Backflow Preventers
The problem of contaminated water due to backflow is emerging, and the health hazards caused by contaminated water are also alarming to engineers and backflow preventer manufacturers. The problem of backflow water may occur in every place where water is used. We can learn about the harm caused by backflow water from the following two specific cases: A serious backflow problem occurred in Allegheny County, Pittsburgh, Pennsylvania.
A pest control company contaminated the water supply when it used the insecticide to kill termites. The company USES water from garden pipes to mix chlordane and heptachlor in tanker trucks. The end of the hose is immersed in the chemicals, while water pipes in the area are draining.
When the plumber inserted the pipe into thegate valve , the water began to flow out because the discharge point was downstream of the tank car and there was no water backflow preventer installed, which caused the siphon phenomenon, causing the chemicals to be sucked out of the tank car and into the water supply system; The drinking water of a primary school in bowling green, Kentucky, was contaminated with ethylene glycol, a chemical used in an HVAC system, due to the lack of a backflow preventer valve.
When the contractor pumps the drinking water into the geothermal heat pipe, a small amount of ethylene glycol flows back into the drinking water under pressure. The university then issued a notice to ensure the safety of drinking water in the future, staff in the HVAC system pipes installed double check backflow preventer.
Zhengfengis one of the most professional water gate valve manufacturersin China. And we sincerely invite and welcome people from all around the world to invest and create more values together.
在线联系供应商
Other supplier products
 |
Combined Butterfly-Check Valve | Basic informationThis valve acts as a closed circuit valve and a check valve to protect the system by avoiding and reducing the backflow of the int... |
 |
3 Inch Butterfly Valve | Description of 3 Inch Butterfly Valve:ZECO 3 inch butterfly valve/butterfly valve 3 inchis a small diameter butterfly valve, usually manually opera... |
 |
Ductile Iron Gate Valve | Features of ductile iron sluice valve Visual valve switch easily; Quick opening and closing, light torque; Brass nut wear-resistant, long switch... |
|
|
Adjustable Dynamic Flow Balancing Valve | Basic information This valve can manually adjust the set flow rate in the pipeline, and also can automatically maintain the pressure difference bef... |
 |
6 Inch Gate Valve | Description of 6 Inch Gate Valve: All casting and forged parts of ZECO 6 inch flanged gate valve, especially the body and cover two of the main pr... |
Same products
 |
China Gate valve | 卖方: Yuanda Valve Group Co.,Ltd. | China Gate valve China Gate valve A is a type of valve that uses a gate or wedge-shaped dis... |
 |
Gate Valve Vs. Ball Valve | 卖方: Yuanda Valve Group Co.,Ltd. | Gate Valve Vs. Ball Valve Gate valves and ball valves are both types of valves that are used... |
 |
Non Return Valve Suppliers China | 卖方: Yuanda Valve Group Co.,Ltd. | Non Return Valve Suppliers China refers to the opening and closing member for the circular v... |
 |
Common Types Of Check Valves | 卖方: Yuanda Valve Group Co.,Ltd. | Common Types Of Check Valves A is a valve whose switching parts are disc-shaped and rely on ... |
 |
Brass ball valve | 卖方: Yuanda Valve Group Co.,Ltd. | Brass ball valve Brass ball valve Applications: Water Supply: Commonly used in residentia... |
