Sephahla sena se sebelisetsoa ho bula seketsoana ho potoloho ea hydraulic (Valve hangata e koetsoe).
Hang ha spool e kentsoe tšebetsong, phallo e lokolohile ho tloha ho P ho ea ho A. E ka sebelisoa haholo bakeng sa:
a) ho beha tatellano ea li-actuator tse 2
b) e le pheletso ea valve ea stroke, moo phallo e amanang le tanka.