To avoid the balls of the valves from sticking to their seats, after you have cleaned out the sprayer (including the filters) you should make a final flush with a 10% solution of an airless sprayer corrosion inhibitor, such as Graco Pump Armour or Titan LS-10. If you are putting the sprayer away for longer than a month or so, then final flush with mineral spirits
Tap where where the intake ball to free it up
or take it apart and clean out the ball
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