Normal Operation
M200/M300 - In normal flowing operation, the independent check valves
remain closed until there is a water demand. Each check
will then open and maintain an approximate 1 PSI
differential in the direction of flow. In a nonflow or backflow
condition, both checks will close until the resumption
of normal flow.
M400/M500 - In normal flowing operation the independent check valves
will be open and the pressure differential relief valve located
between the two check valves, the area called the zone,
will automatically open and close to maintain the zone
pressure at least 2 PSI lower than the inlet pressure. If
demand for flow stops, the differential pressure relief valve
will automatically open and discharge water to maintain the zone at a pressure of 2 PSI lower than the inlet pressure.
After the pressure differential is reestablished, the
differential pressure relief valve will automatically close.
Specifications - M200/M300
The Backflow Assembly shall consist of two independent
Link-check modules within a single housing with sleeve
access, required test cocks and drip tight shut-off valves.
Link-checks may be removed and reinstalled in housing, without
any special tools. The housing shall be constructed of 300
series stainless steel with groove end connections. Link-checks
shall have reversible elastomer disks and in operation shall
produce drip tight closure against the reverse flow of liquid
caused by backpressure or backsiphonage. Device shall be an Ames Fire & Waterworks MAXIM 200 or
300 series.
Specifications - M400/M500
The Reduced Pressure Backflow Assembly shall consist of
two independent Link check modules, a differential pressure
relief valve located between and below the two modules,
drip tight inlet and outlet shutoff valves, and
required test cocks. Both check modules and the relief
valve shall be contained within a sleeve accessible single
housing constructed from 300 series stainless steel with
groove end connections. Link checks shall have reversible
elastomer disks and in operation shall produce drip tight
closure against the reverse flow of liquid caused by
backpressure or backsiphonage. Assembly shall be an Ames Fire & Waterworks MAXIM 400 or 500 series.
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