Ma valve otulutsa mpweya amagwiritsidwa ntchito mu mpweya wamapaipi a makina otenthetsera odziyimira pawokha, makina otenthetsera apakati, ma boilers otenthetsera, mpweya wapakati wotulutsa mpweya, kutentha pansi ndi makina otenthetsera dzuwa. Mfundo yogwirira ntchito: Pakakhala kusefukira kwa gasi m'dongosolo, gasi amakwera payipi ...
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