1/2 Inch M3 Backflow Preventer Brass Dual Check Valve

It is particularly recommended for boiler water supply pipelines to prevent backflow when the water supply pressure is lower than the system pressure. It is suitable for both hot and cold water and can withstand continuous pressure. Its features include a main check valve, which uses a rubber disc in contact with the matching rubber components for a secure closure, and a secondary check valve with a rubber disc in contact with the metal for sealing. If the downstream check valve gets clogged, the leakage will be discharged into the atmosphere through the exhaust port, thereby protecting the drinking water system. This series has a brass casing, with internal components made of stainless steel, equipped with an integrated filter and durable rubber discs. The interface is a female hinge-type inlet and outlet connection. The size is 9D-M3 1/2 inch. The drainage uses a 1/2 inch threaded connection.