3
Flow rate graph
10
2
5
20
50
∆
p
(psi)
G
(l/min)
(
gpm
)
(psi) (bar)
1
0.5
15
0.3
Cv = 0.7
VENT
Page 1: ...hreaded connection with union size 1 2 sweat connection with union size 1 2 press connection with union Backflow preventer with intermediate atmospheric vent 38517 06 Installation commissioning and se...
Page 2: ...Over time this could cause breakages with consequent water losses which in turn could cause harm to property and or people ATTENTION Lorsque vous effectuez les raccordements d eau assurez vous que la...
Page 3: ...3 Flow rate graph 10 2 5 10 5 20 50 p psi G l min gpm 20 10 5 psi bar 20 1 0 5 10 2 5 15 1 0 5 0 3 Cv 0 7 VENT...
Page 4: ...the flow direction indicated by the arrow on the valve body The Caleffi 573 series backflow preventer must be installed with one isolating valve and a strainer upstream and one isolating valve downstr...
Page 5: ...ACKFLOW PREVE Series 573 Sizes 1 2 3 4 S N VENT Heating system application MAINS SUPPLY Upstream test cock Upstream shut off valve Downstream shut off valve Downstream test cock Inlet test cock Backfl...
Page 6: ...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 remo...
