1、 Introduction to Low Resistance Backflow Preventer

A single diaphragm low resistance backflow preventer is a hydraulic control combination device used in urban water supply systems to restrict the one-way flow of water transported in pipelines and prevent backflow. Its function is to prevent the backflow or siphon backflow of the medium in the pipeline under any working conditions, thereby avoiding backflow pollution.

2、 Characteristics of low resistance backflow preventer

1. Compact structure, saving installation space, small volume, low reflux, low noise, and working water loss of 1.3-2.5 meters at economic flow rate.

2. The accuracy and discharge pressure of the drainage valve can be adjusted to avoid interference from pipeline pressure fluctuations, ensuring reliable opening and closing and no abnormal discharge.

The proven reliability of the single diaphragm design and key components such as the diaphragm makes its quality superior to ordinary low resistance backflow preventers.

4. The two-stage check valve flow channel design has low flow resistance, fast opening and closing speed, which can effectively prevent damage to the valve and pipeline caused by sudden increase in back pressure, limit pressure water reflux or siphon reflux, and has a silent function, effectively extending the service life of the valve.

5. The product can be installed horizontally or vertically and supports online testing and maintenance.

3、 Design standard for low resistance backflow preventer products

Design and manufacturing requirements shall comply with GB/T11151 regulations

Valve inspection and pressure testing shall be conducted in accordance with GB/T13927

The length of the valve structure shall be in accordance with GB/T12221

The flange size shall be in accordance with GB/T17241.6

Apply epoxy resin powder on the surface of the valve before assembly and comply with GB/T17219 regulations

4、 Technical parameters of low resistance backflow preventer

5、 Structure and main components of low resistance backflow preventer

6、 Performance and characteristics of low resistance backflow preventer

7、 Installation method and precautions for low resistance backflow preventer

1. All pipelines should be thoroughly flushed before formal installation.

2. This valve should be installed horizontally as much as possible for easy debugging and maintenance.

3. The maintenance gate valve should be installed at both ends of the valve, the filter should be installed before the inlet, and the flexible joint should be installed at least at one end.

4. The outlet of the drainage valve shall not be directly connected to the drainage pipe, but shall be discharged to the ground drainage ditch. The distance between the lower end of the drainage valve and the ground shall not be less than 300mm.

5. In principle, it is not allowed to install this in mines. If installation is necessary, comply with local regulations; Require approved technicians to install it in an isolated and suitable space; Prevent floods caused by drainage.

When it is necessary to maintain the anti backflow valve without stopping the water supply, it is recommended to connect two of these valves in parallel (with a bypass pipeline) on the main pipeline.

7. After installation, when starting to use, close the outlet gate valve and slowly open the inlet gate valve to allow water to slowly fill the valve. Open the exhaust valve to clear the air in the valve chamber. After the valve chamber is filled with water, slowly open the outlet gate valve to allow water to flow throughout the entire pipeline.

Low resistance backflow preventer [Learning topic]: Overcome oneself and move forward, life will change greatly

Learning excerpts and insights

1. 'Liking' and 'investing' are the two sides of a coin, and there is a causal cycle between the two: because liking leads to investing in work; I will develop feelings of liking during the process of investing in work.

When my colleague Mr. Jiang shared his experience of growing from a completely computer novice to a human resources supervisor, I was thinking that what really hinders our progress is not our ability to overcome difficulties, but our attitude when facing difficulties. Is it the determination to persevere or the procrastination and avoidance of "giving up". It's really two parallel worlds.

2. At the beginning, even if reluctant, one should repeatedly comfort oneself in their heart by saying, 'I am doing an amazing job' and 'Working in this profession is my luck'. In this way, the perception of work will naturally change.

3. As long as you put in the effort, it will produce

Generate fruits, from which happiness and interest will arise. one

Once you have an interest, you will become motivated and generate new energy

Good result. In this virtuous cycle,

Unconsciously, you have fallen in love with your job.

4. 'Overcoming oneself' means suppressing selfish desires and not relaxing one's demands on oneself. Without achieving this, nothing can be accomplished, and one's abilities cannot be fully utilized.

5. The true ability of a person should include the self-restraint to suppress desires and fully devote oneself to work. No matter how great one's ability is, if they cannot overcome their desire for comfort, refuse to work hard, and "cannot exert their natural talents", in this sense, they lack the ability to exert their abilities.

Everyone's abilities are infinite, and by overcoming self-interest and unleashing one's own abilities, one can attain the spiritual freedom of others.

Thank you all for your companionship and fellow practitioners! Looking forward to further growth and progress with your help!