Rubber Duckbill Check Valve for Sewage, Stormwater and Wastewater Systems
Backflow in sewage and stormwater systems causes flooding, contamination, and damage to upstream infrastructure. A rubber duckbill check valve operates entirely on differential pressure, opening under forward flow and sealing tight when back pressure develops, with no mechanical parts, no power source, and no manual intervention required.
Prevents backflow in sewage, stormwater, and wastewater. Tough rubber valve that seals tight and needs no maintenance for long-lasting use. We supply the full Series 700 ProFlex rubber check valve range including flanged, sleeved, inline, jacketed, and low-headloss configurations across a wide size range for varying site and flow conditions.
At Dutco Tennant LLC, we source duckbill check valves and wastewater flow control solutions from established international manufacturers for municipal, industrial, and infrastructure projects across the UAE and GCC, covering all wastewater check valve requirements across the region's most demanding applications.
Zero Moving Parts, Total Backflow Control
- Operates as a fully passive non return duckbill valve, requiring no external power, actuators, or manual assistance at any point
- All-rubber construction resists abrasive sewage slurries, grit, and solid debris without jamming or binding
- Bill seals tightly around solid obstructions, preventing the duck bill valve from being held open by debris in service
- Barnacle and algae-resistant neoprene construction suits tidal, coastal, and submerged outfall installations
- Available in EPDM, nitrile, natural rubber, and NSF/ANSI certified elastomers to match specific media and site requirements
Technical Capabilities Across the Range
- Passive Operation: The valve duckbill functions solely on inlet and back pressure, eliminating the need for power supply, control systems, or scheduled actuation
- Solid Handling: All-rubber bill seals around large solids and debris without jamming, directly replacing flap check valves that seize, rust, and bind in service
- Elastomer Options: Available in neoprene, EPDM, nitrile, natural rubber, CSM, and chlorobutyl with NSF/ANSI certified materials for potable water applications
- Anti-Inversion Support: IVS construction available for high back pressure and vacuum conditions, providing anti-inversion protection without obstructing bore flow
- Fire Retardant Construction: All proco valve variants are fire retardant and will not freeze or deform under extreme operating temperatures
Types
Rubber Duckbill Check Valve
A rubber duckbill check valve that bolts directly onto existing or new flanges for permanent end-of-pipe and outfall installations.
- Full port concentric design supplied with stainless steel retaining rings and multiple international flange drilling standards
- Square and rectangular flange options available for direct sluice gate and flap gate replacement
- IVS option available for elevated back pressure and vacuum resistance requirements
ProFlex Rubber Check Valve
A ProFlex rubber check valve that fits directly inside an existing pipe, installed between existing pipe flanges without requiring a separate valve body.
- Flat face rubber flange eliminates the need for additional valve body hardware during installation
- Suits retrofit applications where external pipe modification is not practical or permitted
- Available with IVS construction for high back pressure and anti-inversion requirements
Wastewater Duckbill Valve
A slip-on wastewater duckbill valve that clamps directly over an existing pipe end using heavy-duty stainless steel clamps.
- Installs in both vertical and horizontal orientations without structural modification to the pipe
- Suits oval and rectangular pipe configurations in addition to standard circular profiles
- Patented sloped bottom design eliminates standing water accumulation inside the valve
Non Return Check Valve
A non return check valve secured inside an existing pipe bore with a stainless steel internal expandable clamp.
- Installs entirely within the pipe without requiring end-of-pipe access or external structural alteration
- Suits retrofit installations where external pipe access is restricted or unavailable on site
- IVS construction available for elevated back pressure and vacuum resistance conditions
Flex Check Valve
A flex check valve with a fold-away inner sleeve providing near full port flow and rapid drainage for flood control and infrastructure applications.
- Installs without modification to existing structures, removing the need for costly pre-installation civil works
- Suited to combined sewer overflow systems, airport runoffs, highway drainage, and railway washouts
- Low cracking pressure prevents upstream flooding while maintaining a sealed position under back pressure
Standout Features & Benefits
Maintenance-Free Service Life
- No mechanical components means no corrosion, no seized gates, and no binding in open or closed positions
- All-rubber construction delivers an extended service life in continuous submerged service conditions
- Eliminates scheduled maintenance visits, reducing long-term operating costs across the full installation life
Reliable Sealing Around Solids
- Bill closes tightly around solids, rags, and debris without manual intervention or system shutdown
- Self-clearing operation removes lodged material automatically during normal forward flow cycles
- Outperforms rubber flap valve alternatives that accumulate fouling and require frequent clearing
Silent, Low-Disturbance Operation
- No hinges, swing gates, or mechanical closures eliminates water hammer and pressure surges during operation
- Quiet closure prevents the banging and impact loading common with traditional valve check valve installations
- Will not freeze or deform in low-temperature operating conditions, returning to full operation upon thaw
Direct Replacement for Flap Gates
- Drops into existing flange, sleeve, or inline positions as a direct replacement for failed duckbill non return valve and flap gate installations
- Multiple connection styles cover flanged, sleeved, jacketed, and inline mounting requirements from one range
- Rubber check valves reinforced with polyester tire cord maintain structural integrity under continuous flow and back pressure cycling
Application Area
Municipal Wastewater and Sewage Systems
- Sewage treatment plant outfalls use the sewage check valve to prevent tidal and stormwater backflow into the collection network
- Combined sewer overflow systems block river water ingress during high-tide and storm surge events
- Wet wells and pump stations benefit from passive backflow protection without power dependency during outages
Stormwater and Flood Control Infrastructure
- Airport runways, highway drainage channels, and railway washout systems use the wastewater duckbill valve to prevent upstream flooding
- Low cracking pressure allows rapid drainage during storm events while maintaining a sealed position at all other times
- Coastal and outfall installations benefit from barnacle-resistant neoprene construction in submerged tidal conditions
Industrial and Process Facilities
- The non return check valve handles abrasive slurries, process effluent, and chemically aggressive media across industrial outfalls
- Aeration systems in wastewater treatment tanks use duckbill valves to prevent sludge backflow into air header pipework
- Elastomer selection covers media compatibility across mining, chemical processing, and industrial discharge applications
Infrastructure and Civil Projects
- Detention ponds, site drainage, and hydrostatic pressure relief applications use the duck bill valve across civil infrastructure projects
- Corroded or seized rubber flap valve and flap gate assemblies are replaced without civil modification using sleeved or inline variants
- NSF/ANSI certified variants suit potable water holding tanks and reservoir overflow pipe applications
FAQ
How are duckbill check valves different from traditional flap check valves?
Duckbill check valves provide a flexible sealing mechanism that adapts to flow conditions, unlike flap check valves or rubber flap valve designs that rely on mechanical movement and may require more upkeep.
Can a rubber check valve be used in corrosive environments?
Yes, rubber check valves are suitable for handling corrosive or aggressive media when the correct elastomer material is selected based on the application.
What is the advantage of using a duck bill valve in wastewater systems?
A duck bill valve offers reliable backflow prevention in demanding applications such as wastewater check valve systems, ensuring smooth discharge without mechanical interference.
Is a duckbill non return valve suitable for flood-prone areas?
Yes, a duckbill non return valve is commonly used in drainage and outfall locations to help reduce the risk of reverse flow during high water levels.
How does a flex check valve improve flow performance?
A flex check valve allows near full-bore flow during discharge, reducing head loss while still maintaining effective sealing under reverse pressure conditions.
Are ProFlex rubber check valves compatible with existing systems?
Yes, ProFlex rubber check valve solutions are designed to integrate with various piping systems, making them suitable for both new installations and system upgrades.
