39 hydraulic spool valve diagram
hydraulic test pom plugged port rotary union detent return above'below fluid level check valve shut-off valve spool controls energy transformations ... directional valve (spool form 2 (cc. 5evp3d2...) pilot operated solenoid fluid treatment breather with filter filter (eg. 2fa..,) filter with indicator valve-directional control valve with 5 ports and 2 finite postions Directional control valve (5 ports / 3 positions) Normally a pneumatic valve-directional control valve with 5 ports and 3 finite postions Proportional directional control valve Electro-hydraulic servo valve-The spool positions on these valves is variable allowing for variable flow Proportionals W3-spool: hydraulic regeneration extends cylinder quickly. Rod side is blocked by B port. High pressure on rod end pushes flow over external check valve - Fast traverse. but rod pressure is high! - Tonnage reduced! Extending force = rod area x pressure bore Regen Spools with external bypass W3-spool W9 -spool Hydrau...