Ma valve owunikira angagwiritsidwenso ntchito pa mapaipi pomwe kupanikizika mu dongosolo lothandizira kumatha kukwera pamwamba pa kuthamanga kwa dongosolo. Check mavavu akhoza makamaka...
Mfundo yogwirira ntchito ya valavu yachipata chamanja: Sinthani gudumu lamanja. Kupyolera mu chiyanjano ndi kusagwirizana kwa ulusi pakati pa handwheel ndi tsinde la valve ...