Ductile Iron Non-return backflow preventer

 Products Overview

Slight resistance Non-return Backflow Preventer(Flanged type) TWS-DFQ4TX-10/16Q-D is a kind of water control combination device developed by our company, 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, in order to avoid backflow pollution.

Structure drawings of Ductile Iron Non-return backflow preventer

Main parts and the meterial of Ductile Iron Non-return backflow preventer

Table of Main Dimensions(mm) of Ductile Iron Non-return backflow preventer

Structure features:

1. It is of compact and short structure; slight resistance; water saving; online detection and maintenance etc. Under normal work in economic flow rate, water damage of product design is 1.8-2.5m.

2. Two levels check valve's wide valve cavity flow design is of small flow resistance. rapidly on-off seal of check valve, which can efficiently prevent damages to the valve and pipe by sudden high back pressure, withi mute function, effectively extending the service life of the valve.

3. Accurate design of drain valve, drain pressure can adjust the pressure fluctuation valve of the cut offf water supply system, to avoid the interference of the system pressure fluctuation. On-off safely and reliably, no abnormal water leakage.

4. Large diaphragm control cavity design makes the reliability of the key parts is better than that of the back flow preventer, sately and reliably on-off for drain valve.

5. The combined structure of large diamer drain opening and diversion channel. complementary intake and drainage in the valve cavity have no drainage problems. Completely limit the possibility of back down stream and siphon flow reversals accur.

6. humanized design can be online test and maintenance.

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.