... 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 ... the applicable requirements of the following standards:Design and manufacture:API6D,BS5351,API608,ASME 16.34Face ...