ZWL Non-Clogging Self-Priming Sewage Pump

Model Designation

Key Features 

• Powerful Self-Priming Capability: No foot valve required, simplifying the system design and enhancing self-priming efficiency.

• Compact Design: Saves space, easy to install and maintain, and structurally reliable.

• High Efficiency & Long Service Life: Efficient operation, suitable for complex working environments, and durable.

• Wide Applicability: Suitable for wastewater transport applications containing large solid particles and long fibrous impurities.

Engineering Summary 

The ZWL pump utilizes an internal liquid storage chamber combined with a gas-liquid separation structure.
After shutdown, a certain volume of liquid remains in the pump casing. Upon startup, the stored liquid mixes with air entering the aerator. The gas-liquid mixture is separated, air is expelled, and a vacuum is formed inside the pump chamber, completing the self-priming process.
This design ensures stable self-priming performance, strong solid handling capacity, and continuous operation under complex conditions.

Typical Applications 

The ZW series pump is widely used in:

• Municipal wastewater treatment projects and sewage treatment plants

• Industrial and commercial wastewater discharge systems

• Hospital, hotel, and urban household sewage discharge

• Construction sites, mines, and sediment impurity treatment

• Rural biogas pits, agricultural irrigation, and aquaculture facilities

The pump can handle wastewater containing particles, sludge, and mildly corrosive media, as well as clean water and weakly corrosive liquids.

System Configuration 

Pump Components:

• Pump casing

• Impeller

• Rear cover

• Mechanical seal

• Pump shaft

• Bearings and bearing housing

• Air inlet valve

• Gas-liquid separation pipe

• Priming valve

• Inlet/outlet connections

Components and Supply

The components of the pump are made from corrosion-resistant, high-strength materials to ensure long-term stable operation.
Key components include:

• Pump casing: Made of cast iron or stainless steel, offering excellent corrosion resistance and pressure performance.

• Impeller: Optimized design ensures fluid passage capability and self-priming performance.

• Bearing system: Provides stable support, extending the equipment’s service life.

• Sealing system: Features a dual-seal design to effectively prevent liquid leakage.

Technical Service 

The ZW self-priming pump offers comprehensive technical support and services, including:

• Installation guidance: Detailed installation manuals and on-site support.

• Maintenance and servicing: Regular maintenance and repairs to ensure efficient pump operation.

• Technical support: 24/7 technical support to resolve equipment issues.

Operating Conditions 

• Ambient Temperature: ≤50°C

• Medium Temperature: ≤80°C (up to 200°C with special design)

• pH Range:

  • Cast iron: pH 6–9

  • Stainless steel: pH 2–13

• Medium Density: ≤1240 kg/m³

• Self-Priming Height: ≤4.5–5.5 meters

• Suction pipe length: ≤10 meters

• Maximum Suspended Solid Diameter: ≤60% of pump outlet diameter

• Maximum Fiber Length: ≤5 times the pump outlet diameter

Service Conditions 

The ZW self-priming pump performs steadily in varying working environments and adapts to different operating conditions.

• Operating environment temperature: Suitable for a wide range of operational environments.

• Humidity tolerance: Suitable for high-humidity environments, with excellent moisture resistance.

• Flow and pressure fluctuations: Remains stable under fluctuating flow and pressure conditions.

Protection Features 

The ZW self-priming pump is equipped with a full protection system, including:

• Overload protection: Prevents the pump from operating under overload conditions, protecting the equipment.

• Overheat protection: Automatically shuts down when the temperature exceeds the set limit.

• Dry-run protection: The system automatically shuts down if the pump fails to prime properly.

Selection Criteria 

When selecting the ZW self-priming pump, consider the following factors:

• Flow requirements: Determine the required flow based on the actual application.

• Media type: Select the appropriate pump material for different chemical media.

• Operating pressure: Ensure the pump’s maximum working pressure meets system requirements.

• Operating environment: Consider external factors such as ambient temperature and humidity.

Specifications & Installation

Outline Drawing

Performance Data

Performance Parameters

Operating Manual

1. Check if the pump base, bearing housing, bearing seat, and other connection parts are firmly tightened. If any parts are 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 further priming will be required after this step.

4. Connect the power supply and perform a trial rotation, ensuring the motor turns clockwise (reversing is strictly prohibited).

5. Start the pump and observe its operation. If any abnormalities are detected, identify and resolve the issue.

OEM & Custom

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

FAQs

1. 1. Can the pump pass solid particles?
   Yes. It supports solids depending on the inlet diameter.
2. 2. Does it need a bottom valve?
   No. It is a true self-priming sewage pump.
3. 3. Can it handle slurry or fibrous waste?
   Yes. It is designed for sludge, fibers and mixed sewage.
4. 4. What is the medium temperature range?
   0–80°C for most wastewater conditions.
5. 5. Is maintenance complicated?
   No. The pump structure is simple and easy to maintain.
6. 6. What is the delivery time?
   7–15 days depending on order quantity.
7. 7. Are spare parts available?
   Yes. Impellers, seals, wear plates and bases are available.