Backflow preventer Puhui brand

DF41-10Backflow preventerThe manufacturer of backflow preventer, Puhui Telephone. Backflow preventer is a hydraulic control combination device that strictly limits the unidirectional flow of water in pipelines. All models of backflow preventers are available, including backflow preventers. DF41-10 backflow preventer is a hydraulic control combination device that strictly limits the unidirectional flow of water in pipelines. Its function is to prevent the backflow of medium in pipelines under any working conditions, in order to avoid backflow pollution.

Main parameters of DF41-10 backflow preventer

Nominal pressure: 1.0MPa-1.6MPa-2.5MPa;

Specification caliber: 50 to 600mm;

Medium temperature: 0 to 80 degrees;

Applicable media: water, reclaimed water, sewage.

Connection form: flange;

Shell material: cast iron, brass;

Flange standard: GB/T17241.6 GB/T9113；

Test standard: GB/T13927，Ap1598。

Size and weight of backflow preventer:

Model of backflow preventer

What are the models and specifications of backflow preventers? Specification caliber: Supply caliber: DN40-DN400； Specifically, there are DN40 DN50mm、DN65mm、DN80mm、DN100mm、DN125mm、DN150mm、DN200mm、DN250mm、DN300mm、DN350mm、DN400mm。

Pressure rating models: 1.0MPa, 1.6MPa, 2.5MPa.

Working principle of backflow preventer

Working principle of backflow preventerWhen the medium flows through the inlet check valve, the pressure is reduced due to mechanical resistance and the loss of the overflow head, making the pressure higher than the pressure in the drain valve chamber. The pressure in the upper part of the drain valve diaphragm is the pressure, and the pressure in the upper part of the diaphragm is greater than the resistance in the drain valve chamber and spring. The drain valve remains closed and the medium flows normally. When the pressure difference between the pressure and the pressure in the drain valve chamber is less than 0.02 Mpa, the medium is in a critical state of backflow. At this time, the pressure in the upper part of the drain valve diaphragm is less than the pressure in the drain valve chamber and spring, and the drain valve automatically opens to discharge the backflow medium out of the pipe. At the same time, a large amount of air enters the valve chamber, forming an air partition, and the medium flows backwards. When the pressure.

When the water pressure in the pipe network after the valve rises and exceeds the water pressure at the upstream end of the valve, if the one-way check valve is sealed properly and the water will not flow back, the drain valve will close and not release water. When the one-way check valve fails to seal and leaks, the drain valve will open to drain and release pressure.

Installation position of DF41-10 backflow preventer

1. The municipal pipeline network connects the user's water intake pipe to the pipeline between the water meter and the valve.
2. On the inlet pipe or fire outlet pipe of the fire pump adapter.
3. There are chemicals injected into the water supply pipes in the water supply system.
4. On the cold water inlet pipe of the heater, and on the water supply pipeline that may cause backflow.

DF41-10 Backflow Preventer Installation Instructions

1. Before installation, clean all pipelines.
2. The backflow preventer should be installed horizontally in the direction of the valve body arrow, and the installation position should be convenient for height and maintenance.
3. Both ends of the backflow preventer should be equipped with maintenance gate valves, a filter should be installed in front, and one end should be equipped with a flexible joint.
4. The distance between the drainage outlet of the drain valve and the ground should not be less than 300mm, and a drainage ditch should be left below the drain valve.
5. After installation, when starting up for the first time, the outlet gate valve should be closed and slowly opened to allow the medium to slowly fill and prevent backflow
Open each test ball valve to remove valve air, wait for the valve chamber to be filled with water, slowly open the gate valve to allow water to fill the pipeline.
6. When the medium pressure changes, a small amount of leakage from the drain valve is a normal phenomenon.

Picture of backflow preventer

Image description of backflow preventer: The left image shows the blank of the backflow preventer. Each blank needs to be strictly polished and polished. The image on the right shows the semi-finished product of the backflow preventer. A semi-finished product that has been sprayed and processed needs to undergo another pressure test before installing the copper parts and packaging them for shipment.

Price of backflow preventer

The price of backflow preventers varies every month, and the main factor determining the price of backflow preventers is the specifications and caliber, followed by the pressure rating that affects the price of backflow preventers. Our product is suitable for pipelines with clear water as the medium. The shell of the backflow preventer is made of cast iron material. If full copper manufacturing is required, it can be customized for production. We have advantages in price, quality, and after-sales service. 【 Puhui 】 DF41-10 backflow preventer, free installation plan provided. Limited edition promotion: 0317-8294124.

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