A duck bill check valve is a type of check valve that is commonly used in marine and water supply applications. They are constructed with a elastomeric material that makes it highly flexible and durable. This material prevents leaks and backflows, which makes them a good choice for a variety of applications.
There are different types of duckbill valves, including the flanged duckbill check valve, the inline duckbill check valve, and the clamp-type duckbill check valve. The flanged type is often suited for sewage, seawater, and raw water. It is also easy to install and remove. The inline model fits inside a pipe, while the slip-on version can be easily fitted to a pipe flange. It is secured by a stainless steel clamp.
In order to determine which kind of duck bill check valve is right for your application, it is important to consider a few factors. First, you need to know the materials used to make the check valve. For example, you can choose between EPDM (rubber) or Neoprene (foam). The hardness of the rubber will affect how strong the check valve is. In addition, the hardness of the material will affect the rebound resilience of the check valve.
In addition to the material, you will also need to consider the flange specification. You will want the flange to fit the pipe flange you are installing it on. This is to ensure that the check valve does not rotate when the pipe flange is mated.
Another factor you need to consider is the size of the slit. Some duck bill check valves are designed with a slit that is narrower, which can be more effective at stopping backflow. However, if you choose to use a slit that is wider, you will need to provide more pressure to close the valve. The higher the cracking pressure, the more the slit will open.
It is also important to keep the duck bill check valve away from heat sources. This will help to protect it from rust and damage. It is also advisable to inspect the valve frequently in outdoor applications.
As with any other type of check valve, the flanges of the duck bill check valve should be properly positioned and lubricated. To keep the flange in place, you will need to tighten the duck bill check valve fasteners to the correct pattern. You should never over-tighten the nuts and bolts on the flange. If this is not done, the duck bill check valve could rotate before the fasteners are in place.
It is also necessary to install the duck bill check valve in a vertical position. This will allow the outlet to remain in the side of the valve. The flange must not be over-tightened, which can wear the rubber. It is also advisable to use a lubricant on the flange before installing the valve.
A rubber duck bill check valve offers a number of advantages, such as durability, flexibility, and high reliability. They are easy to install and require minimal maintenance, which means less cost. They are also great for protecting the environment from natural floods.