This type of spool is used on loaders or snow plows. This allows the hydraulic cylinder to float, all ports are connected to the reservoir when the valve is in the float position.
answered 3 years, 11 months ago
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When the operating handle is held in the extreme "down" position, oil is permitted to flow in either direction. This allows any cylinder attached to those ports to be moved in and out by external forces. On my son's bulldozer, for instance, it allows the dozer blade to follow the terrain when scraping a pile of stones into a low spot.
answered 1 year, 11 months ago
- Rural Pennsylvania
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