Duckbill Check Valve Supplier in Australia

Duckbill Check Valves available with free delivery Australia wide*. We supply Duckbill check valve products to all cities in Australia, Perth, Adelaide, Melbourne, Sydney, Brisbane, Darwin, Canberra, Hobart and more.

We are a professional supplier and distributor of Duckbill Check Valve products in Australia.

General size range DN80 - DN1700.


Facts about Duckbill Check valves:

  • Available in different styles such as Slip on, Flanged and Inline.
  • Rubber Duckbill valves are a check valve installed at the end of a pipe to prevent back flow. Mainly to prevent flooding when water levels rise.​
  • Duckbill check valves are manufactured from high quality durable rubber. These valves are incredibly reliable compared with older style flap gate valves and do not seize.
  • Commonly fitted to a headwall outfall, and drainage pipeline.
  • When the full volume and flow rate passes through a duckbill check valve, the valve is fully opened to the shape of a circular pipe, and returns to the closed position when flow stops.
  • The opening and closing function of the valve requires no maintenace.
  • On horizontal pipes, duckbill check valves must be installed vertically with the valve outlet positioned vertically up and down.

​General information on Duckbill Check valves:

  • ​We sell 3 different types of duckbill check valves. The slip on model which is fitted over the top of the end of a plain ended pipe and secured on with a stainless steel clamp. The flanged duckbill check valve will connect onto the end of a flanged pipe spool. The inline duckbill check valve fits inside a pipe and is not visible from the outside.
  • The rubber used to construct the valve is a flexible elastomer like a truck tire. The valve is designed to have a large sealing area which tightly seals when required to. These valves can typically withstand upto 15 meters of back pressure.
  • The Straight Bill Duckbill Check Valve will open with as little as 25mm of water pressure, equivalent to 0.248 kPa.
  • The rubber used on these valves provides continual corrosion resistance. The outer layers of Neoprene rubber repel marine organisms which eliminates marine fouling issues.
  • The design prevents logs or other floating objects from entering the valve closing mechanism, therefore the valve will always close when required to, no matter what the environment may throw at it. 
  • Neoprene is the best rubber for Ozone sunlight protection, and stops barnacle growth and sea weed build up.
  • Rubber material options available include Neoprene, EPDM, Viton, NBR, Natural Rubber for many applications.
  • The duckbill check valve is easy to install and remove either by slipping over the end of the pipe and tightening a couple of fasteners, or by mating with a flange and fasteners.
  • Designed to suit any situation, with custom built solutions.

The purpose of Duckbill Check valves:

  • Rubber duckbill check valves protect the environment from flash floods and other natural causes of floods.
  • The rubber check valve eliminates maintenance costs due to the versatile inline back flow prevention design.
  • No mechanical moving parts meaning no possibility of corrosion or failure.
  • The duckbill check valve has the lowest head loss of any check valve, enabling the valve to open with very little water, yet closing very easily when required to.
  • The engineered construction allows the valve to open with minimal pressure, and close against a rising tide with no requirement for a power source or manual operation.

Industrial Applications of a Duckbill Check valve:

  • Storm water
  • Waste water sewage treatment plants
  • Industrial treatment plants
  • Highway runoff's
  • Effluent diffuser systems
  • Residential plumbing applications
  • Wet lands
  • Beach protection

The table below provides an overview of the Duckbill Check Valve range of products:

Duckbill Valve Model Size range Rubber Material Options
Flanged Duckbill Check Valve - Flared DN80 (3") - DN1700 EPDM, NEOPRENE, NBR, NATURAL RUBBER, VITON
Flanged Duckbill Check Valve - Flat bottom DN80 (3") - DN1700 EPDM, NEOPRENE, NBR, NATURAL RUBBER, VITON
Slip on Duckbill Check Valve - Flared 88.9mm (3.5") - 1700.0mm EPDM, NEOPRENE, NBR, NATURAL RUBBER, VITON
Slip on Duckbill Check Valve - Flat bottom (DB-1 model) 88.9mm (3.5") - 1700.0mm EPDM, NEOPRENE, NBR, NATURAL RUBBER, VITON
Inline Duckbill Check Valve 80mm (3") - 600mm (24") EPDM, NEOPRENE, NBR, NATURAL RUBBER, VITON

Choosing a Curved Bill or Straight Bill:

- Curved Bill model - provides 50% more sealing area compared to the straight bill ended duckbill check valve, enabling a better tighter seal when debris are present. Does require a slightly higher cracking pressure to open the valve compared to the Straight Bill model.

- Straight Bill model - opens with minimal cracking pressure, if debris are present there is a high chance it will effect sealing performance.

How to install a Slip On Duckbill Check Valve:

  1. The slip on model, easily slips over the outside diameter of the pipe, and is clamped on with the clamp(s) supplied with the valve. This will secure the valve to the pipe.
  2. Using a lubricant, it is recommended to lubricate the inside of the rubber where it will slide over the pipe end. This is to prevent the rubber from any damage during installation.
  3. Measure the section of the valve that will fit onto the pipe, and mark on the pipe with a permanent marker a line where the valve will slide up to. This will ensure the valve is secured on at the right location.
  4. Prepare the end of the pipe if required. It must be clean and not have any sharp edges.
  5. Ensure that the valve is installed in a vertical position, with the opening in a vertical up and and down position. This is how the valve works best.
  6. Position the valve in line with the pipe, lifting equipment may be required for large size models. The clamp(s) may need to be loosened for installation.
  7. Now slide the duckbill check valve over the pipe end into position - up to your marker line.
  8. The clamp(s) supplied with the duckbill check valve can now be tightened, ensuring the clamp(s) are in the correct position. It is important that the clamps get a good hold on the pipe, so that the valve will not fall off the pipe over time. The nuts and bolts should not be over tightened as they will force the clamp to damage the rubber.
  9. Additionally, the slip on duckbill check valve can be pinned to the pipe, by drilling holes through the valve around the pipe and into the pipe and securing with fasteners. This is at the pipe fitters discretion.

How to install a Flanged Duckbill Check valve:

  1. A flanged rubber duckbill check valve can be fitted to a headwall, or pipe flange.
  2. Ensure the flange specification is the same for both the valve and the pipe flange, so that they can be bolted up to each other.
  3. Drill holes in the headwall the same pattern as the flange on the valve. This is essential.
  4. Ensure that the valve is installed in a vertical position, with the opening in a vertical up and down position.
  5. Position the valve flange to line up with the pipe flange or headwall drilling pattern, keeping the valve in the vertical position. Lifting equipment will be required on large sizes.
  6. Mate the valve flange surface to the connecting flange or headwall. 
  7. Insert the fasteners to secure the valve in position. 
  8. Tighten in the required pattern. Over tightening is not required.

How to install an Inline Duckbill Check Valve:

  1. The inline duckbill check valve is fitted to the inside of a pipe. Access to the inside of the pipe is essential.
  2. Ensure that the inside diameter of the pipe is measured, as the outside diameter of the valve needs to be slightly smaller so that it fits inside the pipe.
  3. Ensure the inside of the pipe is cleaned with no sharp edges.
  4. Lubricate the outside of the rubber duckbill check valve so that it slides into the pipe easily and protects it during installation.
  5. When inserting the valve into the end of the pipe, ensure that the valve is installed in a vertical position so that the valve outlet is going up and down, and not side to side.
  6. For a flanged inline duckbill check valve, it is important that the position of the valve doesn't change whilst mating the two pipe flanges together to bolt up, as the duckbill check valve could rotate before the fasteners are installed.
  7. The flanged model of inline rubber duckbill check valve, will be installed with the rubber flange acting as a gasket between the two mating flanges that the valve sits between. Therefore the nuts and bolts should not be over tightened.
  8. Tighten the nuts and bolts around the mating flanges in the required pattern.

Supplying all across Australia - Perth, Adelaide, Melbourne, Canberra, Sydney, Brisbane, Darwin, Hobart.