Ma keʻano he mea i hoʻohanaʻia no kaʻikeʻana i ka mana on-off a me ke kahe o ka'ōnaehana pipeline, ua hoʻohana nuiʻia ka valve butterfly i hoʻopaʻaʻia i nā mea he nui e like me kaʻaila, kaʻoihana kemika, ka metallurgy, hydropower a pēlā aku.Hoʻokomo ʻia ka disc o ka valve butterfly sealing soft i ka vertical ...
Heluhelu hou aku