Corrosion Resistant Maintenance Free Duckbill Check Valve with ZTC Certification for Waterproof Systems
Rubber Expansion Joints Manufacturers provide a full range of high-quality rubber expansion joints and duckbill check valves from DN50 to DN3000, designed for reliable performance in water supply, wastewater, irrigation, and industrial pipeline systems. Our rubber expansion joints are engineered to absorb vibration, reduce noise, and compensate for thermal movement or misalignment, ensuring long-term protection of pumps and piping equipment. The duckbill check valve offers a simple, maintenance-free solution for backflow prevention, using its flexible rubber "duckbill" outlet to allow forward flow under pressure and instantly seal when flow reverses.
- 100% full rubber structure, which can meet various anti-corrosion requirements (different rubber materials can be selected according to the actual demand)
- No blockage and excellent sealing performance
- Long service life, no fault and maintenance free operation
- No moving parts or mechanical components, eliminating noise and manual operation requirements
- Low opening pressure - valve can open with water head more than 0.01M
- Minimizes head loss in pipeline systems
- Flexible installation options to meet customer requirements
- Convenient installation with low cost and operational expenses
| Pipe Size ID | Length | Height | Flange Outside Diameter |
|---|---|---|---|
| DN(mm) | NPS | L(mm) | H | A |
| 50 | 2 | 150 | 100 | 150 |
| 80 | 3 | 220 | 140 | 200 |
| 100 | 4 | 250 | 200 | 225 |
| 150 | 6 | 340 | 265 | 275 |
| 200 | 8 | 420 | 325 | 338 |
| 250 | 10 | 520 | 425 | 400 |
| 300 | 12 | 620 | 525 | 485 |
| 350 | 14 | 700 | 625 | 525 |
| 400 | 16 | 800 | 725 | 588 |
| 450 | 18 | 900 | 825 | 625 |
| 500 | 20 | 980 | 925 | 688 |
| 600 | 24 | 1120 | 1025 | 800 |
| 700 | 28 | 1180 | 1125 | 969 |
| 800 | 32 | 1350 | 1400 | 1080 |
| 900 | 36 | 1500 | 1525 | 1150 |
| 1000 | 40 | 1600 | 1725 | 1325 |
| 1200 | 48 | 1840 | 1950 | 1485 |
- Competitive factory pricing
- 17 years of manufacturing experience with 5 years of export experience
- Strict quality inspection exceeding industry standards
- Customization and OEM services available for various specifications
- Free samples available upon request
- Large inventory for quick delivery
The duckbill check valve features an integrated flange design for easy installation. Its all-rubber construction prevents blockage and jamming while allowing solid particles to pass through smoothly, reducing maintenance costs. Primary applications include:
- Waterproof systems
- Drainage systems
- Pump outlets
- Lifting pump stations
- Submerged aeration systems
- 24-hour customer support
- Free product samples
- Customization services
- Technical drawings provided
- Multiple payment options
- Factory inspection services (material, specifications, quantity, pressure, packaging)
- Extended warranty period
- Secure packaging for transportation
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