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kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu ukuthi kube yilula kakhulu uk

Kuyinto ukukhetha isivale esisha, kufanele ukukhetha isivale esisha ngokwemizamo yabo, njengoba isivalo esisha se-rubber seal butterfly kufanele kube sesekelwe ukusebenzisa ekhaya okungenani amagredli amabili emithathu kwi-pipeline, uma kungenzeka kubonakala ukuthi kunezinye izikhathi, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele kube nesikhathi eside, kufanele

Kwesokunxele, ukukhetha i-valve enhle ekhethweni kwamaparamitha kufanele kube nokubuka kwemvelo yevalve yayo, kunezinye izinhlamvu zevalve ezisebenzisa izinto ezifanele, izivalve ezinikezwe zokudlula okuningi, izivalve ezinzima, ngeshwa, noma ukuthenga kancane, ubude bokudlula kwezivalve akuyinto eyenzayo, izivalve azizoba zingcono.

Umbuso, ukuze ukulinda i-valve, okokuqala, akukwaziwa ukusebenzisa i-valve, kufanele isondelwe ngendawo ethandwa, ethuthukisiwe, ukuze kungaphazamisi ukubonakala kwelanga noma ukunethezeka, inkampani yevalve kufanele ishibe ngokuvamile, akufanele kube nokujikeleza, ekwenzeni okungapheli; okwesibili, i-valve esebenzisa kufanele ihlaziwe ngokuvamile futhi ihlaziwe, i-rust rust, i-lubrication lubrication, ukuze kube nokuphila okuphelele kwe-valve, ukuze i-valve ibe nokuphila okuphelele.