The working principle, advantages and disadvantages of duckbill valve

A duckbill valve, also called a check valve, is a valve used to prevent liquid from flowing back. The duckbill valve is called a duckbill valve because of its appearance. The entire duckbill valve is like a flat duckbill, so we call this type of valve a duckbill valve. Since the duckbill valve has the magical ability to prevent backflow, then the editor will introduce to you the working principle of the duckbill valve and the advantages and disadvantages of using the duckbill valve. Let everyone use the duckbill valve more clearly next time.

Working Principle

The working principle of the duckbill valve is simple. When the liquid passes through the valve, the valve opens. When the flow or pressure increases, the opening range of the duckbill valve also increases; when the water flow stops, the reverse water pressure or atmospheric pressure will tighten the duckbill valve to prevent the backflow of liquid or odor. The pressure required to open the duckbill valve is very small. Usually, the valve can be opened when the forward and reverse water level difference is 250?Pa. Because the duckbill valve is easy to open and close and has good sealing performance, it can prevent the return of odor and meet the water (gas) sealing requirements of indoor drainage ditches and outdoor drainage pipes. The duckbill valve is a quasi-water sealing device that can also block the return of odor from outdoor inspection wells and solve the problem of sewage backflowing into the room when the water level in the outdoor inspection wells rises.

Duckbill valves can prevent floods and sewage from flowing back into street sewers and basements, thus avoiding major losses. Prevent floods from flowing back into sewage treatment plants and drainage pumping stations when water levels rise. It prevents the spread of the odor of sewage or odorous fluids, and can drain water at any time; in rainy seasons, it can prevent urban inland river floods from pouring into the streets from the sewers. The quality is better than that of the flap door, and it overcomes some defects of the flap door such as lax closing and can effectively block the reverse propagation of sound downstream of the pipeline. Has been widely used.

Advantages of duckbill valve application:

Duckbill valve has low cost. If suitable rubber raw materials are used, its service life exceeds that of metal check valves. It is easy to install and has flexible and diverse installation methods. repair.

(1) Automatically opens and closes according to the water pressure difference, safe and reliable, no noise, no human operation, no maintenance.

(2) The forward opening water resistance is small, the starting pressure is small, and the flow rate is naturally adjusted according to the water pressure.

(3) The reverse backstop is well sealed and has no leakage, preventing backflow. The greater the back pressure, the better the effect.

(4)Wide range of sizes.

(5) Anti-corrosion, anti-aging, strong applicability and long service life.

Disadvantages in the application of duckbill valves:

The rubber body is not suitable for long-term open-air operations in the field, and the use of high-quality rubber cannot avoid aging.

(1) Increase the project cost.

(2) Increase the head loss of the diffuser.

Summary: The editor has introduced some working principles of the duckbill valve to you above. The duckbill valve mainly achieves the function of preventing backflow through different pressures. At the same time, since the duckbill valve is made of rubber, it is best to check the usage environment before using the duckbill valve, because the duckbill valve cannot be used in some places. At the same time, the editor also introduced to you the advantages and disadvantages of duckbill valves, so that everyone can pay more attention when using them.

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