Lawa ma-valve asetshenziselwa ukulawula ukunyakaza kwe-actuator futhi akuvimbe kuzo zombili izinkomba. Ukuze kube nokwehla komthwalo ngaphansi kokulawula futhi ugweme ukuthwalwa kwesisindo somthwalo i-valve izovimbela noma iyiphi i-cavitation ye-actuator.

Lawa ma-valve alungile lapho ama-valve aphakathi nendawo avamile engasebenzi kahle njengoba engazweli engcindezini yasemuva.

Futhi zivumela ingcindezi yesistimu ukuthi ihambise ama-actuator amaningi ochungechungeni. Uhlobo "A" luhlukile ngenxa yezindawo zokuxhuma kanye nesilinganiso somshayeli.