1.25 year's experience in gear box 2.CE ISO9001 3.Excellent quality ... Description The reducers include 4 kinds of series: ZDY(single-stage), ZLY(two-stage), ZSY(three-stage), ZFY( ... alloy steel and treated with carburization, quencher, gear grinding. The precision of gear is grade 6. 4. The running ... valve can be equipped to meet the rotation with single direction. 3. Big power can be equipped to ...