Dual Plate Check Valve(flange type) 1. Design&Mamufacture: API 594, API 6D 2. Face-to-face API 594, API 6D, DIN 3202 3. Flange end: DIN2543-2548, API605, ASME B 16.47, ANSI B 16.5 4. Inspection and test: API 598 5. Nps: 2"-60" 6. Pressure: Class 150-2500Lb 7. Materials: WCB. WCC. LCB. LCC. WC6. WC9. C5. C12. CF8. CF8M. CF3. CF3M. CF8C. CN7M 8.Applicable medium: Water, oil, gas and other causticity medium We pursue the best quality. The best Dual plate check valve, JONLOO makes If you want more detailed information or price please send ur inquiry to us.