1.body city over pressure self relief seat/anti-static design 压力自动释放座上有孔/防静电设计 2.floating ball with pressure relief hole (uni-directional flow arrow is to be indicated on body) 压力释放孔有浮球(上面有单向箭头指示) 3.stem material:AISI 316 anti blow out 阀杆材质:美国钢铁学会AISI 316防井喷 4.flexible wedge with body city pressure relief hole (uni-directional flow arrow to be indicated on valve body) 体腔减压孔带弹性楔(阀上有单向箭头指示) 5.extended bolted bonnet 伸出的螺丝帽[收起]