What three partial triple eccentric valve?

What three partial triple eccentric valve? Triple eccentric valve from the center line and double eccentric valves, valve is another kind of structure, widely used in domestic time has for many years, is a very mature products, why call triple eccentric valve? Because there are 'three partial' with this valve. What is the exact 'three partial'? An: rotary center plate ( The valve shaft center) With the sealing face plate to form A dimension A bias: two partial: rotary center plate ( The valve shaft center) With the center line of the valve body to form a B bias: three partial: the center line of the valve sealing surface and seat centerline ( The center line of the body) To form an Angle is the Angle of the beta position product features three eccentric valve belongs to the rotary valve. Three eccentric on the valve plate. In the process of valve production, valve plate structure outside the outer edge of the part. Eccentric outside surface after polishing processing achieve roughness Ra. , surface plating chrome or too lai surfacing welding alloy. The hardness of HRC ~. Triple eccentric butterfly valves pressure to a maximum of MPa, low temperature resistant to - ℃, as much as ℃, sealed to achieve zero leakage.