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Troubleshooting
PROBLEM: Valve will not close
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" 600 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
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used in low flow drip irrigation systems.
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