250QJB Deep Well Submersible Pump China Factory and Reliable Suppliers

Leading China factory and suppliers of 250QJB deep well submersible pumps. We undertake OEM processing to design and manufacture non-standard submersible motors and pumps per GB/T2816-2014 and GB/T2818-2014 standards. Contact us via WhatsApp 17855846335.

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The 250QJB series represents a pinnacle in deep well submersible pump engineering, specifically designed for stability and efficiency in demanding water extraction environments. Featuring an advanced waterproof wire design and a specialized frequency conversion winding, this system enables seamless operational conversion within a 1Hz-50Hz range. This technical innovation not only significantly reduces energy consumption but also dramatically extends the motor's overall service life, ensuring a reliable water supply for critical industrial and agricultural applications.

Engineered for resilience, the motor utilizes high-performance water-resistant conductors that excel under high-frequency impact, pulse peak voltage, and high-temperature aging. Designed for three-phase AC 380V power supplies, the 250QJB is optimized for harsh water quality conditions, maintaining exceptional stability in vertical well installations up to 70 meters. Its computer-aided CAD design ensures a streamlined structure that balances high-volume flow with powerful lift capabilities, making it the ideal choice for professional deep well water management.

Detailed Parameters

Power Supply	Three-phase AC 380V / 50Hz	Max Immersion Depth	Up to 70 Meters
Operating Frequency	1Hz - 50Hz (Frequency Conversion)	Water Temperature	Below 20 °C
pH Value Range	6.5 - 8.5	Chloride Ion Content	≤ 400 mg/L
Hydrogen Sulfide Content	≤ 1.5 mg/L	Solid Impurities	≤ 0.01%
Motor Structure	Water-filled / Water-immersed	Installation Mode	Strictly Vertical

Key Advantages

Extreme Durability

Equipped with special water-resistant conductors that resist high-frequency impact and high-temperature aging for long-term stability.

Energy Efficiency

The frequency conversion winding design optimizes power usage, significantly reducing operational costs over the pump's lifespan.

Advanced Cooling

Water-filled motor cavity provides natural cooling and bearing lubrication, ensuring smooth operation under heavy loads.

Sand Prevention

Dual sand sealing rings and a dedicated discharging ring prevent particulates from damaging the motor internals.

Precision Engineering

CAD-designed structure ensures optimal hydraulic flow and mechanical balance, reducing vibration and noise.

Versatile Application

Ideal for agricultural irrigation, high-rise water supply, and river water intake across diverse geographical terrains.

Product Gallery

Management Platforms

Precision Installation

Detailed setup protocols ensure perfect alignment and secure clamping at the wellhead.

Load Protection

Integrated external overload protection prevents motor burnout during abnormal voltage fluctuations.

Thermal Monitoring

Regular insulation resistance testing (≥ 0.5MΩ) ensures the motor remains safe and efficient.

Hydraulic Balance

Pressure regulating diaphragms manage internal expansion caused by motor temperature rises.

Maintenance Cycle

Scheduled annual inspections and wear-part replacement (impellers, sleeves) maximize longevity.

Winter Storage

Complete water drainage and anti-corrosive storage prevent ice damage during dormant periods.

Investment Return Comparison

Feature	Standard Submersible Pump	250QJB Frequency Series
Energy Cost	High (Fixed Frequency)	Low (Variable Speed Control)
Lifespan	Moderate	Extended (Anti-Aging Winding)
Maintenance	Frequent Part Failure	Reduced via Sand Prevention
Adaptability	Limited Water Quality	High Tolerance for Harsh Water
Operational Stability	Standard	Superior (Low Vibration/Noise)

Frequently Asked Questions

Q: What are the ideal water conditions for the 250QJB pump?

The pump is designed for clean water with a temperature below 20°C, pH value between 6.5-8.5, and solid impurities not exceeding 0.01%.

Q: Can this pump be used for muddy water or new wells?

No, the pump is strictly for clean water. Pumping sediment or muddy water from new wells is prohibited as it may cause premature damage.

Q: How does the frequency conversion feature benefit the operator?

It allows the motor to operate between 1Hz-50Hz, which reduces energy consumption and extends the service life of the pump by optimizing load.

Q: What is the maximum depth for the installation of this pump?

The pump should be completely immersed in water, with a maximum installation depth not exceeding 70 meters.

Q: What precautions should be taken during winter storage?

All water must be discharged from the motor cavity to prevent ice damage from freezing temperatures, and the unit should be stored below 40°C.

Q: What should I do if the pump experiences severe vibration?

Stop the machine immediately. Check if the pump is centered in the well pipe and verify if the supply voltage is stable (not lower than 340V).

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