ZW/ZWL Non-Clogging Self-Priming Sewage Pump Industrial

Product Overview

The ZW Series Self-Priming Submersible Sewage Pump is a next-generation wastewater pump developed by our engineering team through extensive research and multiple technical improvements. This pump features high energy efficiency, anti-clogging performance, non-blocking hydraulic design, and automatic installation and control functions. It effectively handles large solid particles and long fibrous impurities with minimal risk of clogging.

The ZW series is ideal for municipal and industrial wastewater discharge applications and serves as a ground-based self-priming alternative to certain submersible pumps.

Model Designation

Key Features

• Unique single or double-blade impeller design significantly enhances the ability to handle solid particles and long fibers, allowing the pump to pass fibrous materials up to five times the pump inlet diameter and particles approximately 50% of the inlet hole size.

• Mechanical seals made from advanced corrosion-resistant hard alloys ensure over 8000 hours of continuous safe operation.

• Compact design with low noise, easy maintenance, and no need for a pump house, reducing civil building costs.

• The seal oil chamber is equipped with high-precision anti-interference leak sensors, and a thermal protector is embedded in the positioning device’s windings to provide automatic motor protection.

• Optional fully automatic control panel enables start/stop control based on liquid level changes.

• Dual-rail automatic coupling system available for easy installation and maintenance without entering the sewage pit.

• The pump operates across its entire head range without overloading the motor.

Engineering Summary

The ZW Series self-priming submersible sewage pump operates based on axial flow self-starting principles, with a controlled liquid volume retained in the pump casing after shutdown to facilitate rapid self-starting when restarted. Its operation mechanism is similar to traditional self-priming clean water pumps, but reinforced flow channels and impeller geometry significantly enhance solid and fiber handling capabilities.

The ZW series pump provides up to 5.5 meters of self-priming suction, has robust solid handling capabilities, high hydraulic efficiency, and is easy to maintain, making it ideal for frequent start/stop operations and complex media handling when a pump room is unavailable.

Typical Applications

The ZW Series Self-Priming Submersible Sewage Pump is suitable for a variety of 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

• Sewage, wastewater with solid particles, clean water, or mildly corrosive liquids.

System & Operation

Components & Supply

• The pump is connected to the motor via a rigid coupling, ensuring structural integrity and reliable performance.

• The pump features a single or double-blade impeller design to improve solid and fiber handling.

• Mechanical seals made of hard alloys extend operational life and minimize leakage risks.

• The optional automatic control panel enables automatic pump operation based on liquid level changes, providing more efficient and secure operation.

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 power 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 level, 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

	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

Performance Parameters

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

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

1. 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.
2. 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.
3. 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.
4. Q: What materials are available?
   A: Standard models use cast iron; stainless steel and special alloy materials are available for corrosive media.
5. 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.
6. Q: How often does it require maintenance?
   A: Routine inspection every 500 hours is recommended; seals and bearings should be replaced as needed.
7. 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.