36
Plumbing Guidelines (cont)
Valve Purpose and Adjustments
TANK SHUTOFF VALVE
The tank shut-off valve is for convenience only. It allows
you to work on the plumbing without draining the tank. It
should always be fully open during operation. See Plumbing
Overview Diagram on page 22.
AGITATION SHUTOFF VALVE
The agitation shut-off valve is mostly for convenience. It
allows you to work on the plumbing without draining the
tank. It should normally be fully open during operation.
See Plumbing Overview Diagram on page 22.
PRESSURE RELIEF VALVE
The pressure relief valve is used to avoid excessive pressure
when the booms are turned off. Start with the pressure relief
valve handle screwed most of the way out. Slowly bring
pump up to operating RPM (make sure pressure does not go
too high). Place the ON/OFF switch on the console in the ON
position, place the RUN/HOLD switch in RUN, and turn on
boom one. Hold the “+” button for about 30 seconds to fully
close the servo valve. Place the console in HOLD. Boom one
should shut off. Now slowly screw the pressure relief valve
handle in until the desired maximum pressure is obtained.
Lock handle in place with locking nut or collar.
NOTE: Spraying Systems 144H DirectoValve has a maximum
pressure rating of 100 PSI (7 bar).
RANGE ADJUST VALVE
The range adjust valve is required when the pump is much
larger than necessary. When the range valve is opened, some
of the liquid will be bypassed around the pump to avoid
“overloading” the rest of the system. The setting of the range
adjust valve is determined by the throttle valve. Start with
the range valve fully closed and perform the Pre-field System
Checkout on page 26. If the throttle valve needs to be more
than two thirds closed, open the Range valve slightly and
perform the Pre-field Checkout again.
THROTTLE VALVE
The throttle valve limits your high end to maximize servo
performance. Start with throttle valve fully open and perform
the Pre-field System Checkout on page 26. See Plumbing
Overview Diagram on page 22.
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 is too far closed, PSI may fluctuate greatly
in AUTO.
RELIEF VALVE
The relief solenoid is intended to insure enough bypass to
avoid over-pressuring the system when the boom valves are
turned off. See Illustration, page 22.
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