[110] 4/3-way valve with pump bypass (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, the supply port P is
directly connected to the tank T, see next
illustration). In the switching position
shown, there is flow from P to B and from A to T.
4/3-way valves are easy to construct as slide valves and of complex design as poppet valves.