Double Bleed&Block valve Flange end 150LB -2500LB Materal ... ,F316L,F304,F304L,F51,F53,F55,F91 Good qualit Double Bleed&Block valveFlange type1. Two or Three-piece body ... design2. Double block and bleed or automatic pressure release in body ... inspection:API598/API6D Produce AbilitySize:NPS 2"-56" Pressue:Class 150-2500Material::A105,LF2,F11,F22,F316,F316L,F304, ...