Double Bleed&Block valve Flange end 150LB -2500LB Materal::A105,LF2,F11,F22, ... ,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 chamber3. Trunnion ...