What Is a Duckbill Check Valve?

The duckbill check valve is a common check valve used in a variety of applications. It is typically made of rubber or synthetic elastomer and features two flaps that are shaped like a duck’s beak. Its primary purpose is to prevent backflow, which can lead to contamination.

Typical applications

A duckbill check valve is a one-way valve made of flexible materials. It is often shaped like a duck’s beak and has a flat front end. It functions without human intervention and operates by causing a pressure differential across the valve. When liquid pressure increases, the duckbill check valve opens and lets the liquid through while preventing backflow.

Duckbill check valves are used in many different applications where the flow of fluid must be controlled. They are typically used in backflow prevention, wastewater treatment, and flood prevention. Their duckbill shape and elastomeric material allow them to handle a wide range of fluids and temperatures. These types of valves have a long lifespan, ranging from thirty to 50 years.


A duckbill check valve has several advantages over other types of check valves, such as their fire-retardant construction and ability to withstand high temperatures. However, there are a few important considerations to make before choosing the right one for your application. These include biocompatibility, flammability, leachability, and extractability. Choosing the right material for the application also ensures the valve is suitable for the fluid it is to control.

The material used to manufacture duckbill check valves should be durable. It should be resistant to high temperatures and transportation. It should also be stored away from heat sources to prevent damage. This is especially important if the valve is being used outdoors.


A duckbill check valve is a valve designed to prevent backflow, or the backward flow of fluid. This type of valve is made of rubber and is lightweight and inexpensive. Its main drawback is that it is susceptible to abrasion and can crack easily outdoors. It can also become damaged in high temperatures, so it is important to choose the right valve for your application. ThisĀ official source type of valve should be checked frequently, and you should avoid exposing it to sunlight or heat sources.

A duckbill check valve closes when there is a difference in internal and external pressure. This feature prevents backflow from occurring, preventing water from entering the system. It is suitable for pipes of various diameters, and it can be installed in depths of up to 8 meters. The main material used to make these valves is natural rubber. It can be manufactured with different flange ends to meet various standards. It is also compatible with different types of pipes, including corrugated piping, PVC, cement pipes, and steel pipes.


There are a few key steps involved in the proper installation of a duckbill check valve. The valve needs to be lubricated before installation, and it should be installed in a vertical position with its outlet pointing upward or sideways. Once the valve is installed, it should not rotate when mating pipe flanges are fitted around it. It should also be installed in a tight, secure manner.

There are several factors that determine which type of check valve will best suit the application. The materials used to manufacture duckbill valves are highly resistant to corrosion, as well as fire. In addition to being fire-retardant, they are also made to last for decades. Mechanical disc and ball valves, on the other hand, can be expensive to maintain and can lose components over time.