Backflow Preventers
ZECO Valve Group is established in 1991, as an experienced china valve manufacturer. We have 5 factories in China, which are located in Shanghai, Yancheng and Wenzhou, which mainly manufacture pressure reducing valve, pressure relief valve, balancing valve, PICV, water valveand industrial valves.
Festures of Backflow Preventers
lThe double check valve is designed as a whole, with small structure；
lBody is streamlined with little resistance loss；
lCombination of a double check valve and safety drain valve can completely prevent backflow pollution under any working condition；
lAll moving parts are made of non-rust and wear-resistant materials with long service life.
As one of the backflow preventer suppliers, ZECOoffers many high quality produxts, such as 2.5 inch backflow preventer, 4 double check backflow preventer, 6 rpz backflow preventerand so on. Backflow preventers for two check valve series, when one of the seal damage, the other also ACTS as a seal to prevent backflow. However, when the sealing of two check valves is broken at the same time, the check function is lost. Backflow preventers on the common type of foundation in the middle of the drain, so even if two check valve sealing at the same time damage, it can also play a role in preventing backflow pollution.
This double backflow valvemust be installed horizontally, the environment of the installation site should be clean, there should be sufficient maintenance space, the main degree of safety drain or (air barrier) outlet is more than 300mm above the ground, and 3 inch backflow valveshould not be flooded by water or debris, and the installation area should be equipped with drainage facilities. If you don’t know where to buy backflow preventer, please consult ZECO Valve Group.
Backflow Preventers Material and Standard
Size Range: 2"~12"Pressure Rating: 10bar ~ 25barFace to Face Dimensions: AMSE B16.10, EN558-1Flange End Dimension: AMSE B16.1/16.42, AS4087, EN1092-2Coating: Fusion Bonded Epoxy CoatingInspection and Test: ISO 5208 / EN 12226-2
|
Part |
Material |
Standard |
|
Body |
Ductile Iron |
EN 1563/DIN 1693 |
|
Bonnet |
Ductile Iron |
EN 1563/DIN 1693 |
|
Seat |
CuZn39Pb1 / C37000 |
EN12167/ASTM B135 |
|
Stem |
Stainless Steel 431 |
EN10088-1/ASTM A959 |
|
Spring |
Stainless Steel 431 |
EN10088-1/ASTM A959 |
|
Seal |
EPDM / NBR |
ISO 4633 |
|
For the materials options not listed, consult factory. ZECO manufactures valves in more than 50 different alloys. |
||
在线联系供应商
Other supplier products
 |
Pressure Independent Control Valve | PICV can manually adjust the set flow rate in the pipeline, and also can automatically maintain the pressure difference before and after the valve ... |
 |
Forged Ball Valve | Description of Forged Ball Valve: ZECO forged ball valve is divided into forged two-piece ball valves and forged three-piece ball valves, as well a... |
 |
Wafer Check Valve | What is a Wafer Check Valve? Wafer check valves are in-line piping valves used to control fluid flow direction and reduce or fully prevent possi... |
 |
4 Inch Ball Valve | Description of 4 Inch Ball Valve: ZECO4 inch flanged ball valveis also the most common batch products, which are mainly floating ball valves. Occa... |
 |
Strainer & Dirt Separator | Strainers, dirt separatorsand backflow preventers are designed to prevent impurities from entering the specified pipe section. Comparing these thre... |
Same products
 |
HO-70A hand crank slicer and shredder | 卖方: YONGKANG HAIOU ELECTRIC CO., LTD. | HO-70A hand crank slicer and shredder for slicing and shredding potatoes, radishes and other kind... |
 |
Blue Abs Shell With Vertical Noodle Press | 卖方: YONGKANG HAIOU ELECTRIC CO., LTD. | 1. Classic vertical noodle press 2. Blue ABS shell with foot box 3. Can be used to make noodles... |
 |
Wood Pellets | 卖方: Jiangsu Kingwood Industrial Co., Ltd. | Wood pellets are a form of biomass fuel derived from compacted sawdust and other wo... |
 |
Slab and pellet beeswax for cosmetic | 卖方: Syntop chemical Co.,Ltd. | Nowadays, beeswax has begun to be used as green food additives, coatings, packaging, additives in... |
 |
Mini Shovel Rake Spade Garden Succulent Transplant Drilling Tool | 卖方: https://www.chinaaerator.net/ | The Mini Shovel Rake Spade Garden Succulent Transplant Drilling Tool() is a versatile gardening t... |
