Choyamba: valavu handwheel diameters ndi mphamvu zochepa, ndipo ena anaona yaing'ono gudumu m'mimba mwake 300 pamene anthu atatu kapena anayi ntchito n'zosavuta kuwononga, choncho tiyenera kulabadira valavu handwheel diameters zosakwana 320mm ndi pamene munthu mmodzi ntchito.
Chachiwiri: valavu handwheel mu chikhalidwe wamba, udindo wa udindo wa gudumu dzanja angakhalenso mavavu athu ali ofanana, valavu handwheel ntchito ayenera kukhala wotchipa pafupi counterclockwise ayenera lotseguka.
Chachitatu: gudumu lamanja la ma valve lopangidwa ndi kukula limayendetsedwa, choncho nthawi zina timabwereka zina kuti titsegule ndi kutseka ma valve, chofunika kwambiri ndikusunga malamulo athu. Zabwino kwambiri zosalala kuti zisawononge zisindikizo za valve.
