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