If you want to avoid backflow and ensure that your pipes are free of suspended solids, you need to use a rubber duckbill check valve. These are elastomeric devices that are easy to install, operate, and maintain. They also offer an economical alternative to controlling back pressure. They are ideal for a wide range of applications, including wastewater treatment and outfalls.
Rubber duckbill check valves are designed to work with a variety of municipally-pumped media, from water and wastewater to raw and treated water. They are flexible, corrosion-resistant, and resistant to organic contaminants. They provide excellent sealing, and their outer layers are specially designed to repel marine organisms. They are also low maintenance, and require no power source. They are widely used in the water handling and healthcare industries, as well as in food packaging.
They have been used for a number of years. They have gained popularity in recent years as a more efficient and reliable alternative to flapper and swing gate check valves. Besides, they are easy to assemble and maintain, and have low head loss. However, they are not perfect. They may become damaged during transportation or installation. They can also be blocked by vegetation or rocks. Therefore, they should be checked periodically.
Before installing a duckbill check valve, it is necessary to lubricate the flange. It should be tightened in a pattern that is appropriate for the pipe. The valve’s slit should be cut correctly. If the die-cutting tool is blunt, the slit may be prone to leakage. The slit should be cut with a cutting angle of 45 to 55 degrees. This will ensure that no material is left inside the slit.
If the slit is not cut properly, it will not close. The duckbill check valve slit should be cut perfectly the first time. This will prevent the valve from opening in reverse. In order to do this, it is important to have good hold on the pipe. The clamps should be positioned correctly and loosened if needed.
Rubber duckbill check valves come in a variety of sizes and styles. Some are made to slip over a pipe, while others are fitted to a pipe flange. They can also be manufactured with internal vacuum supports, which provide great anti-inversion features. They are also available with a variety of drilling standards. These include ANSI, ASME, AFSA, and AWWA.
Rubber duckbill check valves can be custom-built, and they can be made from a variety of materials. Some of the materials available are medical grade, food-grade, and NBR. They are available in a range of designs, including curved and straight bill models.
Rubber duckbill check valves have proven themselves to be reliable, and they are ideal for a number of different applications. These devices have high rebound resilience, which means that they are able to handle large obstructions. They can also be easily integrated into a number of devices. They are especially useful in the ocean, and are often installed in marine ports and outfalls.