大口径旋启式止回阀产品概述
H44H(Y)、H64H(Y)止回阀的功能是控制管道内介质单向流向的阀门，用来防止管路中的介质倒流。止回阀属于自动阀类，启闭件靠流动介质的力量自行开启或关闭。止回阀只用于介质单向流动的管路上，阻止介质回流，以防发生事故。主要用于石油、化工、制药、化肥、电力等管路上。
大口径旋启式止回阀特点及优点
●产品的设计制造符合美国国家标准ANSI B16.34，美国石油学会标准API6D要求
●阀门承压件采用精密铸造工艺浇铸，表面质量美观，无粘沙、冷隔等表面缺陷；内在质量稳定，无疏松、砂眼、裂纹等内在缺陷。
●旋启式止回阀采用内装摇臂旋启式结构，阀门的所有启闭件都装于阀体内部，不穿透阀体，除了中法兰部位用密封垫片或密封环密封外，整体没有外漏点，杜绝了阀门外泄的可能。
●旋启式止因阀摇臂和阀瓣连接处采用球面连接的结构，使得阀瓣在360℃范围内有一定的自由度，有适当的微量位置补偿。
●旋启式止回阀密封副的密封面堆焊合金钢(13Cr)或硬质合金Slite6,即使用在有细颗粒的介质中并不会因冲蚀而很快磨损。
H44W    H44H(Y)、H64H(Y)国标止回阀设计与制造标准：
●设计与制造：　GB/T12236
●法兰尺寸：　JB/T79、GB/T9113
●压力温度：ASME B16.34、GB/T9131
●结构长度：　GB/T12221、ASME/ANSI B16.10
●对焊连接尺寸：ASME B16.25、GB/T12224
●检验与试验：　JB/T9092、GB/T13927
主要材料明细表

注:客户需求的其他材质也可采用.密封面材料配对客户内件代号决定
 
H44H(Y)、H64H(Y)主要安装尺寸及重量

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