QD MULTISTAGE SUBMERSIBLE PUMP

Product Introduction

The QD series submersible pumps (with lower water input) stand out for sturdiness and reliability in automatic operation within fixed installations. As portable electric drainage/irrigation equipment, they suit water storage tanks, farmland, industrial/mining construction sites, ships, and households, with features like small size, light weight, and easy operation. Equipped with either a single-phase capacitor-run asynchronous motor or a three-phase asynchronous motor, the pump has a built-in thermal protector. This protector shuts off automatically in case of overheating or over-current, ensuring safe and reliable operation even under harsh conditions.

Component

Pump Body: Cast Iron

Motor Housing: Cast Iron

Impeller: Aluminum

Motor Shaft: 45# Steel

Mechanical Seal: Ceramic/Graphite, Sic-graphite

Motor

1~220V/50Hz, 110V/60Hz, 220V/60Hz on request

Insulation Grade: Class B

Protection: IPX8

Continuous Work S1

Operating Condition

Liquid Temperature up to 40°C

Ambient Temperature up to 40°C

5m maximum immersion depth

Solid Impurities in medium: ≤0.1% (volume ratio), Particle Diameter ≤0.2mm

Medium PH: 6.5–8.5

Features

Adopts closed multi-stage impeller, higher head than ordinary single-stage pumps

Closed multi-stage centrifugal impeller; higher head than single-stage pumps

Optimized motor electromagnetic design: lower temperature rise, strong overload resistance.

Model Parameters

Product Summary

The QD Multistage Submersible Pump is a robust centrifugal drainage solution built for demanding fixed installation environments. Featuring a closed multi-stage impeller design, cast iron construction, and a built-in thermal protector, the QD series pump covers head ratings from 32 to 112 meters across single-phase and three-phase models. With rated flows of 3, 10, and 15 m³/h, global voltage compatibility, and an IPX8-rated sealed motor, the QD electric submersible pump addresses agricultural irrigation, building water supply, industrial drainage, and commercial dewatering from a single well-structured product range.

Detailed Description

The QD multistage submersible pump stacks multiple impeller stages to reach head outputs between 32 and 112 meters — far beyond single-stage alternatives — making it suitable for elevated irrigation, building water supply, basement dewatering, and storage tank transfer. Cast iron pump body and motor housing deliver structural rigidity, while the aluminum impeller keeps rotational mass light and the 45# steel shaft handles continuous torsional load. Ceramic or Sic-graphite mechanical seals wear predictably under prolonged submerged service. The built-in thermal protector cuts the circuit automatically under dry-run or restricted-flow conditions, and single-phase and three-phase models share identical body dimensions for inventory management.

Key Product Features

• Multi-Stage Impeller System: Head outputs from 32 m to 112 m within a single product series, well beyond what single-stage alternatives deliver at comparable power ratings
  
  
• Cast Iron Body and Motor Housing: Rugged construction suited to long-term fixed installation service across agricultural, industrial, and commercial environments
  
  
• Built-in Thermal Protector: Automatic circuit interrupt on motor overtemperature — a critical safeguard in unattended irrigation and drainage applications
  
  
• IPX8 Motor Protection: Certified for continuous submersion up to 5 meters in clean or lightly impurity-loaded water
  
  
• S1 Continuous Duty Rating: The QD submersible drainage pump is rated for uninterrupted operation through extended daily cycles
  
  
• Single and Three-Phase Options: Matching hydraulic specs across both variants support flexible deployment across residential and commercial sites without redesigning the installation

Engineering Advantages

The multi-stage centrifugal approach in the QD series distributes hydraulic work progressively across each impeller stage. Each stage handles a fraction of the total head requirement rather than concentrating full pressure demand on a single impeller. This distribution keeps per-stage differential pressure lower, which translates to more predictable mechanical wear and more consistent pump performance over time — a characteristic that matters in markets where after-sales servicing carries real logistics cost.

For project procurement teams, the model range architecture offers tangible logistical value. All QD models operate at 2900 r.p.m. on 50Hz supply, placing them within the standard efficiency band for this pump class. Consistent body dimensions across QD models mean installation contractors work with familiar footprints on repeat projects. Global voltage configurations — standard 220V/50Hz with 110V/60Hz and 220V/60Hz available on request — support export procurement for buyers supplying markets in North America, Southeast Asia, the Middle East, and beyond from a unified product platform.

Primary Applications

The QD multistage submersible pump is well-suited to a broad range of clean water and lightly loaded water handling tasks:

• Agricultural irrigation from reservoirs, ponds, and storage tanks requiring consistent flow and pressure over vertical distance
  
  
• Residential and commercial building water supply pressurization and distribution
  
  
• Construction site dewatering during excavation, basement flooding, or post-storm water removal
  
  
• Light industrial process water transfer in manufacturing and processing environments
  
  
• Water tower and cistern supply where consistent pressure is required over significant elevation differences
  
  
• Fire-fighting booster circuits in smaller commercial and industrial installations

Business Value

For B2B buyers and distributors, the QD series multistage submersible pump offers a consolidated sourcing platform across 14 models covering rated flows of 3, 10, and 15 m³/h with heads from 32 to 112 meters — addressing agricultural, residential, and light commercial specifications from a single product family without managing multiple product lines. Cast iron construction and multi-stage hydraulics position the QD pump in the durable mid-market segment where engineering depth and consistent build quality drive repeat procurement decisions. Shared dimensional footprints across single-phase and three-phase variants reduce stocking complexity and simplify after-sales support for distributors managing diverse installed pump populations.

FAQ

Q: What is the maximum head the QD multistage submersible pump can reach?
The Q3-112/7-3 three-phase model delivers up to 112 meters of head. Across the full QD range, head outputs start at 32 meters on the entry-level model and scale progressively with stage count, covering most standard irrigation and building water supply pressurization requirements.

Q: Can the QD electric submersible pump handle water with suspended solids?
The QD series is rated for clean to lightly loaded water, with solid impurity content not exceeding 0.1% by volume and particle diameter below 0.2mm. Applications with significant suspended solids or slurry content require a purpose-built dirty-water or slurry pump rather than the QD multistage series.

Q: Is the QD series pump available in 60Hz configurations?
Yes. 110V/60Hz and 220V/60Hz versions are available on request, making the QD submersible drainage pump suitable for supply chains serving North American, Japanese, and other 60Hz markets. Specify the required voltage and frequency configuration when placing your order.

Q: What is the maximum immersion depth for QD series pumps?
The rated maximum immersion depth is 5 meters. Applications requiring greater submersion should verify cable length requirements against the specific installation design before ordering. Standard cable length supports typical fixed installation depths encountered in agricultural and building supply applications.

Q: What liquid type is the QD multistage pump designed for?
The QD series handles clean water and lightly contaminated water within the specified pH range of 6.5 to 8.5 at liquid temperatures up to 40°C. It is not designed for chemically aggressive media, high-temperature fluids, or water with abrasive particulate content above the rated threshold — those applications call for a pump specifically rated for those conditions.