ZWL Non-Clogging Self-Priming Sewage Pump

Product Description

Model Code Explanation

Product Introduction

The ZWL Non-Clogging Direct-Coupled Self-Priming Pump integrates both self-priming and non-clogging sewage functions. It uses an axial backflow design and unique pump body and impeller flow passage designs. Like a regular self-priming clean water pump, it does not require the installation of a bottom valve or priming water. It can also handle large solid particles and long fiber impurities. This pump is widely used in municipal sewage projects, river pond waste treatment, sedimentation of waste minerals, light industry, papermaking, food, chemical engineering, pharmaceuticals, power plants, slurry, and mixed chemical media.

The pump features a simple structure, good self-priming performance (self-priming height up to 5 meters), strong sewage discharge capability, high efficiency, energy-saving, and easy maintenance (completely replaceable with WQ, QW submersible sewage pumps). It has a broad application market and promising development prospects in the sewage pump product range.

Product Features

• Dual-impeller structure significantly improves the pump’s ability to pass debris.
• The mechanical seal uses a new type of wear-resistant material and operates long-term in an oil chamber.
• The compact overall structure, small size, low noise, and easy maintenance make it convenient for users to replace components.
• The automatic control cabinet can automatically control the pump’s operation and shutdown based on the required liquid flow changes, eliminating the need for manual supervision and making it very user-friendly.
• The pump can be configured with different installation methods according to user requirements, making installation and maintenance much easier, and users do not need to enter the sewage pit.
• The pump can operate within the design range while ensuring the motor does not overload.

Product Applications

The ZWL Non-Clogging Direct-Coupled Self-Priming Pump is suitable for the discharge of highly polluted wastewater from factories and commercial enterprises, sewage stations in residential areas, water distribution systems in urban sewage treatment plants, drainage stations in civil defense systems, water supply equipment in water treatment plants, sewage discharge from hospitals and hotels, municipal construction sites, mining machinery, rural biogas ponds, and agricultural irrigation. It can transport sewage containing particles, as well as clear water and mildly corrosive media.

Operating Conditions

• Ambient temperature ≤ 50°C, medium temperature ≤ 80°C (special requirements can reach up to 200°C).
• The pH value of the medium: Cast iron material is suitable for pH 6–9, stainless steel is suitable for pH 2–13.
• Medium density should not exceed 1240 kg/m³.
• The self-priming height must not exceed the specified value of 4.5–5.5 meters, and the suction pipe length should be ≤ 10 meters.
• The suspended particle diameter passing through should be 60% of the pump’s outlet diameter, and the fiber length should be 5 times the pump’s outlet diameter.

Structure and Working Principle

The ZWL Non-Clogging Direct-Coupled Self-Priming Pump consists mainly of the pump body, impeller, rear cover, mechanical seal, pump shaft, bearing seat, inlet valve, gas-liquid separation pipe, water injection valve, inlet and outlet connecting pipes, etc.

Working Principle: The pump body is equipped with a liquid storage chamber, and through the upper return hole and lower circulation hole, it communicates with the pump working chamber, forming an axial flow mixing system. After the pump stops working, the pump chamber contains a certain volume of liquid. When the pump starts, the stored liquid in the chamber is carried with air and thrown upwards by the impeller. The liquid flows through the gas-liquid separation pipe and returns to the working chamber, with the gas being expelled from the pump. This process creates a certain vacuum in the pump and achieves self-priming.

Structure Diagram

NO.	Name	Serial Number	Name
1	Inlet Connection	9	Impeller
2	Inlet Flange	10	Mechanical Seal
3	Inlet Valve Seat	11	Water Stop Ring
4	Water Supply 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

Preparation Work

1. Check if the pump base, bearing housing, bearing seat, and other connection parts are firmly tightened. If loose, tighten them.
2. Manually rotate the coupling to check for any jamming or abnormal noise.
3. Open the water inlet valve above the pump and add liquid equal to at least two-thirds of the pump body volume. Close the valve. No need to prime the pump again after this step.
4. Connect the power and perform a trial rotation, ensuring the motor turns clockwise (reversing is strictly prohibited).
5. Start the pump and observe if it runs normally. If any abnormality is detected, identify and resolve the issue.

OEM & Custom Solutions

Supports OEM and ODM, customized materials, corrosion-resistant configurations, flange customization, voltage options, private labeling and export packaging.

FAQs for Overseas Buyers

1. Can the pump pass solid particles?
Yes. It supports solids depending on the inlet diameter.

2. Does it need a bottom valve?
No. It is a true self-priming sewage pump.

3. Can it handle slurry or fibrous waste?
Yes. It is designed for sludge, fibers and mixed sewage.

4. What is the medium temperature range?
0–80°C for most wastewater conditions.

5. Is maintenance complicated?
No. The pump structure is simple and easy to maintain.

6. What is the delivery time?
7–15 days depending on order quantity.

7. Are spare parts available?
Yes. Impellers, seals, wear plates and bases are available.