China Check Valve manufacturer Valmax supplies Check Valve, Body/bonnet, disc, seat made of ASTM A105, featured with API 602, BS 5352 Valve standard. Body/Cap: ASTM A105. Disc: ASTM A105. Seat: ASTM A105. Valve standard: API 602, BS 5352. SW standard: ASME/ANSI B16.11. Sealing pressure test: 154 BAR. Shell pressure test: 250 BAR.