Product Overview
The WQ submersible sewage pump is a next-generation wastewater pumping solution developed on the foundation of advanced international technology, combined with real-world sewage treatment conditions. Designed to handle wastewater containing solid particles, long fibers, and various debris, this pump delivers high efficiency, energy savings, and zero clogging in demanding municipal, industrial, and commercial drainage applications.
The pump features a single-channel or dual-channel impeller design paired with a dual-series tungsten carbide mechanical seal system, providing excellent solids-handling capability. The optimized volute chamber and dynamically balanced impeller improve operational efficiency and stability while reducing vibration during continuous service. Its mature hydraulic performance makes it a dependable choice for municipal wastewater treatment plants, building drainage systems, industrial sewage disposal, and general wastewater transfer operations.
The WQ series is available in two configurations: the standard WQ type focuses on anti-clogging performance and large solids passage, making it ideal for general sewage applications. The WQK cutting type adds a cutting mechanism capable of shredding long fibers, cloth strips, and other tangle-prone materials before discharge, better suited for wastewater with high debris content where blockage risk is elevated.
Key Features
- Anti-Clogging Hydraulic Design: Large-flow passage impeller allows effective passage of fibrous materials up to 5 times the pump diameter and solid particles up to approximately 50% of the pump diameter, significantly reducing blockage risk.
- High-Efficiency Motor Matching: Rational design with properly matched motors delivers superior energy efficiency and noticeable energy savings over conventional pumping solutions.
- Dual Mechanical Seal System: Series-mounted tungsten carbide mechanical seals provide corrosion resistance, wear durability, and reliable operation for over 8,000 continuous hours.
- Compact Submersible Structure: Integrated motor-pump design eliminates the need for a separate pump house — simply submerge in water to begin operation, reducing installation costs substantially.
- Oil-Water Sensor Protection: A probe installed in the oil chamber detects water ingress caused by mechanical seal damage, sending an immediate alarm signal to trigger protective shutdown.
- Intelligent Control Cabinet: Optional full-automatic safety protection control cabinet monitors leakage, electrical faults, overload, and over-temperature conditions for safe and reliable operation.
- Automatic Coupling Installation: Dual-rail auto-coupling mounting system enables installation and maintenance without personnel entering the sewage pit, greatly improving safety and convenience.
- Float Switch Auto-Control: Automatically starts and stops the pump based on water level changes, eliminating the need for dedicated operators.
- Overload Protection: Motor operation remains within safe current limits throughout the specified head range, preventing overload damage.
- Water-Jacket External Cooling: Optional water-jacket cooling system allows safe dry-run operation when the motor is not submerged.
- Flexible Installation Options: Available in fixed automatic coupling installation and mobile free installation modes to suit different application scenarios.
Applications
The WQ submersible sewage pump serves a wide range of drainage and wastewater transfer applications:
- Municipal wastewater treatment plant discharge systems
- Municipal engineering and construction site drainage
- Residential area sewage pumping stations
- Civil air defense system drainage stations
- Hospital and hotel wastewater discharge
- Industrial and commercial facility heavily polluted wastewater discharge
- Mining and exploration site drainage support
- Rural biogas digesters and farmland irrigation
- Water treatment plant water supply systems
Technical Specifications
| Parameter | Details |
|---|---|
| Product Type | Submersible Sewage Pump (WQ) / Cutting Type (WQK) |
| Impeller Type | Single-channel or Dual-channel |
| Mechanical Seal | Dual-series tungsten carbide |
| Motor Insulation | Class B or F |
| Maximum Medium Temperature | 60°C |
| Medium Specific Gravity | 1.0–1.3 kg/dm³ |
| pH Range | 5–9 |
| Continuous Operation Life | 8,000+ hours |
| Solids Passage Capacity | Up to 50% of pump diameter |
| Fiber Passage Capacity | Up to 5× pump diameter |
| Installation Modes | Fixed auto-coupling / Mobile free installation |
Model Designation
Example: 80 WQ 40-15-4
- 80: Nominal Discharge Diameter (mm)
- WQ: Submersible Sewage Pump
- JY (optional): With Agitation Device
- P (optional): Stainless Steel Material
- B (optional): Explosion-Proof Type
- 40: Rated Flow (m³/h)
- 15: Rated Head (m)
- 4: Rated Motor Power (kW)
Operating Conditions
- Medium temperature must not exceed 60°C; specific gravity between 1.0–1.3 kg/dm³; pH value within 5–9 range.
- For pumps without internal self-circulating cooling systems, the motor portion should not exceed 1/2 above the liquid surface.
- The pump should generally operate within the specified head range to ensure motor does not overload. Full-head-range operation should be specified at the time of order.
- Motor current must not exceed the rated current during operation.
- Pumps should not operate at low head conditions for extended periods (generally not below 60% of rated head) to prevent motor burnout from overload.
- Pumps without self-circulating cooling must not operate exposed above water for extended periods to prevent overheating damage.
Common Troubleshooting
| Issue | Cause | Solution |
|---|---|---|
| Low or no flow | Wrong rotation direction; blocked pipe/impeller; low speed; excessive head; high medium viscosity | Correct rotation; clear debris; check electrical; reduce head or select suitable pump; dilute medium |
| Unstable operation | Impeller imbalance; bearing failure | Re-balance or replace impeller; replace bearing |
| Pump fails to start | Missing phase; jammed impeller; broken cable; burned winding; control fault | Repair wiring; clear obstruction; check with ohmmeter; replace winding or control unit |
| High current | Low voltage; blocked pipe/impeller; high medium density/viscosity; insufficient head | Adjust voltage; clear blockage; reduce viscosity; increase operating head |
| Low insulation resistance | Cable end leakage; cable damage; seal wear; O-ring failure; casing corrosion | Tighten connections; replace cable; replace mechanical seal or O-rings; repair or replace casing |
Maintenance Guidelines
- Assign dedicated personnel to manage the pump and regularly check insulation resistance between motor windings and casing.
- After each use — especially with thick or viscous media — run the pump in clean water for several minutes to prevent sediment buildup.
- Remove the pump from water when not in use for extended periods to prevent winding moisture damage and extend service life.
- Add or replace oil (10–30 grade machine oil) in the oil chamber every 300–500 hours of operation to maintain mechanical seal lubrication.
- After disassembly or repair, conduct a 0.2 MPa air-tightness test to ensure motor sealing reliability.
- Replace the sealing ring between the impeller and pump body promptly if damaged to maintain optimal efficiency.
Why Choose the WQ Series?
The WQ submersible sewage pump combines proven hydraulic design with modern protection features to deliver reliable performance in the most demanding wastewater environments. Its anti-clogging impeller technology, dual-seal protection system, and intelligent monitoring capabilities reduce maintenance downtime and extend service life. Whether handling municipal sewage, industrial wastewater, or construction site drainage, the WQ series provides a cost-effective and dependable pumping solution.
For applications requiring debris cutting capability, the WQK cutting type variant offers enhanced protection against fiber and cloth blockage, ensuring smooth discharge even in challenging wastewater conditions.
Contact Chaodun Pump for customized WQ/WQK submersible sewage pump solutions tailored to your project requirements.