Double Bleed&Block valve Flange end 150LB -2500LB Materal::A105, ... ,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 ... not included)11. NACE MR0175 (Superseded by ISO 15156)12. Anti-blowout trunnion stem design StandardsThese valves comply with ...