Valavu yosakhala yokhazikika ndi mtundu wa valve wopanda miyezo yomveka bwino yogwira ntchito. Ntchito zake magawo ndi miyeso ndi mwapadera makonda malinga ndi ndondomeko zofunika. Ikhoza kupangidwa ndi kusinthidwa momasuka popanda kukhudza ntchito ndi chitetezo. Komabe, njira yopangira makina ikutsatirabe zofunikira za muyezo wadziko lonse.

Mapangidwe a ma valve omwe sali ovomerezeka ayenera kuganizira zomveka komanso zotheka kuchokera kuzinthu zonse. Kuphatikiza pa kudalira malingaliro achikhalidwe, mapangidwewo amafunikiranso kafukufuku wamakono ndi chitukuko. Chifukwa chake, nthawi zambiri, pali osankhika pamsika kuti amalize ntchito yofananira, ndipo mainjiniya adzapereka zojambulazo zitatha.

Mitundu ya mavavu omwe sali okhazikika amagawidwa m'magulu amadzi amadzimadzi (chipata cha penstock ndi valavu) ndi mndandanda wazitsulo zazitsulo (valavu ya butterfly, valve slide gate, goggle valve, valve discharge, etc.)

1. Mndandanda wa valve zonyansa

2. Metallurgical valve series