintenance
The back-pull design allows for removal of rotating parts without disassembling the pump casing.
Standardized support feet facilitate installation and adjustment.
Some models are available in a two-stage pump configuration to meet higher head requirements.
6. Flexible Configuration
Optional ATEX explosion-proof type (suitable for hazardous areas).
IEC standard motors can be used, facilitating spare parts procurement.
A variety of material combinations are available to adapt to different media.
ALLWEILER NB Series Horizontal Volute Centrifugal Pump Core Application Areas
NB series centrifugal pumps are widely used in the following industries and scenarios:
Application Areas Typical Scenarios
Cooling and Heating Circulation
Cooling water circulation, heating systems, heat recovery
Water Supply and Treatment
Water supply systems, water treatment, seawater desalination
Air Conditioning and Refrigeration
Central air conditioning water systems, cooling tower circulation
Industrial Technology
Dust removal spraying, spraying equipment, industrial processes
Swimming Pools and Irrigation
Swimming pool circulation, agricultural irrigation
Fire Protection Water Supply
Fire protection system water supply (must comply with fire protection regulations)
ALLWEILER NB Series Horizontal Volute Centrifugal Pump Applicable Media:
Pure water, industrial water, seawater, condensate, oil, brine, alkali, hot water (maximum 140°C)
Installation and Maintenance Guide:
Installation Precautions:
Foundation Preparation: The pump set should be installed on a level, clean foundation. B25 strength grade concrete
foundation is recommended.
Leveling: After installation, check the pump set's levelness. The allowable tilt is ≤1 mm/m.
Pipeline Cleaning: Thoroughly clean the inside of the pipeline before installation to prevent impurities from entering the pump body.
Pipeline Support: Independent supports should be installed for the inlet and outlet pipelines to prevent the weight of
the pipeline from acting on the pump body flange.
Insulation Considerations: If pump insulation is required, only the volute casing should be insulated to prevent motor overheating.
Maintenance Recommendations:
Regular Inspection: Check for leaks in the mechanical seal and abnormal noise from the bearings.
Freeze Protection: When the pump is not in use during winter, drain the medium from the pump to prevent freezing and cracking.
Corrosion Inspection: Regularly check the condition of the anti-corrosion coating and treat rust promptly.
Standby Pump Maintenance: The standby pump should be rotated periodically to prevent jamming.
ALLWEILER NB Series Horizontal Volute Centrifugal Pump Product Advantages Summary
Advantages Explanation
✅ German Quality: 150+ years of pump industry technology accumulation, original German design
✅ Compact Structure: Direct-drive block design, saving installation space
✅ Flexible Installation: Supports both horizontal and vertical installation methods
✅ Wide Media Applicability: Suitable for various media including clean water, industrial water, seawater, oil, and alkaline solutions
✅ Compliant with International Standard DIN EN 733, with interchangeability
✅ Convenient Maintenance: Back-pull design, maintenance without disassembling the pump casing
✅ Flexible Configuration: Optional ATEX explosion-proof, multiple material options
✅ Complete Diameter Range: DN 32 – DN 100 (Full Coverage)
ALLWEILER NB Series Horizontal Volute Centrifugal Pump Selection Recommendations
Please select the model based on the following operating parameters:
Media Type: Clean Water / Industrial Water / Seawater / Oil / Alkaline Solution / Other
Operating Temperature: Maximum/Minimum Temperature (°C)
Operating Pressure: Maximum System Pressure (bar)
Flow Rate Requirement: Rated Flow Rate (m³/h)
Head Requirement: Total Head Required (m)
Installation Method: Horizontal / Vertical
Special Requirements: Explosion-proof (ATEX) Required?
Why Choose Us?
First-hand Source: 100% Genuine ALLWEILER Products from Germany
In Stock: Commonly Used Specifications in Stock for Fast Delivery
Full Model Coverage: DN 32 – DN 100 Full Range of Specifications
Fast Delivery: Standard Specifications in Stock for Fast Shipping
Professional Technical Support: Provides Selection Guidance, Installation, Commissioning, and After-sales Service
Original Warranty: 1-Year Warranty under Normal Use
Important Note: This product is a genuine ALLWEILER product from Germany. Please look for the brand logo. Using non-original
substitutes may result in substandard performance, seal failure, and other safety hazards.
