Manualshelf

Instructions

ManualsBrandsCaleffi ManualsBackflow Preventers1/2" Sweat Dual Check Backflow Preventer w/ Atmospheric Vent
123456
Field testing procedure
1) Check operation of the discharge. When inlet water pressure drops to atmospheric, the
valve must open the vent port and discharge the contained amount of water in the valve body.
a. -close shutoff valves upstream and downstream.
b. -open the upstream test cock
The water contained in the body must be discharged, indicating that the diaphragm has
opened the vent port.
2) Check for tightness of the internal second check valve. When backpressure is applied to
the downstream side of the valve, the internal second check valve must close back drip tight
on its seat.
a. -close shutoff valves upstream and downstream.
b. -open the upstream test cock
c. -install a removable bypass hose connecting inlet test cock to downstream test cock and
open them for admitting pressure to the downstream side of the internal second check valve
Water must not drip from the vent port indicating that the second check valve is not leaking.
Service
The internal parts of the backflow preventer are replaceable. Spare parts are available upon
request.
Caleffi North America, Inc.
3883 West Milwaukee Road
Milwaukee, WI 53208
T: 414.238.2360 F: 414.238.2366