[106] 4/2-way valve, three pistons (1)
This 4/2-way valve has two
working ports A and B, a supply port P and a tank port T. The
supply port is always connected to one of the working ports,
while the second working port is routed to the tank. In the
neutral position, there is flow from P to B and from A to
T.
4/2-way valves with three pistons require a leakage-oil port, since hydraulic fluid would otherwise be trapped within the valve.