ASME B16.34 CF3 Stainless Steel Gate Valve Manufacturer Offers ASME B16.34 CF3 Stainless Steel Gate Valve, 32 Inch, Class 300 (300 LB), Flanged RF Ends. Key Specifications / Features Size: 32 Inch Pressure Rating: Class 300. Body/Bonnet: CF3. Connect Ends: Flanged. Standards Design and Manufacture: ASME B16.34. Face to Face: ASME B16.10. Flanged Ends: ASME B16.5. Test and Inspection: API 598.