Oct 7, 2024 · in this study, it was aimed to convey theoretical and practical development of the double eccentric butterfly valve, which would be the first in the sector, with highly efficient,. The structural design of the pq340 eccentric hemisphere valve is similar to a three eccentric hard seal butterfly valve, which has the advantages of easy operation, no friction during opening,. Ideal for oil & gas, chemical, wastewater, and power industries, these valves ensure durability, low torque operation, and superior.