GB/T 786.3-2021 Active

This document supplements GB/T 786.1 and GB/T 786.2, and specifies the rules for creating and combining element symbols that can be connected in loop diagrams, in order to reduce the design workload and the number of pipelines in loop diagrams. This document specifies the rules for creating and combining symbols corresponding to modules that constitute the functions of functional units, such as oil circuit blocks, superimposed valve groups, or air source processing devices (FRL devices). The rules in this document are not only conducive to the design of loop diagrams, but also facilitate the understanding of loop diagrams that use symbol modules to represent combined elements. This document includes application examples of the corresponding rules. Note: Typical application examples that comply with the rules of this document are given in the appendix. Table 1 summarizes the typical applications of the rules of this document in each appendix example.