Product Item: ASTM A216 WCB Wafer Check Valves
Standard: API 594
Body Material: ASTM A216 WCB
Disc Material: ASTM A351 CF8M
Size: 3 Inch
Pressure: Class 900 LB
Surface Treatment: Silver Painting

Source: https://www.landee.cn/astm-a216-wcb-wafer-check-valves-api-594-3-inch-cl900-lb.html