E le moetsi ea etellang pele oa li-valve tsa indasteri, Comparen o motlotlo ho hlahisa sehlahisoa sa rona se secha - emisa li-valves. Phula ena e phahameng ea boleng e etselitsoe ho fana ka ts'ebetso e phahameng le ho ts'epahala, 'me likarolo tsa eona tse ikhethang li etsa hore e be le lits'ebetso tse fapaneng tsa lits'ebetso tse fapaneng.