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Ames M300N

Stainless Steel Double Check Detector Assemblies with Tri-Link Check Valves for High Flow Fire Systems

Series M300Na Double Check Valve Assemblies are specifically designed for high flow fire systems to prevent the backflow of pollutants that are objectionable but not toxic, from entering into the potable water supply. Its compact housing consists of two independently operating bi-link check valves, two shutoff valves, and four test cocks. It features a stainless steel housing and sleeve and is 70% lighter than traditional designs. Series M300Na features the certified lowest pressure loss and is designed for non-health hazard applications and may be installed under continuous pressure service to protect against both backpressure and backsiphonage. This Series is used primarily on fire sprinkler lines when it is necessary to monitor unauthorized use of water. Maximum Working Pressure: 175psi (12.06 bar).


2 1/2 to 4 in. (65 to 100mm)

The Double Check Detector Assemblies shall consist of two independent Bi-Link Check modules within a single housing, sleeve access port, four test cocks and two drip tight shutoff valves. Bi-Link Checks shall be removable and serviceable, without the use of special tools. The housing shall be constructed of 304 (Schedule 40) stainless steel pipe with groove end connections. Bi-Link Checks shall have reversible elastomer discs and in operation shall produce drip tight closure against the reverse flow of liquid caused by backpressure or backsiphonage. The bypass assembly consists of a meter, which registers in either gallon or cubic measurements, a double check valve assembly and required test cocks. Assembly shall be a Maxim M300Na as manufactured by the Ames Company.