This standard specifies the classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of marine proportional electromagnets. This standard is applicable to the proportional electromagnets of various types of marine hydraulic proportional control components using hydraulic oil as the working medium. The proportional electromagnets of land-based hydraulic proportional control components can also be adopted by reference. This standard does not apply to electromagnets with polarity bidirectional proportional electromagnets and electromagnets for other purposes.