The paper deals with the modernization of the AERZEN VML60 screw compressor. in which the synchronizing gears were replaced by a chain variator with hydraulic pulley pitch control. This solution significantly improved propeller speed control. increased control accuracy. https://safeersappliancers.shop/product-category/zanussi-zcv46250ba-electric-cooker-ceramic-hob-black-a-a-rated-55cm/