Mālamaʻia ka hana cylinder maʻamau e kahi valve pneumatic, i ka wā e wehe ai ka mea pneumatic e kāohi i kekahi o ka paena o ka paena. ʻO Pneumatic Valve kahi hoʻi o ka pukaʻana o ka pūnāwai hoʻokahi wale nō ka hopena o ka intake e wehe i ka valve, pani waleʻia kaʻaoʻao o ka pūnāwai ma ka paniʻana i ka lewa ʻO ka hana a kēia valve kekahi o nā leo o ka lua.
