125QJB Deep Well Submersible Pump Factory China Leading Water Pump Suppliers

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The 125QJB Deep Well Submersible Pump is a high-performance water extraction solution engineered for versatility and efficiency. Featuring an advanced frequency conversion winding design, this pump ensures stable operation across a wide range of 1HZ to 50HZ, significantly reducing energy consumption while extending the operational lifespan of the motor. It is specifically designed for clear water applications, integrating robust CAD-optimized architecture to deliver consistent flow and head pressure in demanding environments.

Built with a water-loaded wet submersible three-phase asynchronous motor, the 125QJB utilizes clean water for both cooling and lubrication, ensuring thermal stability. The integration of a regulating diaphragm manages internal pressure fluctuations caused by temperature rises, while dual oil seals and a specialized sand ring provide a comprehensive defense against well particulates. Whether for industrial, agricultural, or domestic use, this pump delivers reliable, high-capacity water supply with professional-grade durability.

Detailed Parameters

Power Supply	Three-phase AC 380V (±5%), 50HZ (±1%)	Max Diving Depth	Up to 70 meters
Water Temperature	≤ 20 °C	pH Value Range	6.5 - 8.5
Solid Impurities	≤ 0.01% (mass ratio)	Chloride Ion Content	≤ 400mg/L
Hydrogen Sulfide	≤ 1.5mg/L	Min. Bottom Clearance	3 meters from well bottom
Flow Control Range	0.7 - 1.2 times the rated flow	Motor Insulation	≥ 100MΩ (after installation)

Key Advantages

Anti-Sand Structure

Equipped with dual oil seals and a precision sand ring to prevent particulates from entering the motor cavity.

Extended Lifespan

Frequency conversion winding design minimizes wear and maximizes energy efficiency for long-term use.

CAD Optimized

Designed via computer CAD for a simple structure and superior hydraulic technical performance.

Thermal Stability

Water-loaded wet motor with a regulating diaphragm to handle expansion/contraction from heat.

Water Lubrication

Rubber bearings utilize water lubrication, reducing friction and eliminating oil contamination risks.

Precision Coupling

Robust coupling between pump and motor shafts prevents jumping and vibration during startup.

Product Gallery

Application Scenarios

Deep Well Intake

Efficient extraction from deep aquifers for industrial and municipal use.

Agricultural Irrigation

Consistent water supply for large-scale crop and field irrigation systems.

High-rise Supply

Powerful head pressure for supplying water to multi-story buildings.

Mountain Water Supply

Reliable lift capabilities for challenging terrain and remote mountain areas.

Garden Irrigation

Precise flow management for landscaped gardens and public parks.

Domestic Water

Clean, stable water extraction for residential homes and estates.

Performance Comparison

Feature	Standard Submersible	125QJB Series
Energy Efficiency	Fixed Frequency (High Cost)	Frequency Conversion (Low Cost)
Sand Protection	Single Seal / Basic	Dual Oil Seals + Sand Ring
Motor Cooling	Air/Oil Cooled	Water-Loaded Wet Structure
Operational Stability	Prone to Vibration	CAD-Optimized / Low Noise
Service Life	Standard Cycle	Extended via Advanced Winding

Frequently Asked Questions

Q: What is the purpose of the frequency conversion winding in the 125QJB pump?

The frequency conversion winding allows the motor to operate stably between 1HZ and 50HZ, which enables energy saving and extends the overall service life of the pump by reducing mechanical stress.

Q: Can the 125QJB pump be used to pump mud or sand?

No. This pump is strictly designed for clear water. Pumping mud or sand can cause premature wear to the impellers and bearings, leading to equipment failure.

Q: How should the motor cavity be prepared before installation?

The motor cavity must be completely filled with clean, non-corrosive cold water or distilled water to ensure proper cooling and lubrication of the bearings before use.

Q: What is the minimum distance required between the pump and the bottom of the well?

To prevent the pump from sucking in silt or mud, the bottom of the submersible pump should be positioned at least 3 meters above the bottom of the well.

Q: What protections should be included in the starting equipment?

The starting equipment should feature comprehensive protections including short circuit overload, phase loss, undervoltage, grounding, and idling protection.

Q: How often should maintenance be performed on the 125QJB series?

It is recommended to dismantle and maintain the pump after one year of operation, or if it has been submerged for two years, replacing all worn parts like impellers and seals.

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