This standard specifies the terms and definitions, information confirmation, type and basic parameters, basic requirements, technical requirements, test methods, inspection rules, marking, packaging, transportation, storage and quality commitment of mechanical diaphragm metering pumps. This standard is applicable to mechanical diaphragm metering pumps (hereinafter referred to as pumps) that deliver liquids with a medium temperature of (-30 to 150) °C, a viscosity of (0.3 to 2000) mm2/s, and no solid particles.