... 300lbs 8) Operating type: Worm gear, pneumatic actuator7) Packing: Graphite 25Cr1MOV 6) Stem material: 410(1Cr13), 420(2Cr13), 304, 316 ... Valve 8) Operating type: Worm gear, pneumatic actuator7) Packing: Graphite 25Cr1MOV 6) Stem material: 410(1Cr13), 420(2Cr13), 304, ... Valve 8) Operating type: Worm gear, pneumatic actuator7) Packing: Graphite 25Cr1MOV .6) Stem material: 410(1Cr13), 420(2Cr13), 304, ...