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”
2000 adaptor has a minimum flow requirement
of about 5 GPM
SOLUTION:
Sometimes, reducing the flow by turning the
flow control stem 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 2000. 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.
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Troubleshooting
PROBLEM: Valve will not close
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