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. RF standard: ASME/ANSI B16.5. Sealing pressure test: 22 BAR. Shell pressure test: 30 BAR.