This RISC-V industrial firewall is a specialized security product engineered specifically for the network protection of city gas industrial control systems (ICS). It stands as the industry's first industrial firewall built on the RISC-V architecture, integrating leading-edge RISC-V CPUs, localized NIC chips, and an independently developed secure operating system. By achieving full technological autonomy while adhering to high-reliability industrial hardware standards, this firewall ensures uninterrupted, long-term stability within the demanding environments of city gas operations.