hazard

Question 1

AVB

Answer 1

high hazard or low hazard
only back siphonage
Can not be subjected to continuous pressure

Question 2

SVB

Answer 2

Back siphonage only
high or low hazard
can have continuous water pressure
No back pressure

Question 3

Double Check Valve

Answer 3

Max allowed pressure loss is 10psi
Can be installed vertically
Only Low Hazard
Provides back pressure and back siphonage protection
Containment and isolation

Question 4

RPZ

Answer 4

Check 1 5psi
Check 2 1psi
Relief Valve 2psi
High or Low hazard
Back pressure or siphonage

Question 5

PVB

Answer 5

High or Low Hazard
Back siphonage ONLY
Can have continous pressure
Max pressure loss 10 psi