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Flanged type backflow preventer

Flanged type backflow preventer

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Description

Size:DN 50~DN 200

Pressure:PN10/PN16


Description:

TWS Flanged type backflow preventer  is a kind of water control combinatin device developed by our comapny, mainly used for water supply from urban unit to the general sewage unit strictly limit the pipeline pressure so that the water flow can only be one way. Its function is to prevent the backflow of the pipeline medium or any condition siphon flow back, inorder to avoid backflow pollution.

Application:

It can be used in harmful pollution and light pollution, for toxic pollution.It is also used if it cann't prevent backflow by air isolation.

It can be used in soruce of branch pipe in harmful pollution and continuous pressure flow and not used in preventing backflow of toxic pollution.

Main maintenance parts:

1. Continuous drain of outlet not allowed, if necessary, install leakage alarm device of outlet;

2. Drain outlet shouldn't be flooded;

3. Drainer normal work when backflow;

4. Clean the screen of strainer once a year at least;

5. Inspect and water test once a year for preventer used in pipe of seldom flow;

6. Inspect the preventer once a month at least that installed under well, inspect immediately after rainfall;

7. Inspect the leakage alarm device once half year at least.

8. After water network maintenance in near city, inspect the preventer immediately that connected with pipe of maintenance.


Dimensions:

DN(mm) 50 65 80 100 125 150 200
Inch 2 2.5 3 4 5 6 8
ΦA 165 185 200 220 250 285 340
ΦB 125 145 160 180 210 240 295
ΦC 99 118 132 156 184 211 266
H 364 365 412 436 435 498 585
H1 196 206 215 226 239 252 287
The 320 360 369 406 430 480 572
b 19 19 19 19 19 19 20
n*Φd 4 * Φ19 4 * Φ19 8 * Φ19 8 * Φ19 8 * Φ19 8 * Φ23   8 * Φ23 / 12 * Φ23

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