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Check valve placed in the pipeline, that is to become one of the fluid components of the complete pipeline, flue check valve, also known as interior wall hood. It is also set to promote the deployment of equipment, environmental protection products. In the contemporary deployment of home equipment deployment, has been widely used. Flue check valve, also known as counter-flow valve, check valve, back pressure valve, check valve. This type of valve is based on the media pipeline itself, the activity of the birth of the initiative and opening and closing of the initiative, is an active valve. Check valve for piping system, its important role is to prevent media backflow, can be used in a variety of media on the pipeline. Check valve placed in the pipeline, that is to become one of the fluid components of the complete pipeline, flue check valve, also known as interior wall hood. It is also set to promote the deployment of equipment, environmental protection products. In the contemporary deployment of home equipment deployment, has been widely used. Flue check valve occurred, to the new higher residential, handled a major difficulty. It can prevent fumes backwards, but also play the role of adjoining pipes. The flue check valve is a quiet guard in your home that can effectively prevent toxic fumes and fumes from being crowded into the homes of other people in the mass flue, as well as controlling insects such as mosquitoes, moths and flies, as well as geckos Reptiles and other insects into the family, the most important thing is that it can guarantee the atmosphere inside your family health and quiet.