Rubber duckbill valve for sewage made in our company have been receiving reputation not only at home but overseas.This duckbill valve is our special product,and it is used for draining sewage.
HUANZHONG Duckbilled Check Valve are precision-molded, one-piece elastomeric valves that provide reliable backflow prevention at low-pressure differentials. Our duckbill check valves allow free flow with positive differential pressure. With negative differential pressure, backflow is checked. Pressure drop across the valve is a feature unique to Duckbill check valves. They can be designed to operate in a few millimeters (inches) of water to several hundred kPa (psi), depending on valve size, geometry, and compound characteristics.
HUANZHONG Duckbill valve with flange connection are also designed to start functioning at specific opening and closing pressure ranges, depending on customers' specifications.We can also supply various flanges of ANSI, DIN, BS, JIS ect. for your choosing.
Slip on Rubber Duckbill Check Valve:
1.Standard construction
2.Very quiet operation with no water hammer
3.Its unique design prevents backflow
4.Negligible maintenance and energy costs
5.Will not warp or freeze
6.Quick interchange with any flap type check valve
7.Available in sizes 1" – 96"
8.Available with special I.D to suit concrete pipe
| Matching Pipeline Diameter
|
Valve Step（A） | Pipeline Touching（B＞） |
| 1/2″~3/4″ |
15 |
15 |
| 1″~1-1/4″ |
20 |
20 |
| 1-1/2~2-1/2 | 25 |
25 |
| 3″ | 40 |
40 |
| 4″ |
50 |
50 |
| 6″ |
50 |
50 |
| 8″ | 50 |
50 |
| 10″ | 50 |
50 |
| 12″~14″ | 100 |
100 |
| 16″~20″ |
150 |
150 |
| 24″~36″ |
200 |
200 |
| 42″ | 250 |
250 |
| 48″~60″ | 300 |
300 |
| 72″ | 400 |
400 |
| Note:DN800~DN1800（32″~72″） double hoops | ||
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