This series High-power narrow V belt speed reducer is in the Ministry of Chemical Industry Standard (HG/T3139.9-2001) on the basis of improvement and development of products. PV-which narrow V-belt drive, PT for the belt drive, increased efficiency, long life, compact and smooth transmission, accessibility and convenient features, LPV, LPT-particularly applicable to the sewage treatment system. This series High-power narrow V belt speed reducer only a form of the output shaft, and matching supply of clamp coupling (HG5-213-65), if it has special requirements, in order to be at that. This series High-power narrow V belt speed reducer allows operation of the positive and negative direction, and can also be used with explosion-proof requirements of the occasion, accompanied by flameproof electrical addition, there must also be accompanied by special anti-static V-belt or belt.