Product Description
Product Overview
Product Description
The ZWL Series Direct-Coupled Self-Priming Non-Clog Sewage Pump integrates self-priming and non-clogging functions in one unit. Designed with an axial recirculation system and a specially engineered pump body and impeller passage, it operates like a standard clear-water self-priming pump without the need for a bottom valve or priming water, while also capable of handling liquids containing large solid particles and long-fiber impurities.
It is widely used in municipal sewage projects, river and pond farming waste treatment, sediment and mining residue transfer, light industry, paper-making, food processing, chemical industry, pharmaceuticals, power plants, slurry and mixtures, and other industrial wastewater applications.
This pump features simple structure, excellent self-priming performance (self-priming height up to 5m), strong sewage-handling capability, high efficiency, energy saving, and easy maintenance (a complete replacement for WQ/QW submersible sewage pumps). It has great market potential within the sewage pump category.
Product Features
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Dual-vane impeller design greatly improves the ability to pass solids.
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Mechanical seal adopts a new wear-resistant pair and operates continuously in an oil chamber.
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Compact structure, small size, low noise, and convenient maintenance for easy part replacement.
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Automatic control panel can start and stop the pump based on liquid level changes—no need for manual supervision.
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Various installation options are available; users do not need to enter the sewage pit during installation or maintenance.
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Operates within the designed performance range without overloading the motor.
Product Applications
The ZWL Series Direct-Coupled Self-Priming Non-Clog Sewage Pump is suitable for pumping sewage with solids in:
• Industrial and commercial wastewater discharge
• Residential sewage lifting stations
• Municipal sewage treatment plant discharge systems
• Civil defense drainage stations
• Water supply installations of waterworks
• Hospital and hotel sewage discharge
• Construction sites and municipal engineering
• Mining auxiliary drainage
• Rural biogas tanks and farmland irrigation
It can deliver sewage, wastewater with particles, sludge, and can also handle clean water or weakly corrosive liquids.
Operating Conditions
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Ambient temperature ≤ 50°C; medium temperature ≤ 80°C (up to 200°C available upon request).
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pH range: cast iron 6–9; stainless steel 2–13.
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Medium density ≤ 1240 kg/m³.
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Self-priming height must not exceed 4.5–5.5 m; suction pipe length ≤ 10 m.
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Passage capability: suspended solids ≤ 60% of pump inlet diameter; fiber length ≤ 5× inlet diameter.
Structure & Working Principle
The ZWL Series Direct-Coupled Self-Priming Non-Clog Sewage Pump consists of pump body, impeller, rear cover, mechanical seal, pump shaft, bearing seat, inlet valve, air-liquid separation pipe, priming valve, suction and discharge ports, etc. (See structural diagram.)
Working Principle:
The pump body contains a liquid-storage chamber connected to the pump chamber through an upper recirculation port and a lower circulation port, forming an axial recirculation external-mixing system.
After shutdown, a certain volume of liquid remains inside the pump.
When started, the stored liquid—driven by the impeller—mixes with the incoming air and is thrown upward. Liquid returns to the working chamber through the mesh of the gas-liquid separation pipe, while air is expelled from the pump, creating a vacuum and achieving self-priming.
Structure Diagram
|
No.
|
Name
|
No.
|
Name
|
|
1
|
Inlet Pipe
|
9
|
Impeller
|
|
2
|
Inlet Flange
|
10
|
Mechanical Seal
|
|
3
|
Inlet Valve Seat
|
11
|
Water Blocking Ring
|
|
4
|
Priming Valve
|
12
|
Bearing Seat
|
|
5
|
Outlet Pipe
|
13
|
Pump Shaft
|
|
6
|
Pump Body
|
14
|
Bearing Cover
|
|
7
|
Air-Liquid Separator Tube
|
15
|
Bottom Cover Plate
|
|
8
|
Rear Cover
|
16
|
Bolt
|
Performance Parameters
|
Model
|
Flow Rate (m³/h)
|
Head (m)
|
Motor Power (kW)
|
Speed (rpm)
|
Efficiency (%)
|
NPSHr (m)
|
|
(m3/h)
|
(M)
|
(kw)
|
(r/min)
|
(%)
|
(M)
|
|
|
ZWL25-8-15
|
8
|
15
|
2.2
|
2900
|
45
|
2
|
|
ZWL32-10-20
|
10
|
20
|
2.2
|
2900
|
45
|
2.5
|
|
ZWL40-20-15
|
20
|
15
|
2.2
|
2900
|
45
|
2.5
|
|
ZWL40-15-30
|
15
|
30
|
3
|
2900
|
48
|
2.5
|
|
ZWL50-10-20
|
10
|
20
|
2.2
|
2900
|
45
|
2.5
|
|
ZWL50-20-15
|
20
|
15
|
2.2
|
2900
|
45
|
2.5
|
|
ZWL50-18-22
|
18
|
22
|
3
|
2900
|
48
|
2.5
|
|
ZWL50-15-30
|
15
|
30
|
3
|
2900
|
48
|
2.5
|
|
ZWL65-30-18
|
30
|
18
|
4
|
2900
|
45
|
2.5
|
|
ZWL65-20-30
|
20
|
30
|
5.5
|
2900
|
45
|
2.5
|
|
ZWL65-25-40
|
25
|
40
|
7.5
|
2900
|
50
|
3
|
|
ZWL80-40-16
|
40
|
16
|
4
|
1450
|
50
|
3
|
|
ZWL80-65-25
|
65
|
25
|
7.5
|
2900
|
50
|
3
|
|
ZWL80-80-35
|
80
|
35
|
15
|
2900
|
45
|
3
|
|
ZWL80-50-60
|
50
|
60
|
22
|
2900
|
55
|
3
|
|
ZWL80-80-45
|
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)
|
|
|
ZWL100-80-20
|
80
|
20
|
7.5
|
1450
|
53
|
4
|
|
ZWL100-100-15
|
100
|
15
|
7.5
|
1450
|
50
|
4
|
|
ZWL100-100-20
|
100
|
20
|
11
|
1450
|
53
|
4
|
|
ZWL100-100-30
|
100
|
30
|
22
|
2900
|
53
|
4
|
|
ZWL100-80-45
|
80
|
45
|
30
|
2900
|
55
|
4
|
|
ZWL100-80-60
|
80
|
60
|
37
|
290
|
53
|
4
|
|
ZWL100-80-80
|
80
|
80
|
45
|
2900
|
50
|
4
|
|
ZWL125-120-20
|
120
|
20
|
15
|
1450
|
55
|
4.5
|
|
ZWL150-200-15
|
200
|
15
|
15
|
1450
|
60
|
5
|
|
ZWL150-200-20
|
200
|
20
|
22
|
1450
|
60
|
5
|
|
ZWL150-200-28
|
200
|
28
|
30
|
1450
|
65
|
5
|
|
ZWL150-400-25
|
400
|
25
|
55
|
1450
|
45
|
5
|
|
ZWL150-180-40
|
180
|
40
|
55
|
1450
|
65
|
5
|
|
ZWL200-280-12
|
280
|
12
|
22
|
1450
|
62
|
5
|
|
ZWL200-300-18
|
300
|
18
|
37
|
1450
|
59
|
5
|
|
ZWL200-300-25
|
300
|
25
|
45
|
1450
|
55
|
5
|
|
ZWL200-280-28
|
280
|
28
|
55
|
1450
|
61
|
5
|
|
ZWL250-400-22
|
400
|
22
|
55
|
1450
|
65
|
5
|
|
ZWL300-800-14
|
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.