The LRVS are vacuum pump packages with V-belt and pulleys transmission. It is obtained through a patented device rotating around a pivot and supporting the motor in a way, which allows to reduce loads on bearings of pump and motor and to keep tension of the belt constant in time. Different motor sizes can be used without modifying overall dimensions of the packages. The CRVS are vacuum pump packages with elastic coupling transmission and the pump rotate at the synchronous speed of the motors. LRVS and CRVS units include pump sizes from RVS 23 to RVS 60.