This product is produced in accordance with API standard in designing manufacturing and checking;It is compact in pattern,reliable in sealing and easy to oprerate;It is used in petroleum,chemical,electric power rextile,metallurgy and other industries. Vatve manufacture and acceptance standard Design standard API600 & AIP60D Face to face ANSI B16.10 Flange standard ANSI B16.5 Temperature pressure standard ANSI B16.34 Test standard API 598 Welcome to our website to get more informations.