China Valve manufacturer Valmax supplies Forging Ball Valve, seat made of NYLON, ball made by ASTM A182 A105, featured with ASME B16.5 Flange standard. Body/Bonnet: ASTM A182 A105. Ball: ASTM A182 A105. Seat: DEVLON. Stem: ASTM A182 A105. Valve standard: API 6D. Flange standard: ASME/ANSI B16.5.