概述；节流放空阀的详细资料：产品引用标准：　　API?6D　　　　　管道阀门规范?　　GB12235?　　　　通用阀门法兰连接钢制截止和升降式止回阀?　　ANSI?B16.5a?　　管法兰及法兰管件?　　JB/T79.1-79.2?　整体铸钢管法兰?　　GB/T13927?　　　通用阀门压力试验?　　JB/T9092　　　　阀门的检验与试验?主要性能规范：压力等级常温下压力试验（MPa）适用温度℃适用介质密封上密封壳体气体密封“G”型“D”型普通型抗硫型基本型公称压力PN（MPa）1.61.761.762.40.6-29～250-46～121-29～121含H 2 S和Co 2 >500Mg/m 3 的介质石油、天然气、水等2.52.752.753.750.64.04.44.46.00.66.47.047.049.60.610.011.011.015.00.616.017.617.624.00.6????????????????????主要零件的材料说明：零件名称阀体、阀盖阀瓣阀杆阀座阀杆螺母密封圈填料密封指基本名称WCB合金钢（特殊处理）不锈钢合金钢（特殊处理）铝青铜填充聚四氟乙烯填充聚四氟乙烯膨胀石墨耐油密封脂抗硫型抗硫不锈钢抗硫密封脂?主要外形尺寸：?公称压力PN（MPa）尺寸（mm）DN（mm）254050801001502002501.6L216230230310350480600730H243265346409484521594621H186108115146163202292355D0180250250300300350350400重量（Kg）1724275260125165285?2.5L216230230310350480600730H243265346409433521594621H186108115146163202292355D0180250250300300350350400重量（Kg）1724275566140180310?4.0L216230230310350480600730H243265346409433521594621H186108115146163202292355D0180250250300300350350400重量（Kg）2029326780168215372?6.4L216230230310350480600730H243265346409433521594621H186108115146163202292355D0180250250300300350350400重量（Kg）2029326780168215372?10.0L23020300380430559660787H245265287409433531709817H178106110152169225321399D0200250300350250400500500重量（Kg）29425595120240310530?16.0L230260300390450???H215265237414440???H178105110155175???D0200250300350350???重量（Kg）355065116145