Vavu yoyimitsa ndi valavu yotchinga, yomwe imagwira ntchito makamaka podula payipi.
Thevalavu yapadziko lonseNdi valavu yomwe imagwiritsidwa ntchito kwambiri, ndipo ndiyonso yoyenera kwambiri pakuboola. Chifukwa chakuti ili ndi magwiridwe antchito abwino osinthira, ndipo poyerekeza ndi mitundu ina ya mavalavu, kufalikira kwa kuwonongeka kozungulira mpando wa valavu yoyimitsa chifukwa cha kukokoloka kumakhala kofanana.
Vavu ya globe ndi valavu yokakamiza kutseka. Chifukwa chake, momwe mungasankhire bwino valavu ya globe iyenera kukanikiza ku chivundikiro chachikulu ikatsekedwa, kuti pasatuluke kutuluka pakati pa malo awiri otsekera. Popeza mphamvu yotsekera ya globe valve ndi mphamvu yapakati zili pa mzere womwewo, ndipo malangizowo ndi osiyana, mphamvu yotsekera sikuti ingangokulitsidwa, komanso imagonjetsa kupsinjika kwa medium, kotero mphamvu yotsekera yomwe globe valve imafuna ndi yayikulu kwambiri kuposa ya gate valve.
Chisamaliro chapadera chiyenera kuperekedwa posankha valavu yozungulira. Vavu yozungulira yokhala ndi mphete yotseka singagwiritsidwe ntchito pa zinthu zodetsedwa kapena zinthu zozungulira zomwe zili ndi tinthu tolimba. Mu njira iyi, ndibwino kugwiritsa ntchito malo otsekera ocheperako kuti mutseke.
Kawirikawiri, ma valve odulira amalimbikitsidwa kuti azigwiritsidwa ntchito popopera, kulamulira, komanso makina opopera amphamvu; ma valve odulira amatha kusankhidwa kuti agwiritsidwe ntchito pokonza malo awiri, kuwunikira ndi kapangidwe kakang'ono, palibe zofunikira zokhwima pa kutalika kwa kapangidwe, kutsika kwa mphamvu zochepa (kusiyana pang'ono kwa mphamvu), ndi kutentha kwambiri. Mu matope, sing'anga yokhala ndi tinthu ta thupi lomwelo, kukana kuwonongeka, kuchepa kwa m'mimba mwake, kuchitapo kanthu mwachangu (kutembenuka kambiri kapena kutsegula ndi kutseka), komanso mphamvu yochepa yogwirira ntchito, yesetsani kusasankha valavu yoyimitsa; ikafunika kutseka bwino, kutsika kwa mphamvu zambiri (kusiyana kwakukulu kwa mphamvu)), phokoso lochepa, kutsekeka kwa mpweya ndi nthunzi, kutuluka pang'ono kwa mpweya kupita mumlengalenga, kuzizira kwambiri, kutentha kochepa komanso kuzizira kwambiri, mutha kugwiritsa ntchito kapangidwe kapadera ka valavu yapadziko lonse.
Chinthu china chofunika kwambiri pa valavu yozungulira ndichakuti chisindikizo cha tsinde la valavu chingasinthidwe ndi bellows m'malo moyikamo kuti chipange valavu yozungulira ya bellows. Vavu yozungulira ya bellows ndi yoyenera kugwiritsidwa ntchito ngati zinthu zoyaka moto, zophulika, zapoizoni, komanso zoyera, ndipo imathanso kukwaniritsa zofunikira za dongosolo la vacuum.
Komabe, valavu yozungulira ilinso ndi zofooka zake, makamaka chifukwa cha mawonekedwe amkati mwa thupi la valavu. Mu thumba la valavu yozungulira, sing'anga imasintha kuchoka pa kuyenda kolunjika kolunjika kupita ku kuyenda kolunjika kokwera kapena kotsika, kenako kupita ku kuyenda kolunjika, zomwe zimapangitsa kuti kuthamanga kuchepe, makamaka m'zida zama hydraulic. Kutaya kwamtunduwu kwa kuthamanga kuyenera kukopa chidwi chokwanira.