the valve body is approximately a cylindrical , spherical and the center of the spool valve shaft design between the center of rotation of an eccentricity , when driven spool valve shaft is rotated, the spool valve relative to the center of the spherical eccentrically rotating spool of flexible arm is elastically deformed , so that the spherical valve body and the valve seat snug fit achieve a reliable seal , so that the valve , also known as flex cam valve . this product is imported from the United States Masoneilan product . main feature: 1 , sealing well . 2 , a greater rated flow coefficient . 3 , two high flow dynamic stability. 4 , wide temperature range. 5 , compact, light weight , and easy to install . 6 , the valve flow path is simple , suitable for high viscosity media containing particles . Technical Parameters *******2, *******2, *******2, *******2, *******2, *******2, *******2, *******2, *******2, *******2, *******2, *******2, *******2, *******2, *******2, *******2, *******2, *******2, *******2, *******2, *******2, *******2, *******2 pneumatic rotary valve