Hydraulic Control Valve Cutaway HYDRAULICS FLUID POWER BASICS PART TWO

[@szymonkedziora5294]

Hi I was missing a movie like this. Great job, perfectly explained. I just hope my English allowed me to understand everything well 😅. Regards.

[@henrylevi3836]

Awesome explanation and tutorial. Is it safe to assume then, that if a spool is in the neutral position, and there are no port reliefs installed on that valve, if the cylinder was pressurized by external force like a thumb mechanism on the Auxiliary being pushed against by the bucket curl on an excavator, the fluid has no place to go and would either bend a cylinder, break a mount, burst a hose or even damage the valve?

[@hydraulics]

@henrylevi3836 yes. Bent cylinders and blown hoses... if the external force is great enough

[@VergorioVergara]

I need your help , i have a digger that it sounded like it was laboring when i moved the bucket with out load on it , so i thought about how to test what was happening and i took both hoses off the cylinder and i hooked together with a T and a pressure gauge and the pressure rises to over 2000Lb just moving oil in a loop , it’s a cluster of valves with 8 spools , do you think it’s leaking internally between spools or what do you think the problem is ? It’s feeding pressure to both hoses simultaneously

[@TheMetalButcher]

What happens if the rod end is overpressurised? There appears to be no pressure relief for it? Okay, I see now. That is a likely scenario for the bucket, but not for the boom, hence the lack on the rod end of the boom.

[@hydraulics]

Bingo. A lot of wheel loaders have no port reliefs in the loader lift circuit. They just build the components to take the abuse