Frequently Asked Questions
Find answers to common questions about DONGTAO pumps, motors, and services
Can’t find what you’re looking for? Contact our support team
Product Questions
DONGTAO pumps feature our proprietary Full Head, Wide Voltage technology. Unlike traditional pumps, our products can operate efficiently at any lift from zero meters to maximum head, and tolerate voltage fluctuations (Single-phase: 160V-230V; Three-phase: 330V-380V). This makes them ideal for areas with unstable power supply.
We manufacture a comprehensive range including:
- Submersible Pumps: Multi-stage, Oil-Immersion, Stainless Steel, Seawater
- Sewage Pumps: Iron shell, Stainless steel, Non-clogging
- Self-Priming Pumps: Intelligent automatic, Centrifugal, Sewage
- Pipeline Pumps: Centrifugal models for building systems
- Motors: Single-phase and Three-phase asynchronous motors
Yes! We offer specialized Q(D)X Stainless Steel Seawater Pump Series featuring:
- Stainless steel shafts and housings
- Silicon carbide mechanical seals for corrosion resistance
- Fluor rubber (FKM/Viton) O-rings
- Full head and wide voltage operation
With proper installation and maintenance, DONGTAO pumps typically last 5-10 years in standard applications. Our durability comes from:
- National Standard Y2 motors
- Premium brand bearings
- Dual mechanical or O-ring seals
- High-quality materials (stainless steel, cast iron)
- Rigorous factory testing
Technical & Specifications
Our model numbers follow a logical pattern:
- Prefix: Pump type (Q=Submersible, WQ=Sewage, BZ=Self-priming, etc.)
- First Number: Flow rate in m³/h (e.g., 3, 10, 15)
- Second Number: Head in meters (e.g., 20, 30, 50)
- Third Number: Motor power in kW (e.g., 0.75, 1.1, 2.2)
- Suffix: Material/Special features (G=Stainless Steel, S=Seawater)
QD3-33/2-0.75 = Single-phase submersible, 3m³/h flow, 33m head, 2 stages, 0.75kW.
Key parameters to consider:
- Flow Rate: Required water volume (m³/h or L/min)
- Total Head: Vertical lift + friction losses (meters)
- Power Supply: Single-phase (220V) or Three-phase (380V)
- Fluid Type: Clean water, sewage, chemicals, seawater
- Installation: Submersible, surface, or self-priming
- Operating Hours: Continuous or intermittent duty
Our technical team can assist with selection – contact us with your requirements.
Regular maintenance ensures optimal performance:
- Monthly: Check for unusual noise/vibration, verify power supply
- Quarterly: Inspect seals for leaks, clean intake screens
- Annually: Check bearings, test motor insulation resistance
- 2-3 Years: Replace mechanical seals (depending on usage)
- As needed: Replace worn impellers or casings
Detailed maintenance schedules are provided in product manuals.
Yes, we provide comprehensive documentation for all products:
- Detailed technical datasheets (PDF)
- Performance curves (flow vs. head)
- Dimensional drawings (CAD/DWG format available)
- Installation and operation manuals
- Wiring diagrams
- Material certifications upon request
These are available for download on our website or by contacting our sales team.
Ordering & Pricing
You can request a quote through:
- Email: Send your requirements to sales@dongtaomechanical.com
- Phone: Call 400-990-8882 during business hours
- Website: Use the contact form on our website
Please include: Product model, quantity, destination port, and any special requirements.
Our MOQ policy varies by product:
- Standard Products: 1-10 units (depending on model)
- OEM/ODM Projects: Typically 50+ units
- Custom Designs: Negotiable based on tooling costs
- Sample Orders: Available for most products (1-2 units)
Contact us to discuss your specific quantity requirements.
Yes, we offer tiered pricing for larger orders:
- 1-10 units: Standard pricing
- 11-50 units: 5-8% discount
- 51-200 units: 8-12% discount
- 201+ units: 12-20% discount (negotiable)
- Annual Contracts: Additional discounts for committed volumes
Exact discounts depend on product model and order value. Contact sales for detailed pricing.
We offer flexible payment options:
- T/T (Telegraphic Transfer): 30% deposit, 70% before shipment
- L/C (Letter of Credit): Accepted from reputable banks
- Western Union/MoneyGram: For small orders
- PayPal: For sample orders (subject to fees)
- Trade Assurance: Available through Alibaba
All terms are negotiable based on order value and customer history.
Shipping & Delivery
Delivery times vary by order type:
- Standard Products (in stock): 3-7 days for domestic China, 7-15 days international
- Standard Products (to produce): 15-30 days
- Custom/OEM Products: 30-60 days (depending on complexity)
- Samples: 7-10 days
Note: International shipping times depend on destination and shipping method.
We work with multiple shipping providers:
- Express: DHL, FedEx, UPS, TNT (3-7 days worldwide)
- Air Freight: 7-15 days (economical for larger orders)
- Sea Freight: 20-45 days (most economical for large volumes)
- Rail: China-Europe Railway Express (15-20 days to Europe)
- Domestic China: Various trucking and logistics companies
We’ll recommend the most cost-effective method based on your order.
We provide comprehensive shipping support:
- Export Documentation: Commercial Invoice, Packing List, Bill of Lading/Airway Bill, Certificate of Origin
- Export Declarations: We handle all China export formalities
- Insurance: Available for goods in transit
- DDP Service: Door-to-Door delivery including destination customs clearance (available for most countries)
- DAP/FOB/CIF: Various Incoterms available
Our logistics team will guide you through the process.
Support & Warranty
Standard Warranty: 12 months from shipment date
- Covered: Manufacturing defects in materials and workmanship
- Not Covered: Normal wear and tear, improper installation, misuse, lack of maintenance, operation outside specifications, water damage to motors
- Extended Warranty: Available for OEM customers (up to 24 months)
Warranty claims must be supported by proof of purchase and proper installation/maintenance records.
Our technical support includes:
- Pre-sales: Product selection assistance, application consulting
- Installation: Wiring diagrams, installation manuals, video guides
- Troubleshooting: Phone/email support for operational issues
- Spare Parts: Genuine replacement parts with 2-3 year availability
- On-site Support: Available for large projects (cost may apply)
- Training: Product training for distributors and large customers
Contact: 400-990-8882 (Mon-Fri, 8:00-18:00 China Time) or support@dongtaomechanical.com
Yes, we maintain a comprehensive spare parts inventory:
- Common Parts: Seals, bearings, impellers, shafts (available from stock)
- Motors: Complete motors and components
- Electronic Controls: For GJ intelligent pump series
- Lead Time: Stock items: 2-5 days; Non-stock: 15-30 days
- Parts Support: We commit to supplying spare parts for 5+ years after product discontinuation
Provide your pump model number for quick parts identification.
Still have questions?
Our team is ready to help with any inquiries about our products or services.
Phone: 400-990-8882
Email: sales@dongtaomechanical.com
Hours: Mon-Fri, 8:00-18:00 (China Time)
