Xiamen Better Silicone Rubber Co., Ltd

Hot: Umbrella Valve, Duckbill Valve, Flapper Valve, Silicone Valve & Rubber One Way Valve

Duckbill Umbrella & Duckbill Flapper Combination Valve

Views: 396     Author: Site Editor     Publish Time: 2021-08-04      Origin: Site

Duckbill Umbrella & Duckbill Flapper Combination Valve

Duckbill umbrella valve & duckill flapper valve are combination valve which function as two way flow control valve, bidirectional valve. Duck bill umbrella valve refer to the valve with a duckbill valve in one side and a mushroom valve in another side while duckbill flapper valve is combined by a duckill walve and a flapper check valve. They are made of FDA / LFGB approved silicone material, widely used for sealing, flow controlling, liquid dispensing & air releasing.

duckbill umbrella valveDuckbill Flapper Valve

Duckbill Umbrella Valve Working Principle

Duckbill umbrella combination valve can be applied in two different ways. Like in fuel tank, when fuel consumed, the duckbill valve lets air in the tank at low-pressure differential in order to replace the fuel and prevent from creating a vacuum in the tank. When the tank is held upside down, the duckbill closed and prevents fuel dripping out. When the tank gets hot, the umbrella valve opens and vents the gases to atmosphere. Another is duckbill valve and the umbrella valve directing the flow to separated conduits. In this way duckbill umbrella valve provides two valve functions. Umbrella opens up in the inlet stroke and at the outlet stroke, the umbrella closed and the fluid is directed through the duckbill valve. This is a convenient way to make a diaphragm pump

duckbill umbrella valve working principle

Duckbill Umbrella Combination Valves

Duckbill Umbrella / Flapper Combination Valve Design 

Duckbill umbrella / flapper combination valve is available in various elastomer material, including medical and food-grade silicone, liquid silicone rubber (LSR) for bottle cap, dispensing closure and hydrocarbon-resistant fluorosilicone rubber (FVMQ) to fit a broad range of media and temperatures for fuel tank. 

Also EPDM, Buna N & Nitrile Rubber, Neoprene / CR, Fluorocarbon rubber (FKM, FPM, Viton) can be chosen to make two way contrl valve.

 Structure Design

  • Angle & Width of rubber duckbill valve end: A certain width needed for rubber duckbill check valve positioning and die cutting proceeding. Meanwhile, if it is a sharp angle at the end, it is easy to cut inaccurately.

  • Size of slit & lip: The longer the length of slit, the easier it will be opened under certain pressure. But it will not easy to close. 

duckbill umbrella valve for liquid dispensing

  • Duckbill Flapper Combination Valve: Flapper check valve can be level with one of the two sides to reduce the complexity of machining process and save mold and die cutting position tool price.

duckbill flapper combination valve design

Duckbill Umbrella / Flapper Combination Valve Quality Control

Common Defect: 

Burrs & Material Loss in Valve Slit 

The problem generally caused by not enough sharp die-cutting tools. With blunt tool, the duckbill check valve slit is easy to have flashing in the slit and even make the slit into a gap, fully opened. Operation staff operating techniques can also affect whether the slit can be cut well. Generally, the slit should be cut perfectly the first time. It will leave burrs if proceed second cutting.

duckbill umbrella combination valve Quality

Slit Close” Problems for Combination Valve

The burrs will lead to unclosed slit

The material restoring force will also affect the slit close


Using sharp die cutting tools & Proper positioning of rubber duckbill check valve in die cutting process.

Choosing high-elastic silicone rubber material so that the slits of one way check valve can open & close easily.

Duckbill umbrella valve

duckbill umbrella combination valve manufacturer

We not only provide custom made silicone valve but also offer off-the-shelf wholesale rubber valve

Contacts with us

  86-18159020626
Do you have 3D drawing or sample? so that we can estimate the price for you.You can contact me at my e-mail address:
 Room No. 513-515, 5F, Culture Creative Park,
No.10 Huli Avenue, Huli District, Xiamen, China.(office)
 2F, No. 165, Tong'an Park, Industry cluster zone, Tong'an District, Xiamen, China (factory)
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