Notice to Installer — This device must not be installed indoors.
The Toro PVB (Pressure Vacuum Breaker) is designed to prevent backflow of contaminated water into the potable
water system due to back-siphoning conditions only. This device should not be installed indoors or where
backflow due to back pressure may occur. Installation of this device should conform to local building and plumb-
ing codes as they apply. Refer to the “Installation Requirements” on page 2 prior to installing this device.
Introduction
The Toro Model PVB is comprised of a positive-seating check valve, a spring-loaded vent float assembly
(located down stream of the check valve), quarter-turn ball valves on the inlet and outlet ports and test cocks
located upstream and downstream of the check valve. The vent float assembly is spring loaded to the open
position and will allow air to enter the system when line pressure drops to 1 PSI (.07 kg/cm
2
) or below, thus
preventing back-siphoning. This feature permits installation of irrigation control valves downstream of the
PVB. Recommended operating pressure range is 25–150 PSI (1.75–10.6 kg/cm
2
).
Installation Instructions
3/4" PVB, Models 220-03 and 220-13 (80-0550 pre-1993)
1" PVB, Models 220-04, 220-14 and 220-54 (80-0560 pre-1993)
1" PVB, Model 53300
CLOSE
OPEN
C.L.
CLOSE
OPEN
C.L.
PVB
Sprinkler
Figure 1 – For Outdoor Installation Only
12" (30.5cm)
minimum
Control
Valve
Critical Level
Line
NOTE TO INSTALLER:
PVB devices MUST BE installed outdoors.
All PVB units must be installed according
to local codes and are NOT APPROVED for
indoor installation (i.e., basement or garage).
