Mlengalenga mlengalenga kumapeto kwa 30-ws vacuumpampiimachepetsedwa mosasunthika, kulola mpweya kuti ulowetse valavu yotulutsa (ma spring-onyamula ma spring) kuchokera kudzenje lotupa. Valavu yotayitsa imamizidwa mu mafuta kuti mupewe mpweya kuti usatulutse ndi kusinthasintha mosavuta pansi pa kukakamizidwa kwa mlengalenga. Pamene kusakaniza kwamlengalenga ndi mafuta ndi madzi kulowa m'malo olekanitsa mafuta ndi chingwe chotsani maluso a mafuta, madziwo amalekanitsidwa mu thanki kapena chitoliro chopopera. Gulu la Croor Crovor, valavu yotsirizika ndi chisindikizo cha rocker a valavu ya slide imaphatikizidwa kwathunthu kuti amalize okha kuchotsa komanso kutopa. Mapangidwe apadera amapangitsa kuti pampuyi ikhale yopanda tanthauzo la vacuum yayitali komanso bwino kwambiri.
Pampu ya 30-ws vacuum ili ndi mawonekedwe ogwiritsira ntchito mosavuta komanso luso logwira ntchito kwambiri. Zimagwiritsidwa ntchito makamaka m'malo onyowa okhala ndi mpweya wambiri wamadzi ndi katundu wamagesi, makamaka dongosolo lamagetsi lamagetsi lomwe limagwira ntchito nthawi yayitali.
1. Pa njira yokweza, chingwe sichingakakamize pampu, makamaka mapaipi, kuti musawononge;
2. Osakhazikitsa ma valves kapena zida zina zomwe zimatha kupanga zowonjezera pa unit yozizira.
3. Ndi zoletsedwa kukhazikitsa kuyamwavalavukapena valavu yotulutsa, apo ayi valavu ya vacuum ndi valve iwonongeka.
4. Samalani ndi kuchuluka kwa nyengo nthawi yosungirako. M'nyengo yozizira, pewani kuwonongeka pachivundikiro chifukwa cha kuzizira kwa madzi ozizira. Kumbukirani kutsegula mapulagi okwirira pansi pa zofunda ndi kumbuyo kuti mukwere madzi onse ozizira.