41
Plumbing Guidelines (cont.)
T
hrottle Valve
The throttle valve limits your high end to maximize servo
performance. Start with throttle valve fully open and perform
the Prefield System Checkout on page 33-34.
Example: With the throttle fully open and servo fully closed,
you may be able to get 50 GPA at 5 MPH when you
only want 25 GPA. If you were to simply open the
servo you may be able to get down to 25 GPA, but
if your speed should drop to 3 MPH, the servo can’t
open any farther and won’t be able to maintain 25
GPA. Therefore, if you leave the servo closed and
close the throttle until your high end has dropped
from 50 GPA to about 30 GPA, the servo has a
greater operating range.
The throttle valve pictured in the system diagram is
a needle valve (Spraying Systems Type 12690 or
12795). A ball valve may be used but is more
difficult to adjust and keep adjusted. Do not install
a pressure regulator or relief as a throttle valve.
If the throttle valve is closed too much, PSI may
fluctuate greatly in AUTO.
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