rubber check valves
1.sizes:DN25mm~DN5000mm
2.parts:rubber,hoop
3:material:rubber,stainless steel
4:ISO9001,ISO14001

rubber check valves,rubber duckbill valve,rubber expansion check valve

flange flexible duckbill check valves made in our company have been constantly receiving ruputation not only home but also abroad. These valves are our special product , and it is used for draining sewage. we are doing our best to make our product more practical and perfect. The valves can be matched with straight pipe,flange pipe,cement pipe and so on. Meanwhile ,it is environmental.

1. Product properties:

The advantages are specially marked in comparison with traditional flap valves:

a)  open and close automatically in security and reliability according to hydraulic difference without noise and in no need of operator and maintenance;

b)  positive start has little water resistance and start -up pressure and the flow can be adjusted naturally according to hydraulic pressure;

c)  reserve cut-off has good seal without leakage to prevent from flowing backwards, the back pressure is higher and the effect is better;

d)  anticorrosion , agingresistance, strong adaptability and long use life;

e)  wide size scope ,normial diameter of DN20-2400.

2. Application  scope:

a)  Excellent performance and wide application scope;

b)  Applicable for sewage system;

c)  Applicable for discharge system;

d)  Applicable for dyke discharge;

e)  Applicable for the drainage of airport and freeway 

f)  Applicable for  sewer discharge;

g)  Applicable for seage logoon discharge;

h)  Applicable for separation.

3. Installation position :

a) outlet of drainage pipe;

b) pipeline end of the flanged drainage pipe;

c) middle of drainage pipe in the city;

d) outlet end of the building;

e) outlet end of drainage pipe and system;

f)  end of mortar or cement pipe.

4. If other standard requirement or special flange need particularly customer made , please provide written drawing, standard, data, we can make customer- made for you .

5:certificates obtained:

 rubber check valves,rubber duckbill valve,rubber expansion check valve