Which valve can create a 2/2 way function by plugging ports?

The four-way, two-position (4/2 way) valve is designed in such a way that it can be made to perform a two-position function by plugging certain ports. In its standard configuration, this type of valve is capable of controlling the flow of fluid through four different ports and can direct that flow to two distinct outputs. By plugging one or more of the ports, the functionality can be reduced to a simpler two-port operation.

This versatility is key in various hydraulic and pneumatic applications where switching between two states is necessary. For example, by using a 4/2 way valve and configuring it appropriately, one can achieve a functionality that either allows flow in one direction or the other but not both simultaneously, effectively replicating a two-way valve's action.

The other options listed do not provide the same level of flexibility for achieving a two-port function through port plugging. Each of them has their own functions and limitations that are distinct from the 4/2 way valve's capabilities.