Le valve isetshenziselwa ukuvula i-inlet kumjikelezo we-hydraulic (Valve ngokuvamile ivaliwe).

Uma i-spool isicushwe ngomshini ukugeleza kukhululeka ukusuka ku-P kuye ku-A. Ingasetshenziselwa ikakhulukazi:
a) ukusetha ukulandelana kwama-actuator angu-2
b) njengesiphetho se-stroke valve, lapho ukugeleza kuxhunywe ethangini