Duckbill Check Valves
Backflow Prevention · Maintenance Free
High-performance duckbill check valve, manufactured with advanced technology
✓ Excellent sealing performance ✓ Corrosion-resistant materials ✓ Long-lasting durability ✓ Easy installation
Duckbill Check Valves
Discover our comprehensive range of duckbill check valves designed for superior backflow prevention and reliable performance in various applications.
Technical Specifications
| Available Sizes | 20mm to 3000mm (DN20 to DN3000) |
| Rubber Material | EPDM, NBR, CR, NR, VITON, etc. |
| Flange Material | SS316, SS304, Carbon Steel, etc. |
| Flange Standards | PN16, PN10, PN16, Table D, Table E, ANSI 150#, ANSI300#, etc. |
How to choose the right duckbill check valve？
Select the product according to the location of the product in the pipeline.
For installations at the end of discharge pipes
Clamp Type
Easy installation with clamp connection
Flanged Type
Secure flanged connection for permanent installation
For installations inside existing pipe systems
Internal Clamp Type
Insert into existing pipe with clamp connection
Internal Flanged Type
Flanged connection within pipe system
Flat Bottom Clamp
Low profile clamp design
Flat Bottom Flanged
Low profile flanged design
Key Selection Factors
Installation Method
Consider pipe end vs. in-line installation requirements
Connection Type
Choose between clamp or flanged connections based on pressure and permanence
Application Environment
Consider pressure ratings, flow rates, and environmental conditions
Connection Type Comparison
| Type | Application Scenarios | Structure/Connection Method | Advantages | Disadvantages |
|---|---|---|---|---|
| Clamp Type | Plastic pipe terminals (PVC/HDPE) Hose connections Steel pipe terminal + sleeve Space-limited applications Low-pressure systems | Flanged valve body + metal/plastic clamp secured to smooth pipe end |
✓
Rapid installation
✓
Low cost
✓
Lightweight
✓
Hose-compatible
|
×
Limited pressure rating (≤0.6 MPa)
×
Clamp quality critical
×
Requires straight pipe end
|
| Flange Type | Steel/ductile iron pipelines Pressure lines (pump discharge) High-pressure applications Large diameters (DN≥200) Mid-pipe check valve | Prefabricated standard flange (GB/DIN/ANSI) Bolted connection to pipeline flange |
✓
High pressure capacity (1.6MPa)
✓
Reliable sealing
✓
Universal application
✓
Robust
|
×
Complex installation (bolt alignment)
×
Higher cost (paired flanges)
×
Heavy weight
|
| Internal Clamp | Embedded concrete structures (manholes/tank walls/floors) Submerged outlets Flush wall requirements | Internal installation Valve inserted into opening Secured with internal clamps/bolts |
✓
External flush surface
✓
Ideal for submerged conditions
✓
Space-efficient
|
×
Internal access required
×
Seal dependent on wall treatment
×
Difficult maintenance
|
| Internal Flange | Embedded concrete structures (same as left) Higher pressure/larger valve applications | Flanged valve body Through-wall bolts Secured from inside wall surface |
✓
Max. strength (2.5MPa)
✓
Superior sealing (gasket+flange)
✓
External flush surface
|
×
Most complex installation
×
Mandatory internal access
×
Precise opening required
|
| Flat Bottom Type | Sump/pump pit bottoms Grade-level discharge points No vertical pipe/wall applications | Base plate flange Anchored with expansion bolts Directly to horizontal surface (concrete/steel) |
✓
No pipe/wall required
✓
Flexible positioning
|
×
Prone to sediment buildup
×
Requires level foundation
×
Bolts need corrosion protection
|
Industrial Applications
Duckbill check valves are widely applied across various industrial sectors, providing reliable fluid control solutions for different industries.
Water Treatment
Chemical Industry
Food Processing
Pharmaceutical
Marine Industry
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