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Posté 03/04/2020 05:02 Vertical oil-free reciprocating (piston) vacuum pump: There is no need for lubricating oil in cylinder, which can avoid oil pollution and be used to recover high purity gas. Vertical oil-free reciprocating (piston) vacuum pump technology specification: ModelCapacity （L/s）Motor power （kW）Rotary speed (r/min)Ultimate pressure（Pa） WL-50/WLW-505043552600 WL-100/WLW-1001007.53502600 WL-200A/WLW-200A200223002600 WL-300/WLW-300300303002600 WL-600/WLW-600600453202600 WL-1200/WLW-12001200902002600 Reciprocating Vacuum Pump website:http://www.zbssv.com/reciprocating-vacuum-pump/