THERMOPLASTIC VALVES, ACTUATION & CONTROLS Asahi/America thermoplastic valves provide a dependable and economical way to handle corrosive chemicals, including sulfuric and hydrofluoric acid, nitric acid, oxidizing chemicals, caustic solvents, halogens and various other hostile fluids. They perform at temperatures up to 250F, pressures up to 230 psi, and flows up to 18,500 gpm. All valves meet or exceed ANSI Class VI shut-off.