Design & Manufacturing Standard API 602, ASME B16.34 Face to face(end to end) ASME B16.10, API 6D Flange Connection Size ASME B16.5 Butt Welding Size ASME B16.25 Pressure-Reference Temperature ASME B16.34 Test and inspection API 598, API 6D Straight pattern body design Tapered, globe, or plug disc Renewable or welded seat Bolted bonnet or pressure sealed bonnet, back seal structure Impact ...