I-valve yokuqondisa isando echotshozayo iyingxenye yokunemba okuphezulu.Njengamanje, kunabakhiqizi abambalwa abangayikhiqiza e-China, ngakho-ke intengo ayiphansi.
Kunezinhlobo eziningi zezinto zokuhlehlisa i-valve yesando esichotshozwayo se-excavator.Lapho ekhetha, amakhasimende kufanele abuze kuqala ukuthi iyiphi impahla eyenziwe, ngoba lena yingxenye enembayo ephezulu, futhi imikhiqizo enesici ingase yenze yonke imfucumfucu yesando echotshozayo, ngakho-ke sifuna ukuthenga imikhiqizo yekhwalithi ephezulu.