Product Description
Meaning of Model Code
Product Overview
The ZW series non-clogging self-priming sewage pump integrates self-priming and non-clogging discharge functions. By adopting an axial recirculation design and a uniquely engineered pump body and impeller flow passage, it operates like a standard self-priming clean-water pump without the need for a foot valve or priming water, while also being capable of suction and discharge of liquids containing large solid particles and long-fiber impurities without clogging. It is widely used in municipal sewage projects, pond and farm waste treatment, sediment and ore impurity handling, light industry, paper making, food processing, chemical engineering, pharmaceuticals, power plants, pulp, and various chemical mixtures — an ideal impurity-handling pump.
This pump features a simple structure, excellent self-priming performance (self-priming height up to 5 m), strong sewage handling capacity, high efficiency and energy-saving characteristics, convenient maintenance (fully replaceable for WQ/QW submersible sewage pumps), and broad market prospects in the sewage pump product line.
Product Features
1. Dual-vane impeller structure greatly improves the pump’s ability to pass solids.
2. Mechanical seal adopts a new friction pair and operates long-term in an oil chamber.
3. Compact overall structure, small size, low noise, easy maintenance, and convenient replacement.
4. Automatic control panel enables automatic start/stop according to liquid level changes, requiring no manual supervision.
5. Multiple installation methods available to meet user needs, making installation and maintenance extremely convenient without requiring personnel to enter the sewage pit.
6. Ensures the motor does not overload when used within the designed performance range.
Product Applications
The ZW series non-clogging self-priming sewage pump is suitable for discharging heavily polluted industrial wastewater, residential sewage stations, municipal sewage treatment discharge systems, civil defense drainage stations, water supply equipment for water plants, hospital and hotel sewage discharge, municipal engineering, construction sites, mining operations, rural biogas pits, farmland irrigation, and more.
It can transport sewage and wastewater containing solid particles and impurities, and can also be used for clean water and weakly corrosive media.
Operating Conditions
1. Ambient temperature ≤ 50℃; medium temperature ≤ 80℃ (up to 200℃ for special requirements).
2. Medium pH range: cast-iron pumps 6–9; stainless-steel pumps 2–13.
3. Medium density ≤ 1240 kg/m³.
4. Self-priming height must not exceed the specified 4.5–5.5 m; suction pipe length ≤ 10 m.
5. Passage capability: suspended particle diameter ≤ 60% of pump inlet diameter; fiber length ≤ 5× pump inlet diameter.
Structure and Working Principle
The ZW non-clogging self-priming sewage pump is mainly composed of a pump body, impeller, rear cover, mechanical seal, pump shaft, bearing housing, inlet valve, air–liquid separation pipe, filling valve, inlet and outlet connections, etc.
The pump structure is shown in the diagram.
Working principle:
Inside the pump body is a liquid storage chamber connected to the working chamber through an upper recirculation hole and a lower circulation hole, forming an axial-recirculation external-mixing system. After the pump stops, a certain amount of liquid remains stored in the chamber.
When the pump starts, the stored liquid is driven by the impeller, carrying air upward. The liquid flows back to the working chamber through the mesh of the air–liquid separation pipe, while the air is discharged outside the pump.
This creates a vacuum inside the pump, enabling the self-priming function.
Structural Diagram
 |
No.
|
Name
|
No.
|
Name
|
|
1
|
Inlet Pipe
|
9
|
Impeller
|
|
|
2
|
Inlet Flange
|
10
|
Mechanical Seal
|
|
|
3
|
Inlet Valve Seat
|
11
|
Water Ring
|
|
|
4
|
Filling Valve
|
12
|
Bearing Housing
|
|
|
5
|
Outlet Pipe
|
13
|
Pump Shaft
|
|
|
6
|
Pump Body
|
14
|
Bearing Cover
|
|
|
7
|
Air–Liquid Separation Pipe
|
15
|
Bottom Cover Plate
|
|
|
8
|
Rear Cover
|
16
|
Bolts
|
Structural Diagram
|
Model
|
Flow Rate (m³/h)
|
Head (m)
|
Motor Power (kW) |
Speed (rpm)
|
Power (kW)
|
NPSHr
|
|
(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)
|
Power (kW)
|
NPSHr
|
|
(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
|
OEM & Custom Solutions
We offer full OEM/ODM customization including stainless steel or cast-iron construction, special voltages (220V/415V/460V), explosion-proof motors, and extended suction configurations. Custom packaging, nameplate branding, and control panels are available. Each pump undergoes hydraulic testing to ensure ISO and CE compliance for export applications.
FAQs for Oversea Buyers
Q: What makes the ZW/ZWL pump different from other sewage pumps?
A: It combines self-priming and non-clogging capabilities, eliminating the need for bottom valves or priming before startup.
Q: What is the maximum self-priming height?
A: The pump can self-prime up to 5 meters and restart automatically after short downtime without refilling.
Q: Can it handle solids and fibers?
A: Yes, it can handle solids up to 60% of the outlet diameter and fibers up to five times the outlet diameter.
Q: What materials are available?
A: Standard models use cast iron; stainless steel and special alloy materials are available for corrosive media.
Q: Can the pump operate in chemical or food applications?
A: Yes, the stainless-steel version (ZWL) is ideal for chemical, food, and pharmaceutical industries.
Q: How often does it require maintenance?
A: Routine inspection every 500 hours is recommended; seals and bearings should be replaced as needed.
Q: What markets use this pump?
A: Widely exported to Southeast Asia, Africa, and South America for wastewater treatment, municipal drainage, and industrial slurry handling.