Duckbill check valves are a type of check valve commonly used for drains, sewers, and raw water applications. They are designed to open and close with minimal pressure, making them extremely versatile. Besides being a simple and inexpensive method of preventing backflow, they are also very efficient in providing maximum flow and minimum pressure drop.
Duckbill check valves are constructed with an elastomeric rubber that is flexible and resilient. The inner sleeve of the valve is made of fabric-reinforced elastomer. They are available in slip-on, clamp, and flange styles. They have high resistance to chemicals, are low maintenance, and require no electrical or mechanical assistance to operate.
A Duckbill check valve is an inline type of check valve, which means that it is installed directly into a pipe. The valve is generally designed to work with pipes with a smaller outside diameter, which allows it to fit inside a larger pipe. It can also be installed on vertical pipes. It is easy to install and can be fitted into a wide variety of devices.
A duckbill check valve usually has a beak-shaped appendage, which opens and closes when the flow of a liquid is greater than the rubber check valve pressure of the pipe. Its design is very versatile and has been used for over a hundred years. Its main purpose is to prevent contamination from backflow, which is very common in wastewater systems.
Duckbill check valves are typically made of natural rubber or synthetic elastomer. They are durable and can withstand up to 15 meters of backpressure. They are also highly resistant to most chemical compounds found in wastewater. They are a very effective way of reducing the risk of saltwater intrusion into a drainage system. They can be used to control back pressure in a sewage, sludge, or wastewater treatment plant.
There are three types of duckbill check valves. These include the straight bill, curved bill, and the inline duckbill. Each type has its own advantages. For example, the curved bill provides 50% more sealing area. However, it can be more susceptible to debris, while the straight bill model may be affected by debris.
There are also various factors to consider when choosing a duckbill check valve. Some of these factors include the location, the type of application, and the material of the check valve. Having all these things in mind, it will be easier to decide which type of check valve will be suitable for your needs.
When buying a duckbill check valve, choose one that is made of high-grade elastomers. The elastomers used to make duckbill check valves are very flexible and will seal very tightly around obstructions. They are also very resilient and will not rust.
These valves are very reliable and will last for several decades. However, they are not suitable for all applications. They should be used carefully, as they can be damaged during installation or transportation. They should also be inspected often in outdoor use.