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In a balanced spool valve, you have 2 distinct areas of pressure. High pressure and low. By balancing where those pressures are, the high pressure air is ONLY used to fire the ball, the low pressure is used to cycle it. In the Matrix and Quest, this translates to them using a LPR to adjust the LP, however Droids and Luxe are LPR-less balanced valve spools.
In an unbalanced spool, there is no low pressure air, it's all high pressure.
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