Double Bleed&Block valve Flange end 150LB -2500LB Materal::A105,LF2,F11,F22,F316,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 chamber3. Trunnion supported design reduces operating torque4. Two sets of O-rings plus firesafe stem packing prevents leakage5. Corrosion ...