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
 |
Backflow Preventers | The concentricbutterfly valveis characterized by the stem center, disc center and body center in the same position. Such structures are simple to m... |
 |
Pneumatic Ball Valve | As one of the leadingchina ball valve suppliers, ZECO Valve Group developed our own laboratory for research &development for international stan... |
 |
Pressure Relief(Sustaining) Valve | Basic informationThis sustaining valveis opened to prevent the pipeline and equipment from being damaged due to overpressure when the pressure in t... |
 |
Flange Globe Valve | Category: Globe Valve Description Globe stop valveprovide superior performance and reliability in a wide range of applications. What is a Fl... |
 |
Control Valve | ZhengFengbalanced trim control valves are widely used in water supply and drainage control systems in the global building market. As one of the ... |
Same products
 |
Class 300 Valve | 卖方: GangYe Group Co.,Ltd. | Class 300 valves have a pressure rating of 300 pounds per square inch (psi) or 20.7 bar, allowing... |
 |
Class 3000 Industrial Valve | 卖方: GangYe Group Co.,Ltd. | Wafer Body, Full Port Design, Flanged End Class 3000 Ball Valve. A ball valve class 3000pressure-... |
 |
Class 2500 Industrial Valve | 卖方: GangYe Group Co.,Ltd. | Class 2500 valves can be used for both on-off and throttling applications. The specific valve typ... |
 |
Class 150 Valve | 卖方: GangYe Group Co.,Ltd. | globe valve class 150is a pressure rating designation defined by standards organizations, such as... |
 |
Class 1500 Industrial Valve | 卖方: GangYe Group Co.,Ltd. | A class 1500 valve made of 316 stainless steel, for instance, can sustain 248 bar of pressure at ... |
