Product Overview
The ZWL Series Self-Priming Non-Clogging Submersible Sewage Pump is a multi-stage centrifugal pump with axial flow self-priming capability. This pump is designed for wastewater transfer with large solid particles and long fibers, minimizing clogging risks. It integrates an axial circulation structure with an optimized pump casing and impeller flow path, allowing it to start and operate without foot valves or multiple startups. It is widely used in municipal and industrial wastewater discharge, sewage suction, and emergency drainage applications.
Model Designation
Key Features
-
Single or double-blade impeller design, significantly improving the capacity to handle solid particles and long fibers.
-
Advanced corrosion-resistant hard alloy mechanical seals for continuous operation of over 8000 hours with reliable sealing.
-
Compact structure, low noise, easy maintenance, and no need for pump houses, reducing space and construction costs.
-
Equipped with high-precision anti-interference leakage sensors and thermal protection devices, providing automatic motor protection.
-
Optional fully automatic control panel enables automatic start/stop operation based on liquid level changes, reducing manual intervention.
-
Available dual-rail automatic coupling system for easy installation and maintenance without entering the sewage pit.
-
The motor operates within the entire design performance range without overloading.
Engineering Summary
The ZWL Series Submersible Sewage Pump operates based on axial flow self-priming principles. After shutdown, the pump retains a controlled volume of liquid inside the pump casing to ensure rapid self-starting when restarted. Its operation mechanism is similar to that of traditional self-priming clean water pumps, but reinforced flow channels and impeller geometries significantly enhance solid and fiber handling capacity. The pump offers up to 5.5 meters of self-priming suction, robust solid handling capabilities, high hydraulic efficiency, and easy maintenance, making it an ideal solution for frequent start/stop operations in challenging environments where a pump room is unavailable.
Typical Applications
The ZWL Series Self-Priming Non-Clogging Submersible Sewage Pump is suitable for various applications, including but not limited to:
-
Municipal wastewater treatment and discharge systems
-
Industrial wastewater discharge (chemical, paper, food processing, etc.)
-
Construction site and municipal drainage systems
-
Mining operations and mine dewatering
-
Rural biogas pits and agricultural irrigation
-
Handling sewage, wastewater with solid particles, clean water, or mildly corrosive liquids
System & Operation
Components & Supply
-
The pump is equipped with single or double-blade impellers to improve the handling of solid particles and long fibers.
-
The mechanical seals use advanced corrosion-resistant hard alloys, providing durable performance and reliability.
-
The compact structure and modular design make it easy to install and maintain.
-
The optional automatic control panel ensures seamless start/stop operations based on liquid levels, minimizing manual intervention.
Technical Specifications
Operating Conditions
-
Liquid Temperature:
• Standard pump: −15°C to +70°C
• Hot water pump: +70°C to +120°C -
Ambient Temperature: Up to +40°C
-
Maximum Working Pressure: 10 bar
-
Maximum Allowable Inlet Pressure: Limited by system working pressure
-
Fluid Requirements:
• Clean, low-viscosity, non-flammable, sulfur-free liquids, free from solid particles or fibers
• Suitable for pumping mineral water, softened water, purified water, light oils, and mild chemical fluids
• If the density or viscosity of the liquid exceeds that of water, a higher-rated motor should be selected
• The pump’s suitability for specific liquids depends on factors such as chloride content, pH level, temperature, and solvent/oil content
Service Conditions
-
Installation Altitude: Must not exceed 1000 meters; for higher elevation applications, specify at the time of order for proper configuration.
-
The pump must not be used in flammable or explosive environments, nor should it handle combustible liquids.
-
Installation should be in a well-ventilated, dry, and vibration-free location.
-
Maximum ambient temperature should not exceed +40°C.
Protection Functions
-
The motor should be equipped with overload, phase failure, and overheat protection devices to prevent damage under abnormal conditions.
-
Dry-run protection is recommended to prevent mechanical seal failure in case of insufficient water supply.
-
Pressure switches or variable frequency drives (VFDs) should be used to keep the pump operating within its safe pressure limits.
-
Check valves and anti-backflow devices must be installed to prevent damage caused by reverse flow after shutdown.
Selection Criteria
-
Select the pump model and number of stages based on required flow rate and head.
-
Choose appropriate wetted materials (e.g., SS304, SS316L) based on fluid temperature, pH, and chloride content.
-
Select sealing structure (mechanical seal or packing seal) based on the fluid’s corrosive properties.
-
Ensure installation space and piping layout compatibility with the horizontal configuration.
-
If the pumped liquid has higher viscosity or density than water, a higher-rated motor should be selected to meet the required shaft power.
Installation & Dimensions
Outline Drawing
Performance Data
|
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
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
- 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.