Product Overview
The WQ series submersible sewage pump is a next-generation wastewater pumping solution developed by integrating advanced international technology with real-world sewage handling conditions. Designed for reliable performance in demanding environments, the WQ pump features high efficiency, energy-saving operation, anti-clogging design, and automatic installation capabilities. It is engineered to transport wastewater and sewage containing solid particles and long fibrous materials without blockage.
The pump utilizes a single-channel or double-channel impeller structure combined with a new mechanical seal system, providing excellent solids-handling capacity. A well-designed volute chamber and an impeller that has passed dynamic and static balance testing contribute to improved operational efficiency and stability while minimizing vibration during operation.
The hydraulic performance of the WQ series is mature and reliable, making it suitable for municipal engineering projects, building drainage systems, industrial wastewater treatment, and various other sewage transport applications.
WQ vs WQK – Understanding the Difference
Both WQ and WQK belong to the submersible sewage pump family, with the primary distinction being the presence of a cutting mechanism:
- WQ Type: Features anti-clogging sewage handling and large solids-passing capability, suitable for general sewage, solid particles, and fibrous materials.
- WQK Type: A cutting-type submersible sewage pump equipped with a cutting mechanism that can chop long fibers, cloth strips, and other blockage-prone materials before discharge, making it more suitable for conditions with higher debris content and blockage risks.
In simple terms, the WQ model focuses on anti-clogging sewage transport, while the WQK model adds a cutting function for enhanced blockage prevention.
Applications
The WQ submersible sewage pump is widely used across multiple sectors:
- Urban wastewater treatment plant drainage systems
- Municipal engineering and construction site dewatering
- Residential area sewage pumping stations
- Civil air defense system drainage
- Hospital, hotel, and commercial facility sewage discharge
- Industrial and commercial heavily polluted wastewater discharge
- Mining and exploration site drainage
- Rural biogas digesters and farmland irrigation
- Water treatment plant water supply systems
Key Features
1. Anti-Clogging Hydraulic Design
The large-channel impeller design significantly improves solids-handling capability, effectively passing fibrous materials up to 5 times the pump diameter and solid particles up to approximately 50% of the pump diameter.
2. Optimized Design with High Efficiency
Rational pump design paired with properly matched motors delivers high efficiency and significant energy-saving performance.
3. Double Mechanical Seal System
The mechanical seal employs a double-series configuration using hard, corrosion-resistant tungsten carbide material, enabling safe continuous operation for over 8,000 hours.
4. Compact Structure and Easy Installation
The pump features a compact design with small footprint, easy mobility, and simple installation. No pump room construction is required – the pump operates directly submerged in water, significantly reducing project costs.
5. Oil-Water Sensor Protection
A sensor in the oil chamber detects water intrusion if the mechanical seal fails, sending an alarm signal to activate protective measures.
6. Automatic Safety Control Cabinet
An optional fully automatic safety protection control cabinet monitors water leakage, electrical leakage, overload, and over-temperature conditions, ensuring safe and reliable pump operation.
7. Dual-Rail Automatic Coupling Installation
The dual-rail automatic coupling installation system greatly simplifies pump installation and maintenance, eliminating the need for personnel to enter the sewage pit.
8. Automatic Float Switch Control
A float switch can automatically control pump start and stop based on water level changes, enabling unattended operation.
9. Full-Range Overload Protection
The motor is guaranteed not to overload within the specified head range.
10. Water-Jacket External Circulation Cooling
For applicable models, a water-jacket external circulation cooling system ensures safe motor operation even in dry-running conditions.
11. Flexible Installation Options
Two installation methods are available: fixed automatic coupling installation and mobile free installation, accommodating various application scenarios.
Model Designation
| WQ | Submersible Sewage Pump |
| JY | With Agitation Device |
| P | Stainless Steel Material |
| B | Explosion-Proof Type |
| 80 | Nominal Discharge Diameter (mm) |
| 40 | Rated Flow (m³/h) |
| 15 | Rated Head (m) |
| 4 | Rated Motor Power (kW) |
Installation & Operation Precautions
- Pre-Use Inspection: Carefully inspect cables for damage, check that all fasteners are secure, and verify that the pump has not been deformed or damaged during transport or storage.
- Insulation Testing: Use a 500V megohmmeter to measure insulation resistance between motor phases and to ground. The value should not be less than 2 MΩ. If below this threshold, dry the motor stator winding at a temperature not exceeding 120°C.
- Installation Methods: The WQ series supports automatic coupling fixed installation and mobile installation. For fixed installation, thread chains through the two lifting rings and lift the pump evenly and slowly along the guide rails until it couples automatically. For mobile installation, connect the hose first, then use chains through the lifting rings. Never use the cable as a lifting rope.
- Rotation Direction: From the inlet perspective, the pump should rotate counterclockwise. If reversed, swap any two cable wire connections.
- Grounding: The pump casing must be properly grounded according to relevant regulations. For safety, personnel must not enter the water while the pump is operating.
- Automatic Control: The pump must be equipped with an automatic water pump control cabinet. Direct connection to the power grid or use of knife switches is prohibited.
- Operating Head: Do not operate the pump at low head conditions for extended periods (generally, operating head should not be less than 60% of rated head). Operation within the recommended head range is preferred to prevent motor burnout.
- Dry Running: Pumps without self-circulation cooling must not operate with the motor exposed above the liquid surface for extended periods.
Maintenance & Care
- Assign dedicated personnel for management and use, with regular checks of insulation resistance between the motor winding and casing.
- After each use, especially with thick or viscous slurry, run the pump in clean water for several minutes to prevent sediment buildup.
- For extended non-use periods, remove the pump from water to prevent stator winding moisture absorption and extend service life.
- Under normal conditions, add or replace oil (10-30 grade motor oil) in the oil chamber every 300-500 hours of operation to maintain proper mechanical seal lubrication.
- After disassembly or repair, conduct a 0.2 MPa air-tightness test on the casing assembly to ensure motor seal integrity.
- The sealing ring between the impeller and pump body provides sealing function. Replace if damaged to maintain optimal pump performance.
Operating Conditions
- Medium temperature must not exceed 60°C, specific gravity between 1.0-1.3 kg/dm³, pH value between 5-9.
- For pumps without internal circulation cooling, the motor portion must not protrude more than 1/2 above the liquid surface.
- The pump must operate within the specified head range to prevent motor overload. For full-head-range operation, specify when ordering.
- Motor current must not exceed the rated current during operation.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Pump fails to start | Power supply issue, cable damage, control cabinet fault | Check power supply, inspect cables, verify control cabinet |
| Low flow or head | Impeller blockage, reversed rotation, worn seal ring | Clean impeller, check rotation direction, replace seal ring |
| Motor overload | Operating below minimum head, foreign object in impeller | Adjust operating head, remove foreign object |
| Leakage detected | Mechanical seal failure, oil chamber water intrusion | Replace mechanical seal, check oil chamber |
| Excessive vibration | Impeller imbalance, bearing wear, loose mounting | Rebalance impeller, replace bearings, tighten mounting bolts |
| Insulation resistance low | Moisture in winding, cable damage | Dry winding, replace cable |
Technical Specifications
| Flow Rate | 5-3000 m³/h |
| Head | 5-60 m |
| Motor Power | 0.75-315 kW |
| Outlet Diameter | 50-500 mm |
| Maximum Solids Diameter | Up to 50% of pump diameter |
| Maximum Fibrous Material Length | Up to 5 times pump diameter |
| Medium Temperature | ≤ 60°C |
| pH Range | 5-9 |
| Continuous Operation | 8,000+ hours |
Conclusion
The WQ submersible sewage pump series offers a reliable, efficient, and versatile solution for wastewater management across municipal, industrial, and commercial applications. Its anti-clogging design, automatic control features, and robust mechanical construction make it an ideal choice for demanding sewage handling environments.
For specific model selection, installation guidance, or technical consultation, contact our engineering team to find the optimal pump configuration for your application requirements.
Product specifications are subject to change based on specific order requirements. Please consult with our technical team for detailed specifications tailored to your application.