This is the series of carbide-faced cylindrical gear reducer, such as ZDY,ZLY,ZSY,ZFY,DBY,DCY,DFY... Carbide-Faced Cylindrical Gear Decelerators includes parallel shaft and vertical shaft. Parallel shaft decelerator is manufactured according to national standard (JB/T8853-2001). The products are optimized to advanced standard in 1980s. It includes 4 series of ZDY(single stage ), ZLY(2-stage), ZSY(3-stage) and ZFY(4-stage). Vertical shaft decelerator is manufactured according to national standard (JB/T9002-1999) and used as driving deceive that has vertical arrangement of input or output shaft, and it includes 3 series of DBT, DCY and DFY.