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Operation
26 333309E
Using the Proportioning Pump
System
When the system is primed and operating, check the
fluid outlet pressure gauges. Check the gauges fre-
quently while using the system and note the pressures.
These notes will be helpful in analyzing problems that
may occur, as a change in the displacement pump per-
formance will be indicated by a change in the pressure
gauge readings.
NOTE: A pressure drop does occur during pump stroke
changeover.
1. Set the air pressure to the proportioning pump to
obtain the fluid pressure you require.
2. Set the air pressure to the feed pumps at a pressure
that will not give more than 25% of sprayer outlet
pressure at their fluid outlets.
NOTE: Pressures greater than 25% may prevent the
proportioning pump inlet ball checks from seating prop-
erly.
3. Point the spray gun into a grounded metal waste
container and trigger the spray gun to purge air out
of the dispensing lines. After all air has been purged
from the lines, release the trigger and engage the
gun trigger lock.
NOTE: The pumps will start and stop as the gun is trig-
gered and released.
To reduce the risk of serious injury, including fluid
injection:
• Do not exceed the maximum air and fluid working
pressure of the lowest rated component in your
system.
• Always close the air supply valve to the pump
before opening the fluid drain valves to relieve
system pressure. This will reduce the risk of
excessive pressure buildup in the opposite
component hose and fittings.