高温安全阀安装调试以及选用设计

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　　2.1ZHONGCHUISHI。YIZHONGCHUIWEIHEZAI,ZHIJIEJIAZAIFABANSHANG。MUQIANYIZHUJIANTAOTAI。

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　　2.3DANHUANGSHI。DANHUANGSHIANQUANFAZHUYAOYIKAOZUOYONGZAIFABANSHANGDEDANHUANGLIKONGZHIFADEQIBI，JUYOUJIEGOUJINCOU、TIJIXIAO、ZHONGLIANGQINGHEQIBIDONGZUOKEKAODEYOUDIAN。GONGYISHEBEI、GUANDAOSHANGDEANQUANFAYIBANCAIYONGDANHUANGSHI，FATIXIAO、LINGMINDUHAO,SHIYONGYUGEZHONGQI、YETIDEXIEYA。DANHUANGSHIANQUANFAZHONGYOUYOUFENGBIHEBUFENGBIDE，YIBANYIRAN、YIBAOHUOYOUDUDEJIEZHIYINGXUANYONGFENGBISHI，ZHENGQIHUODUOXINGQITIDENGKEYIXUANYONGBUFENGBISHI，ZAIDANHUANGSHIANQUANFAZHONGHAIYOUDAIBANSHOUHEBUDAIBANSHOUDE。BANSHOUDEZUOYONGZHUYAOSHIJIANCHAFABANDELINGHUOCHENGDU，YOUSHIYEKEYIYONGZUOSHOUDONGJINJIXIEYAYONG。

　　2.4先导式(脉冲式)。利用导阀与主阀连在一起，通过导阀的脉冲作用驱动主阀动作。适用于大口径、大排量及高压系统。先导式安全阀与导阀采用无缝管接通，由先导阀来感测被控压力信号并控制主阀的启闭。其动作过程是：当安全阀的阀前压力低于整定压力时，先导阀整定弹簧将阀芯推向阀座密封面，气体介质经导阀进口进入主阀阀芯上腔，使阀芯下移贴紧阀座，导阀和主阀都处于无泄漏的关闭状态；当阀前压力达到或高于整定压力时，介质压力克服整定压力，弹簧将导阀阀芯推向上移，导阀受力面积由阀芯面积转化为活塞受力面积，受力面积增加上升力增大，导阀开启。主阀阀套上腔内的气体从导阀出口排出，主阀打开，介质迅速排放，活塞行程到大位置。当介质压力排放到一定压力时，通过活塞阻尼孔的介质压力使活塞上下两端产生面积压差平衡，启闭压差由活塞上下两端面积压差平衡实现，当阀前压力降回到工作压力以下时，在较小弹簧力作用下，阀芯下移实现其密封。导阀关闭，主阀也就随之而关闭。

　　3ANQUANFADEANZHUANGSHEZHI

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　　4JIEYU

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