Watts AMES Deringer 20 Installation, Operation And Maintenance Manual page 11

Open Shutoff Valves to Make Backflow Preventer Functional
1. Slowly rotate the number 1 shutoff valve operation handle
(A) counter clockwise to the open position. (Shutoff valve is
open when yellow/orange position indicator flags are parallel
to the mainline water flow)
2. As the valve fills with water air will be pushed through the
test cocks. Once a steady flow of water is released from the
test cocks close in order (2, 3 then 4. Test cock is closed
when wrench flats on stem are perpendicular to water flow
through test cock).
3. Slowly rotate the number 2 Shutoff valve operation Handle
(B) counter clockwise to the open position.
NOTICE
Yellow/orange position indicator flags must be parallel to
mainline water flow for backflow valve to be functional (C).
A
C
IOM-A-Deringer 20/30_2.5-4 2005
B
C
EDP#2916002
FLOW
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