Watts 774 - Manual (Page 2)

2
Installation Note:
The flange gasket bolts for the gate valves should
be retightened during installation as the bolts may
have loosened due to storage and shipping.
774 Series for Retrofit Installations
Watts 774
12” min.
Refer to
Local Codes
Vault Installation Vertical Flow Up
12” min.
Refer to
Local Codes
Watts 774
#2 Test Cock
#3 Test Cock
#4 Test Cock
Outlet
Shutoff
Valve
Second Check
First
Check
#1 Test Cock
Inlet
Shutoff
Valve
Installation Instructions
Watts Series 774 Double Check Valve
Check with local authorities for installation requirements.
Install valve in the line with arrow on valve body pointing in the
direction of flow. Pipe lines should be thoroughly flushed to re-
move foreign material before installing the unit. A strainer should be
installed as shown, ahead of the backflow preventer to prevent discs
from unnecessary fouling.
CAUTION: Do not install a strainer when backflow preventer is
used on seldom-used water lines which are called upon during
emergencies, such as fire sprinkler lines, etc.
It is important that Series 774 be tested periodically in compliance
with local codes, but at least once a year or more often, depend-
ing upon system conditions.