Ezinhlelweni zamahydraulic, kubalulekile ukuqonda umehluko phakathi kwevalve ye-overcenter kanye ne-ai-valve yokulinganisa. Nakuba lezi zibili zifana kweminye imisebenzi, isibonelo, zombili zingasetshenziswa ukuvimbela umthwalo ekuweni mahhala, kunomehluko othile ezimisweni zabo zokusebenza kanye nezimo zohlelo lokusebenza.

Umehluko phakathi kwe-valve emaphakathi nendawo kanye ne-balanced valve

I-valve ye-overcenter (ebuye ibizwe ngokuthi i-return check valve) iyi-valve yokusiza umshayeli enomsebenzi wokuhlola ukugeleza kwamahhala. Okubizwa ngokuthi isilinganiso somshayeli sibhekisela esilinganisweni phakathi kwendawo yengcindezi yomshayeli kanye nendawo echichimayo. Lesi silinganiso sibalulekile ebangeni lokucindezela lapho i-valve ingasuka khona ivaliwe ukuze ivuleke ngokugcwele, ikakhulukazi ngaphansi kwengcindezi yomthwalo ehlukahlukene. Isilinganiso esiphansi somshayeli sisho umehluko omkhulu wengcindezi yomshayeli odingekayo ukuze uvule ngokugcwele i-valve. Njengoba ingcindezi yomthwalo ikhula, umehluko odingekayo ekucindezelweni komshayeli wezilinganiso ezihlukahlukene zomshayeli uba mncane.

I-valve ye-counterbalance iyi-valve esetshenziselwa ukuvimbela isilinda somthwalo ukuba singawi, sinikeze ukusebenza okushelelayo. Uma kuqhathaniswa nama-valve okuhlola asebenza ngomshayeli, ama-valve aphikisayo awabangeli ukunyakaza okunyakazayo lapho umthwalo olawulwayo wehla. Amavalvu aphikisayo ngokuvamile asebenzisa i-cone noma izakhi zokulawula ukucindezela kwe-spool, anamavalvu aphikisana nekhoni asetshenziselwa ukuvimbela ukukhukhuleka kwesilinda nama-spool counterbalance valves asetshenziswa njengama-brake valves ekufakweni kwe-hydraulic motor.