This standard specifies the terms and definitions, information confirmation, type and basic parameters, basic requirements, technical requirements, testing and inspection, inspection rules, delivery, marking, packaging, storage and quality commitment of hydraulic diaphragm metering pumps. This standard applies to hydraulic diaphragm metering pumps (hereinafter referred to as "pumps") that transport liquids with a temperature of -30 ℃ ~ 150 ℃ and a viscosity of 0.3 mm2/s ~ 2000 mm2/s.