对于法兰结构的压力释放阀，应配置法兰底座。
Thee flange seat should be provided for mounting pressure release valves.
同时进一步研究了松动螺栓数量与管道法兰结构的阻抗变化之间的关系。
Furthermore, the relation between number of loosed bolt and the change of impedance curves received on the pipeline flange was also investigated.
真法兰结构具有工厂安装的镀锌钢或316不锈钢法兰，特别适用于连接到阀门两侧。
True lug design has factory installed zinc plated or SS 316 lugs and is specially designed for connection to either side of valve.
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