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This part of IEC 61987 provides - Operating Lists of Properties (OLOPs) for the description of the operating parameters and the collection of requirements for valve actuators, - Device Lists of Properties (DLOPs) for valve actuators. The structures of the OLOPs and the DLOPs conform to the general structures defined in IEC 61987-11 and IEC 61987-21 as well as to the fundamentals for the construction of LOPs defined in IEC 61987-10. The DLOPs conform additionally with terms defined in IEC 60534-7. Libraries of properties and of blocks used in the LOPs are listed in Annexes A and B respectively. The responsible committee is DKE/K 931 "Systemaspekte" ("System aspects") of the DKE (German Commission for Electrical, Electronic and Information Technologies) at DIN and VDE.