力士乐安全阀DBDH6K1C/210E

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安全阀在系统中起安全保护作用。当系统压力超过规定值时，安全阀打开，将系统中的一部分气体/流体排入大气/管道外，使系统压力不超过允许值，从而保证系统不因压力过高而发生事故。
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。

 

按结构分
按其整体结构及加载机构的不同可以分为重锤杠杆式、弹簧式和脉冲式三种。
1.重锤杠杆式安全阀
重锤杠杆式安全阀是利用重锤和杠杆来平衡作用在阀瓣上的力。根据杠杆原理，它可以使用质量较小的重锤通过杠杆的增大作用获得较大的作用力，并通过移动重锤的位置(或变换重锤的质量)来调整安全阀的开启压力。
重锤杠杆式安全阀结构简单，调整容易而又比较准确，所加的载荷不会因阀瓣的升高而有较大的增加，适用于温度较高的场合，过去用得比较普遍，特别是用在锅炉和温度较高的压力容器上。但重锤杠杆式安全阀结构比较笨重，加载机构容易振动，并常因振动而产生泄漏；其回座压力较低，开启后不易关闭及保持严密。
2.弹簧微启式安全阀
弹簧微启式安全阀是利用压缩弹簧的力来平衡作用在阀瓣上的力。螺旋圈形弹簧的压缩量可以通过转动它上面的调整螺母来调节，利用这种结构就可以根据需要校正安全阀的开启(整定)压力。弹簧微启式安全阀结构轻便紧凑，灵敏度也比较高，安装位置不受限制，而且因为对振动的敏感性小，所以可用于移动式的压力容器上。这种安全阀的缺点是所加的载荷会随着阀的开启而发生变化，即随着阀瓣的升高，弹簧的压缩量增大，作用在阀瓣上的力也跟着增加。这对安全阀的迅速开启是不利的。另外，阀上的弹簧会由于长期受高温的影响而使弹力减小。用于温度较高的容器上时，常常要考虑弹簧的隔热或散热问题，从而使结构变得复杂起来。
3.脉冲式安全阀
脉冲式安全阀由主阀和辅阀构成，通过辅阀的脉冲作用带动主阀动作、其结构复杂，通常只适用于安全泄放量很大的锅炉和压力容器。
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力士乐安全阀DBDH6K1C/210E


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。
力士乐安全阀DBDH6K1C/210E
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力士乐安全阀DBDH6K1C/210E