[116] 4/3-way valve with closed mid-position (1)
From the logic point of
view, 4/3-way valves are 4/2- way valves with an additional
mid-position. There are various versions of this mid-position (in
the mid-position in the example shown, all ports are closed in
the mid- position, see next
illustration). In the switching
position shown, there is flow from P to B and from A to
T.