China Valve For Sale Design standard: BS 1868, API 6D, BS 5352, ISO 15761. Flange connection dimension: ASME B16.5, ASME B16.47, MSS SP-44. Butt welding connection dimension: ASME B16.25. Socket welding end dimension: ASME B16.11. Thread end dimension: ASME B1.20.1. Face-to-face dimension: ASME B16.10, Manuf. Std. Pressure-Temperature Rating: ASME B16.34. Pressure test standard: API 598, ASME B16.34.