传统总线阀岛依赖专用汇流排底座，扩展需重复采购、电磁阀无法任意位置安装。西维四线制总线式方案只需替换通信盖板并配合耦合器，即可在阀体结构范围内任意数量扩展与位置分布。

Traditional bus valve islands rely on dedicated busbar bases, and expansion requires repeated procurement. Electromagnetic valves cannot be installed in any position. The Xiwei four wire bus scheme only needs to replace the communication cover plate and cooperate with the coupler to expand and distribute any number of positions within the valve body structure range.