Shanghai yuly focused on high-purity gas pipelines, centralized gas supply systems, laboratory special gas systems, biopharmaceutical pipeline systems, design and installation of large-scale special gas systems, products involving special gas cabinets gc, special gas shelf gr, valve box vmb, valve vmp, pressure relief, needle valve, ball valve, gas pipe, safety valve, one-way valve, stainless steel concourse, brass conflow, gas terminal, stainless steel dock, yellow copper docking, stainless steel non-standarded head, membrane valve, tube docking, etc