Solenoid Valve Schematics - what does this mean?

[quarencia]

Does anyone know what this schematic means and can you explain it to me?

I'm adding a couple of proportional solenoid valves to the Bota and am having some trouble understanding this valve position schematic. I've never seen transition or crossover blocks showing metered flow paths during valve transition. I'm not sure exactly what this is telling me, but I suspect it's important to my purpose.

I'm trying to understand if I need to get configuration 008 or 009 in the below picture. I need a valve that has pressure to tank in neutral and pa-tb and pb-ta in the left or right positions. But I don't fully understand the meaning of the transition blocks (The second and fourth blocks in each configuration). I know these are showing how the valve behaves during transition from center position to either off-center position. I do not understand what the valve behavior will actually be based on the diagram. I have a guess at what they mean, but I'll keep my mouth shut and avoid confirming my stupidity and see if anyone here actually knows.



Note 1 for configurations 008 and 009 says "consider specific spool position"...so that's helpful. This is the link to the Parker document where this picture came from https://www.parker.com/Literature/I...atalogues/Industrial Valves UK/02/D1VW UK.pdf

Any good thoughts?

 

[WranglerX]

I'm with you, I always found the diagrams a bit confusing too...

Lot of information here, don't know if it confuses issue or brings clarity...

.Reading fluids circuit diagrams - hydraulic & pneumatic symbols

Dale

 

[oldnslo]

Those valve positions are showing what is happening during the time the valve is shifting from spring loaded center position to either end. The 008 spool shows pressure common to one work port & tank port during transition. The 009 shows all ports common during transition. These valves shift in approximately 50 milliseconds. For 3rd function on your tractor either will work fine.

For some systems this is critical information depending on loads, valve shift speed etc.