90^o回转青铜球阀：
　　QUARTER-TURN BRONZE BALL VALVES:

　　按照美国阀门和管件制造商标准化协会MSS-SP110标准制造，额定非冲击冷水工作压力为600 psi。阀体应该是焊接连接，三件式结构，便于铜焊安装时的拆卸。阀门应配置聚四氟乙烯阀座，不缩径全流道，防吹出阀杆和镀铬黄铜/青铜球体。新购买的阀门应该经过制造商的清洗和包装，适用于氧气管道系统。
　　Manufactured in compliance with MSS-SP-110 and rated 600 psi non-shock cold working pressure are to be used. Body shall have solder ends and 3-pc. design permitting disassembly for brazing installation. Valve to have TFE seats, full-port, anti-blowout stems and chrome-plated brass/bronze ball. Valve shall be provided by manufacturer cleaned and bagged for oxygen service.
　　可采用的阀门：
　　美国尼伯科S-595-YX球阀（焊接）
　　ACCEPTABLE VALVES:
　　NIBCO S595-YX (solder)
　　可采用的阀门，带6英寸连接端：
　　美国尼伯科CS-595-YX-EC球阀（焊接，带加长阀罩）
　　美国尼伯科CS-595-66-EC球阀（焊接，带加长阀罩和不锈钢阀内件）
　　ACCEPTABLE VALVES W/6" STUB ENDS:
　　NIBCO CS595-YX-EC (solder w/expanded cup)
　　NIBCO CS595-66-YX-EC (solder w/expanded cup and stainless steel trim)

　　注意：
　　NOTE:

　　如果要求管道处于绝缘状态，所选的球阀应该配置2英寸加长不导热手柄。此外，还要配置保护性套管，使得操作阀门时不会破坏气体密封或绝缘性能。
　　Where piping is insulated, ball valves shall be equipped with 2" extended handles of non-thermal conductive material. Also, provide a protective sleeve that allows operation of the valve without breaking the vapor seal or disturbing the insulation.
　　可采用的阀门：
　　美国尼伯科S-595-YXNS球阀（焊接）
　　ACCEPTABLE VALVES:
　　NIBCO S595-YXNS (solder)