... of series: ZDY(single-stage), ZLY(two-stage), ZSY(three-stage), ZFY(four-stage), and 57 kinds of sized, 54 kinds of ... in metallurgy, mine, transportation, power, cement, building, chemical, textile and light industry. Features: 1. Compared with the former reducers, the ... as gears, shafts are made if high-strength alloy steel and treated with carburization, quencher, gear grinding. The precision of ...