Valve ni chigaŵa cha kulaŵilira mu ndondomeko ya kupereka maji na milimo ya nga ni kudumura - off, kulongozga, kupatuska, kukanizga kuwelera nyuma, kulongozga, shunt panji kupumura kwa kusefukira.
Mavavu ghakulongozgera maji, kufuma ku mavavu ghambura kusuzga ghakujara-kufikira ku mavavu ghakupambanapambana agho ghakugwiriskirika nchito mu ndondomeko zakulongozgera zakusuzga chomene, na vimanyikwiro vyakupambanapambana na vimanyikwiro. Mavavu ghangaseŵezeskeka kuti ghalongozge umo maji gha mitundu yakupambanapambana ghakuchitira nga ni mphepo, maji, nthunzi, vyakuvunda, mathipa, mafuta, vitsulo vya maji na vyakuvunda vya radioactive. Mavavu ghakugaŵikaso mu mavavu gha chisulo, mavavu gha chisulo, mavavu gha chisulo chambura zimbiri (201,304,316, na vinyake), mavavu gha chisulo cha chrome, mavavu gha chisulo cha vanadium, mavavu gha chisulo cha vigaŵa viŵiri, mavavu gha pulasitiki, mavavu ghambura kupangika.
