力士乐安全阀DBDH6G1A/400

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安全阀是启闭件受外力作用下处于常闭状态，当设备或管道内的介质压力升高超过规定值时，通过向系统外排放介质来防止管道或设备内介质压力超过规定数值的特殊阀门。安全阀属于自动阀类，主要用于锅炉、压力容器和管道上，控制压力不超过规定值，对人身安全和设备运行起重要保护作用。注安全阀必须经过压力试验才能使用。

安全阀是阀门家族比较特殊的一个分支，它的特殊性是因为不同于其它阀门仅仅起到开关的作用，更重要的是起到保护设备的安全。随着我国经济建设的快速发展，在带有压力操控的设备项目工程越来越多。鉴于设备泄压的需要，安全阀在保护设备过程中起到至关重要的作用。截止2013年各类安全阀制造商和贸易商已超过700多家，每日交易询盘达到200多条，安全阀供求市场明显升温。通过*季度数据初步分析，安全阀需求量要高出二十个百分点。安全阀是锅炉、压力容器和其他受压力设备上重要的安全附件。安全阀(又称泄压阀)是根据压力系统的工作压力(工作温度)自动启闭，一般安装于封闭系统的设备或管路上保护系统安全。当设备或管道内压力或温度超过安全阀设定压力时，自动开启泄压或降温，保证设备和管道内介质压力(温度)在设定压力(温度)之下，保护设备和管道正常工作，防止发生意外，减少损失。安全阀主要被广泛应用于：蒸汽锅炉、液化石油气汽车槽车或液化石油气铁路罐车、采油井、蒸汽发电设备的高压旁路、压力管道、压力容器等。安全阀一般按结构形式分为弹簧式安全阀和杠杆式安全阀、脉冲式安全阀，其中弹簧式安全阀应用*为普遍;按连接方式分为螺纹安全阀和法兰安全阀。安全阀口径一般都不大，常用的都在DN15mm-DN80mm之间，超过150mm一般都称为大口径安全阀。2013年安全阀行业市场规模扩大，这已是一个不争的事实。我国能够有资质生产安全阀会。

 

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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R900572908 DBDS10G1X/375B
R901419086 DBDS10G1X/375E
R900424744 DBDS10G1X/400
力士乐安全阀DBDH6G1A/400


按介质分
按照介质排放方式的不同， 安全阀又可以分为全封闭式、半封闭式和开放式等三种。
1.全封闭安全阀
全封闭式安全阀排气时，气体全部通过排气管排放，介质不能间外泄漏，主要用于介质为有毒。易燃气体的容器。
2.半封闭式安全阀
半封闭式安全阀所排出的气体一部分通过排气管，也有一部分从阀盖与阀杆间的间隙中漏出，多用于介质为不会污染环境的气体的容器。
3.开放式安全阀
开放式安全阀的阀盖是敞开的，使弹簧腔室与大气相通，这样有利于降低弹簧的温度，主要适用于介质为蒸汽，以及对大气不产生污染的高温气体的容器。

按阀瓣开启分
按照阀瓣开启的*大高度与安全阀流道直径之比来划分，安全阀又可分为弹簧微启封闭高压式安全阀和弹簧全启式安全阀两种。
1.弹簧微启封闭式高压安全阀
微启式安全阀的开启高度小于流道直径的1/4，通常为流道直径的1/40一1/20。微启式安全阀的动作过程是比例作用式的，主要用于液体场合，有时也用于排放量很小的气体场合。
2.弹簧全启式安全阀
全启式安全阀的开启高度大于或等于流道直径的1/4。全启式安全阀的排放面积是阀座喉部*小截面积。其动作过程是属于两段作用式，必须借助于一个升力机构才能达到全开启，全启式安全阀主要用于气体介质的场合。
3.中启式安全阀
开启高度介于微启式与全启式之间。即可以做成两段作用，也可以做成比例作用式。
力士乐安全阀DBDH6G1A/400
R900340395 DBDS10G1X/400SO32
R900337132 DBDS10G1X/400W1
R901421159 DBDS10G1X/400-320
R900967544 DBDS10G1X/400-330
R901283265 DBDS10G1X/400-350
R900934571 DBDS10G1X/400-350V
R900558953 DBDS10G1X/400-370
R901243540 DBDS10G1X/400-400
R900342738 DBDS10G1X/400/12
R900482135 DBDS10G1X/400/12SO150
R900535540 DBDS10G1X/400/2
R900471909 DBDS10G1X/400/5
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R900358827 DBDS10G1X/50V/12
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R900442462 DBDS10G1X/60VB
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R900423814 DBDS10G1X/630
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R900470981 DBDS10G1X/630SO48
R900461768 DBDS10G1X/630SO52
R900781731 DBDS10G1X/630-620
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R900786769 DBDS10K1X/100-065
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R901002674 DBDS10K1X/100-35
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R900424158 DBDS10P1X/315
力士乐安全阀DBDH6G1A/400