Description
The Doyin AC Submersible Pump 4SD3 is a high-efficiency deep-well borehole pump designed for reliable water extraction. The “4SD3” nomenclature signifies a 4-inch diameter pump with a rated flow of 3 (3,000 liters per hour).
It is a popular choice for residential water supply, agricultural irrigation, and industrial applications due to its robust multistage design.
Key Technical Specifications
While exact performance varies by the number of stages (impellers) and motor horsepower, the 4SD3 series generally includes:
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Rated Flow: 3 (approx. 50 liters per minute).
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Max Flow: Can reach up to 4.2 – 4.8 .
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Power Source: Standard AC power (available in Single-phase 220-240V or Three-phase 380-415V).
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Maximum Head (Lift): Depending on the model, it can lift water from 30 meters to over 250 meters vertically.
Professional Engineering Features
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Anti-Sand Floating Impellers: Made from high-strength technopolymer (PPO), these impellers are designed to “float” to allow small sand particles (up to 150g/) to pass through without seizing the motor.
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Stainless Steel Construction: The external casing, intake, and discharge are typically made of AISI 304 Stainless Steel to prevent corrosion and ensure a long lifespan in submerged environments.
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Oil-Filled Motor: The motor is usually filled with food-grade lubricant to ensure superior cooling and lubrication of the bearings at high pressures.
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Check Valve: Most models include a built-in non-return valve to prevent water from flowing back into the pump, which protects the impellers from “water hammer” damage.
Primary Applications
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Domestic Use: Providing high-pressure water for multi-story buildings and homes.
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Agriculture: Ideal for sprinkler and drip irrigation systems for small to medium-sized farms.
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Industrial Supply: Reliable for factory water cycles or pressure boosting.
Comparison: AC (4SD3) vs. DC/Hybrid Models
If you are deciding between this AC model and a Solar (DC) model, here are the main differences:
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