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安全阀结构主要有两大类：弹簧式和杠杆式。弹簧式是指阀瓣与阀座的密封靠弹簧的作用力。杠杆式是靠杠杆和重锤的作用力。随着大容量的需要，又有一种脉冲式安全阀，也称为先导式安全阀，由主安全阀和辅助阀组成。当管道内介质压力超过规定压力值时，辅助阀先开启，介质沿着导管进入主安全阀，并将主安全阀打开，使增高的介质压力降低。

 

溢流阀一般有两种结构：1、直动型溢流阀 。2、先导式溢流阀。
对溢流阀的主要要求：调压范围大，调压偏差小，压力振摆小，动作灵敏，过载能力大，噪声小。
先导型溢流阀的导阀部分结构尺寸较小，调压弹簧不必很强，因此压力调整比较轻便。但因先导型溢流阀要在先导阀和主阀都动作后才能起控制作用，因此反应不如直动型溢流阀灵敏。
与三节同心结构相比，二节同心结构的特点是：①主阀芯仅与阀套和主阀座有同心度要求，免去了与阀盖的配合，故结构简单，加工和装配方便。②过流面积大，在相同流量的情况下，主阀开启高度小；或者在相同开启高度的情况下，其通流能力大，因此，可做得体积小、重量轻。③主阀芯与阀套可以通用化，便于组织批量生产。
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力士乐直动式溢流阀DBDS6K18/050

按作用原理分
按作用原理分类，可以分为直接作用式安全阀和非直接作用式安全阀。
1.直接作用式安全阀
直接作用式安全阀是在工作介质的直接作用下开启的，即依靠工作介质压力的作用克服加载机构加于阀瓣的机械载荷，使阀门开启。这种安全阀具有结构简单，动作迅速，可靠性好等优点。但因为依靠结构加载，其载荷大小受到限制，不能用于高压、大口径的场合。
2.非直接作用式安全阀
这类安全阀可以分为先导式安全阀、带动力辅助装置的安全阀。
先导式安全阀是依靠从导阀排出的介质来驱动或控制的。而导阀本身是一个直接作用式安全阀，有时也采用其他形式的阀门。先导式安全阀适用于高压、大口径的场合。先导式安全阀的主阀还可以设计成依靠工作介质来密封的形式，或者可以对阀瓣施加比直接作用式安全阀大得多的机械载荷，因而具有良好的密封性能。同时，它的动作很少受背压的影响。这种安全阀的缺点在于它的可靠性同主阀和导阀有关，动作不如直接作用式安全阀那样迅速、可靠，而且结构较复杂。
带动力辅助装置的安全阀是借助于一个动力辅助装置，在低于正常开启压力的情况下强制安全阀开启。这种安全阀适用于开启压力很接近于工作压力的场合，或需定期开启安全阀以进行检查或吹除粘着、冻结的介质的场合。同时，也提供了一种在紧急情况下强制开启安全阀的手段。
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力士乐直动式溢流阀DBDS6K18/050