... ., Ltd. is a specially appointed enterprise producing all sorts of speed reducers in Northern China.Main products: ZDY, ZLY, ZSY, ZFY, DBY ... -L, and NGW-S planet gear speed reducers; B and X series of cycloidal planetary gear speed reducers; ZQ, ZD, ZL, ZS, and ZSC ... WD series, M-type and A-type vertical worm gear reducers; YTC and YCJ speed reducing motors and Y-type 315-630 oil ...