BS EN ISO 10434:2004 download free.Bolted bonnet steel gate valves for the petroleum, petrochemical and allied industries. The purpose of this International Standard is to establish the basic requirements and practices for flanged and butt-welding end steel gate valves of bolted bonnet construction that parallel those given in American Petroleum Institute API Standard 600, eleventh edition, 2001 (ISO 10434:1998). It...