How does a three-way four-position valve work?
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The spool of a three-way four-position valve can be in three positions within the valve body. When the spool is in the middle position, the oil chambers P, A, B, and O are all different. When the spool is in the left position, the oil inlet chamber P is connected to chamber B, while chamber A is connected to the oil return chamber O. When the spool is in the right position, the oil inlet chamber P is connected to chamber A, while chamber B is connected to the oil return chamber 0 through the annular groove.
Sweat, there’s no need to ask this question, right?:L