Clamp type rubber check valve (duckbill check valve)
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Clamp type rubber check valve (duckbill check valve)

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Clamp rubber check valve’s diameter gradually reduce along flow direction, and gradually forming a duckbill shape sealing parts, so it is also called clamp type rubber duckbill valve, belled type duckbill check valve. It adopts clamp to connect and fasten, assembling is more convenient. The connection part of clamp connection rubber check valve is sleeve and pipe, which will insert the sleeve, and fasten with steel clamp, sometimes, the pipe and sleeve inside wall can cover water project glue to seal better. Gasket Should be appropriately applied between the clamp mount, fastening bolts, if the use of auxiliary liner, when connecting, auxiliary liner and reserved pipe should be sealing welded. Please note that the nominal diameter is larger than DN800, the body weight will be very large, when operation, a lot of remain water will be left in the abdominal cavity body and water impact effect, a supporting rod shall be increased. It can prevent flood and waste water to flow backward to sewer and basement, and avoid heavy loss; it can prevent flood to flow backward to waste water plant and drainage pump station; prevent waste water or peculiar smell fluid spread and can drain away water at any time; In rainy season, rubber check valve can prevent the flood of inland river from sewer to street; The quality is better than flap valve, and overcome the uptight close disadvantage of flap valve.

Working Principle

It is a full rubber structure, with "positive inflows reverse backstop" new drainage valve product features. It is calculated based on stress analysis and stress for different conditions, different design mechanisms, use of different rubber formulations, make according to a special process . When forward, the water floods from the inlet and tiny water pressure, will be able to open the valve. The greater of the pressure, the valve opens larger, the greater of the water flow. Reverse work, valve port close naturally, sealed backstop, the larger back pressure, the more tightly of the valve port, sealing the better, maximum back pressure which can be made to withstand varying degrees by an elastic material and the rubber compound.

Product Features

1. Automatically open and close according to pressure differential pressure, safe and reliable, no noise, no need of personnel to operate, no maintenance;

2. Forward turn-resistance, a small start-up pressure and flow naturally adjusted according to the water pressure;

3. Reverse backstop sealed, no leaks, it prevents backflow, the greater the back pressure, the better the results;

4. Anti-corrosion, anti-aging, deformation, adaptability, long service life;

5. A wide range of sizes, nominal diameter DN50 ~ DN3000.

There are two models of clamp connection rubber check valve:

1. Symmetry type, two sides of rubber check valve is symmetry.

rubber duckbill check valve


2. Eccentric type. One side is flat.

Eccentric type


Rubber material usually is Natural rubber and Neoprene rubber. Natural rubber is fit for waste water which includes alkali and acid; Neoprene rubber can wear UV,and fit for outdoor environments.

Clamp material is carbon steel or stainless steel.


Type Nominal dia. of pipe L for length H for height
XF50-158-T 50 158 100
XF80-232-T 80 232 140
XF100-270-T 100 270 200
XF150-360-T 150 360 265
XF200-450-T 200 450 325
XF250-560-T 250 560 425
XF300-650-T 300 650 525
XF350-750-T 350 750 625
XF400-850-T 400 850 725
XF450-950-T 450 950 825
XF500-1060-T 500 1060 925
XF600-1200-T 600 1200 1025
XF700-1200-T 700 1260 1125
XF800-1450-T 800 1450 1400
XF900-1620-T 900 1620 1525
XF1000-1720-T 1000 1720 1725
XF1200-2010-T 1200 2010 1950
XF1400-2280-T 1400 2280 2320
XF1600-2600-T 1600 2600 2650
XF1800-2920-T 1800 2920 2960
XF2000-3150-T 2000 3150 3300
XF2200-3450-T 2200 3450 3580
XF2400-3760-T 2400 3760 3925
XF2600-3900-T 2600 3900 4250
XF2800-4200-T 2800 4200 4580
XF3000-4500-T 3000 4500 4990


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