3
Types of Zone Valves
There are two basic types of zone valves commonly available. Anti-siphon valves
have a built-in backflow device to prevent possibly contaminated water from flowing
backward into the household supply. If approved by your local codes, these types of
valves provide inexpensive backflow protection. Anti-siphon valves must be installed
at least 6" above the highest sprinkler head on the line in order for the backflow de-
vice to work properly. Both automatic and manual versions are available.
The second type of valve is an "in-line" valve. It is installed below ground, preferably
in a valve box, for ease of maintenance. A separate backflow preventer is required for
backflow protection. In-line valves are automatic valves.
APAS-100-P
APAS-075-P
PAS-100
PAS-075
CP-075
CP-100
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