Tideflex Duckbill Valves
The Original Duckbill Valves - Simple, Tough & Trusted to Prevent Backflow.
Installed around the world since 1984.
Low headloss maximises flow
Flexible, durable rubber duckbill design
Curved bill standard >450mm
DN25 -DN2500 standard sizes
Neoprene & EPDM standard construction
Specials possible for clean water/potable water approval
Slip-on or flange/backplate mounting available
PN10, PN16 or
other drilling on flanged valves
1 yearwarranty standard - 3 & 5 year available
25+ year design life
Tideflex Valve Models
Flat-bottomed duckbill valve with back plate for easy installation.
Flared duckbill valve with back plate for easy installation.
Flat-bottomed slip-on valve to connect directly to exposed plain-end pipe.
Flat-bottomed flanged valve to bolt directly to headwall or flanged pipe.
Flared slip-on valve to connect directly to exposed plain-end pipe.
Flared flanged valve to bolt directly to headwall or flanged pipe.
The choice of valve model depends on a number of factors including location, connection design, hydraulic requirements etc. The mounting option for the same valve body shape and size has no bearing on the back pressure rating of the valve. We have over 20 years practical, real-world experience with Tideflex valves. Contact us for advice and recommendations.
How Tideflex Duckbill Valves Work
About Tideflex Valves
The Tideflex duckbill check valve is a revolutionary design for backflow prevention in drain and sewer systems for wastewater and stormwater drainage. Tideflex non-return valves are the original duckbill valves consisting of a one-piece rubber matrix of numerous natural and synthetic elastomers and ply reinforcement, similar in construction to a truck tyre. The one-way valves operate using line pressure and back pressure to open and close, so no outside energy source is required.
The Tideflex check valve has an extremely low cracking pressure so the valve is self-draining which eliminates standing water and maximizes storage volume (attenuation) in the upstream drainage system. The flat bottom of the TF-1 valve means that it requires less bottom clearance - this means that it can be installed at a lower elevation and thus improve the system driving head. It also eliminates the need to rotate the valve to install it; something that causes several issues and can lead to gaping. The increased bill height of the TF-1 means that the effective open area of the valve is greater and so reduces headloss and improves hydraulic performance compared to standard duckbill valves.
Tideflex check valves are self-clearing of debris and seal tight around obstructions, which makes them an excellent choice for use as a tidal valve on
Since Tideflex duckbill valves are normally closed, only opening with water differential pressure, they discourage unauthorised access to outfalls, especially on larger sizes.
Tideflex one-way valves are simple and reliable alternatives to ineffective drainage flap valves and tidal flap valves because they are constructed out of reinforced rubber. Therefore there are no moving parts that can corrode, warp or freeze. Tideflex valves will handle large obstructions without jamming, and there is no gate to be stuck open. This provides peace of mind for stormwater and combined sewer overflow systems designed to provide flood protection for low-lying areas.
Tideflex non-return valves are available in asymmetrical (flat bottom) and inline (CheckMate) models
Drainage systems need to be reliable in the long term and meet the design intent 100% of the time, no matter the weather - don't accept second-best when you cannot afford the consequences.
We stock valves made of Neoprene with EPDM wrapping, but other elastomers are available on request for various applications. Neoprene offers excellent resistance to a wide range of effluent substances encountered under general operating conditions, including hydrocarbons, fats, oils, grease, kerosene and methane, while EPDM is chosen for its robust abrasion and UV resistance.
Tideflex also produce valves for clean water/potable water use with NSF certification.
Tideflex check valves have been exposed to extensive independent hydraulic testing since the 1980s and continue to be improved through research and development and ongoing in-house testing along with field studies to validate
Contact us for more information. There are also numerous documents available on our site for download which provide more detailed information. Let us assist you in writing a strong technical specification to ensure you get the product you