ZW/ZWP/ZWPB/ZWB Non-Clogging Self-Priming Sewage Pump

ZW/ZWP/ZWPB/ZWB Non-Clogging Self-Priming Sewage Pump

ZW/ZWP/ZWPB/ZWB Self-Priming Sewage Pump | Non-clog solids transfer

  • Self-priming: Suction-lift duty, no foot valve.
  • Non-clog hydraulics: Solids/fiber handling.
  • Wastewater sealing: Protected mechanical seal.
  • Easy maintenance: Compact, service-friendly.
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Product Overview 

The ZW Non-Clogging Self-Priming Sewage Pump integrates self-priming functionality and non-clogging wastewater handling performance, specifically designed for surface installation.
With specially designed pump casing and impeller flow paths, the pump operates like a standard self-priming clean water pump, without the need for foot valves or manual startup. It reliably transports liquids containing large solid particles and long fibrous impurities.
It is widely used in municipal and industrial wastewater treatment, and serves as an effective alternative to submersible sewage pumps.

Model Designation

ZWZWPZWPBZWB Non Clogging Self Priming Sewage Pump typeKey Features 

  • Powerful Self-Priming Capability: No foot valve required, simplifying the system design and improving self-priming efficiency.

  • Compact Design: Saves space, easy to install and maintain, and structurally reliable.

  • High Efficiency & Long Lifespan: Efficient operation, adaptable to complex operational environments, with durability for long-term use.

  • Wide Applicability: Suitable for various wastewater applications, including those with large solid particles and long fibrous impurities.

Engineering Summary 

The ZW pump features an internal liquid storage chamber combined with a gas-liquid separation structure.
After shutdown, a certain volume of liquid remains in the pump casing. Upon startup, the stored liquid mixes with air entering the aerator, the gas-liquid mixture is separated, air is discharged, and a vacuum is formed inside the pump chamber, completing the self-priming process.
This design ensures stable self-priming performance and robust solid handling capacity, enabling continuous operation under complex conditions.

Typical Applications 

The ZW series pump is widely used in:

  • Municipal sewage treatment projects and sewage treatment plants

  • Industrial and commercial wastewater discharge systems

  • Hospital, hotel, and urban household sewage discharge

  • Construction sites, mines, and sediment impurity treatment

  • Rural biogas pits, agricultural irrigation, and aquaculture facilities

The pump is capable of handling wastewater containing particles, sludge, and mildly corrosive media, and is also suitable for clean water and weakly corrosive liquids.

System Configuration

The ZW Non-Clogging Self-Priming Pump primarily consists of:

  • Suction Chamber

  • Liquid Storage Chamber

  • Pump Casing and Recirculation Channel

  • Gas-Liquid Separation Chamber

  • Conveyance Unit Assembly

  • Bearing Casing and Sealing Components

  • (Optional) Bearing Cooling Chamber

Components and Supply

The pump components are made from corrosion-resistant, high-strength materials to ensure long-term stable operation.
Major components include:

  • Pump Casing: Made of cast iron or stainless steel, offering excellent corrosion resistance and pressure performance.

  • Impeller: Optimized design to ensure fluid passage capability and self-priming performance.

  • Bearing System: Provides stable support, maintaining high efficiency after extended operation.

  • Sealing System: Features a dual-seal design to effectively prevent liquid leakage from high-pressure areas to low-pressure areas.

Technical Service 

The ZW Self-Priming Pump provides comprehensive technical support and services, including:

  • Installation Guidance: Detailed installation manuals and on-site support.

  • Maintenance and Repairs: Regular maintenance and repair services to ensure efficient pump operation.

  • Technical Assistance: 24/7 technical support to resolve operational issues.

Operating Conditions

  • A fixed volume of liquid must be retained in the pump casing before startup to ensure self-priming.

  • The fluid being transported may contain small solids (≤30%).

  • Maximum allowable viscosity: ≤100 cP.

  • Bearing temperature should be monitored during continuous operation to ensure it remains within a safe range.

  • Suitable for general industrial and agricultural water or similar media.

Service Conditions

The ZW Self-Priming Pump performs well in fluctuating operational environments and adapts to varying conditions.

  • Operating Ambient Temperature: Suitable for a wide range of operational environments.

  • Humidity Tolerance: Suitable for high humidity environments, with moisture-resistant pump and motor designs.

  • Flow and Pressure Fluctuations: The pump remains stable under varying flow and pressure conditions.

Protection Features

The ZW Self-Priming Pump is equipped with a comprehensive protection system, including:

  • Overload Protection: Prevents the pump from operating under excessive loads, protecting the equipment.

  • Overheat Protection: Automatically shuts down the pump if the temperature exceeds the set limit.

  • Dry-Run Protection: The system automatically shuts down if the pump fails to prime due to insufficient liquid.

Selection Criteria 

When selecting the ZW Self-Priming Pump, consider the following factors:

  • Flow Requirements: Determine the required flow range based on the actual application.

  • Type of Media: Select the appropriate pump materials to handle different chemical media.

  • Operating Pressure: Ensure the pump’s maximum working pressure meets system requirements.

  • Operating Environment: Consider the impact of ambient temperature, humidity, and other external factors on pump performance.

Specifications & Installation

Outline Drawing

ZW Non-Clogging Self-Priming Sewage Pump

Performance Data

No.
Name
Serial No.
Name
1
Inlet Connection
9
Impeller
2
Inlet Flange
10
Mechanical Seal
3
Inlet Valve Seat
11
Water Seal
4
Water Filling Valve
12
Bearing Seat
5
Outlet Connection
13
Pump Shaft
6
Pump Body
14
Bearing Cover
7
Gas-Liquid Separation Pipe
15
Bottom Cover Plate
8
Rear Cover
16
Bolts

Performance Parameters

Model
Flow Rate (m³/h)
Head (m)
Motor Power (kW)
Speed (rpm)
Efficiency (%)
NPSHr (m)
(m3/h)
(M)
(kw)
(r/min)
(%)
(M)
ZW25-8-15
8
15
2.2
2900
45
2
ZW32-10-20
10
20
2.2
2900
45
2.5
ZW40-20-15
20
15
2.2
2900
45
2.5
ZW40-15-30
15
30
3
2900
48
2.5
ZW50-10-20
10
20
2.2
2900
45
2.5
ZW50-20-15
20
15
2.2
2900
45
2.5
ZW50-18-22
18
22
3
2900
48
2.5
ZW50-15-30
15
30
3
2900
48
2.5
ZW65-30-18
30
18
4
2900
45
2.5
ZW65-20-30
20
30
5.5
2900
45
2.5
ZW65-25-40
25
40
7.5
2900
50
3
ZW80-40-16
40
16
4
1450
50
3
ZW80-65-25
65
25
7.5
2900
50
3
ZW80-80-35
80
35
15
2900
45
3
ZW80-50-60
50
60
22
2900
55
3
ZW80-80-45
80
45
22
2900
55
3
Model
Flow Rate (m³/h)
Head (m)
Motor Power (kW)
Speed (rpm)
Efficiency (%)
NPSHr (m)
(m3/h)
(M)
(kw)
(r/min)
(%)
(M)
ZW100-80-20
80
20
7.5
1450
53
4
ZW100-100-15
100
15
7.5
1450
50
4
ZW100-100-20
100
20
11
1450
53
4
ZW100-100-30
100
30
22
2900
53
4
ZW100-80-45
80
45
30
2900
55
4
ZW100-80-60
80
60
37
290
53
4
ZW100-80-80
80
80
45
2900
50
4
ZW125-120-20
120
20
15
1450
55
4.5
ZW150-200-15
200
15
15
1450
60
5
ZW150-200-20
200
20
22
1450
60
5
ZW150-200-28
200
28
30
1450
65
5
ZW150-400-25
400
25
55
1450
45
5
ZW150-180-40
180
40
55
1450
65
5
ZW200-280-12
280
12
22
1450
62
5
ZW200-300-18
300
18
37
1450
59
5
ZW200-300-25
300
25
45
1450
55
5
ZW200-280-28
280
28
55
1450
61
5
ZW250-400-22
400
22
55
1450
65
5
ZW300-800-14
800
14
55
1450
61
5

Operating Manual

Pre-Start Inspection

  • Check if the pump base, bearing housing, bearing seat, and other connection points are securely fastened. If any parts are loose, tighten them.

  • Manually rotate the coupling to check for any jamming or unusual noise.

  • Open the water inlet valve on the top of the pump and fill the liquid chamber with water to at least two-thirds of the pump’s volume, then close the valve. No further priming will be required once the pump starts.

  • Connect the power supply and briefly test the rotation. From the motor end, check that the rotation is clockwise (reversing direction is strictly prohibited).

  • Start the pump and observe its operation. If any abnormal phenomena occur, identify and resolve the issue.

OEM & Custom

Supports OEM/ODM, customized materials, corrosion-resistant structures, voltage customization, flange standards, private label and export packaging solutions.

FAQs

  1. 1. Can the pump pass solid particles?
    Yes. It handles solids depending on the inlet diameter.
  2. 2. Does the pump require a bottom valve?
    No. It features true self-priming without bottom valves.
  3. 3. Can it handle slurry or fibrous waste?
    Yes. Designed for slurry, fibers, and mixed wastewater.
  4. 4. What is the allowable medium temperature?
    0–80°C under normal operating conditions.
  5. 5. Is maintenance complicated?
    No. The pump has a simple, robust structure.
  6. 6. What is the delivery time?
    Usually 7–15 days depending on quantity.
  7. 7. Are spare parts available?
    Yes. Impellers, seals, plates, shafts and bases are available.