1.Umubiri wa valve na spool bikozwe mubikoresho byiza, ubusobanuro butumijwe, nta peteroli yongeye gukora, kubuza neza umubiri wa valve hamwe nimpeta yo kwangirika no kwangirika nigitutu kinini. . 3.Ibice bigize igabanuka, kashe yimbere yumubiri wa valve irazamurwa, kora umubiri wa valve cyane - irwanya kandi iramba.
