Stack Valves vs Multi-Spool Directional Control Valves

[Chewwy]

I’m still a little confused by some hydraulic system terminology.

What is the difference between stack valves and directional control valves?

From what I can figure out, the number of functions which can be controlled by stack valves can be expanded or reduced by adding or removing valves. Functions controlled by directional control valves are limited to the number of spools.

Am I correct, partially correct, or totally missing the boat?

 

[RNeumann]

Stack are individual valves that are designed to be stacked together- you need two you buy two, you need 4 buy 4. You need 3 but maybe 4 later you can do that.

The nice thing about stacking valves is each one can be a different style- return to center etc etc. And of course you can switch locations too.

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https://www.bucherhydraulics.com/da...Monoblock/HDM15/HDM,HDS15_200-P-991228-en.pdf