CAUSE #5: Insufficient flow
Irrigation valves and adaptors have a minimum
flow requirement in order to close. The larger
the valve size, the greater the minimum flow
requirement . A ¾” 800 adaptor has a minimum
flow requirement of about 5 GPM.
SOLUTION:
Sometimes, reducing the flow by turning
the flow control handle clockwise as much as
possible without adversely affecting coverage
will enable the valve to close. If it works, do not
readjust the flow control. If it does not work,
then increase flow by adding sprinkler heads or
emitters to the system. If that is not possible,
then it is recommended that a model 850-DI be
used in place of the model 800. This will
necessitate replacing the anti-siphon valve body
as well. The model 850-DI, shown is photo at
right, has no minimum flow requirement. It was
designed to be used in low flow drip irrigation
systems.
12
Troubleshooting
PROBLEM: Valve will not close
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