China Gate Valve manufacturer Valmax supplies Gate Valve, seat made of ASTM A105N, featured with API 602, BS 5352 Valve standard, ASME B16.11 SW standard. Body/bonnet: ASTM A105N. Wedge: ASTM A105N. Seat: ASTM A105N. Valve standard: API 602, BS 5352. SW standard: ASME/ANSI B16.11. Sealing pressure test: 169 BAR. Shell pressure test: 230 BAR.