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先导式安全阀

先导式安全阀的用途:该安全阀阀门利用导阀压力信号打开主阀拥瓣,具有开启灵敏,回座压力高,密封性好等特点,先导式安全阀广泛使用于石油、天然气等设备或系统,作为安全保护装置。先导式安全阀的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,超过规定值时自动开启,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。对于先导式安全阀产品的选用,应按实际密封压力来确定。先导式安全阀在一种公称压力(PN)范围内,具有几种工作压力级的弹簧,订货时除注明先导式安全阀型号、名称、介质和温度外,尚应注明阀体密封压力,否则按最大密封压力供货。

波纹管安全阀

波纹管安全阀适用于存在变动背压和有毒易燃的容器设备或管路系统,作为安全保护装置。波纹管部位能有效的保护弹簧等零件腐蚀,提高产品使用寿命。波纹管安全阀用作聚脂,乙烯及尿素等装置,波纹管安全阀配备保温夹套,蒸汽吹扫接头,确保系统安全运行。波纹管安全阀适用于工作温度≤300℃的空气、蒸气、石油气等介质的设备和管路上,作为超压保护装置。当波纹管安全阀设备和管路内压力超过允许值时,阀门自动开启,继而全量排放;当压力降低到规定值时,阀门自动关闭,保证设备安全运行。波纹管安全阀被广泛应用于电力、冶金、石油、化工等工业中。

美标安全阀

美标安全阀适用介质及温度:液体,气体≤300℃ 硝酸类,醋酸类气体≤200℃ 蒸气≤550℃。美标安全阀性能:整定压力偏差:≤±3%、超压:≤10%、启闭压差:≤10%。美标安全阀密封性能:起跳回座后能保持良好的密封性,符合API Std 527标准中的规定美标安全阀特点:阀座软密封保证安全阀起跳前后的良好密封性。美标安全阀允许工作压力接近安全阀的整定压力。较小超压就能使主阀迅速达到全启状态。美标安全阀动作性能和开启高度不受背压的影响。启闭压差可调。美标安全阀导阀不流动型结构设计减少了有害介质的排放和环境污染。可在线检测美标安全阀的整定压力。

国标安全阀

国标安全阀结构主要有两大类:弹簧式和杠杆式。弹簧式国标安全阀是指阀瓣与阀座的密封靠弹簧的作用力。杠杆式国标安全阀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,也称为国标安全阀,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,并将主国标安全阀打开,使增高的介质压力降低。国标安全阀的排放量决定于阀座的口径与阀瓣的开启高度,国标安全阀也可分为两种:微启式开启高度是阀座内径的(1/15)~(1/20),全启式是(1/3)~(1/4)。

弹簧式安全阀

弹簧式安全阀在外加力FW的作用下,一个安全阀从关闭到开启,再由开启到关闭的全过程中,外附加力FW的变化规律,当附加力从零逐步增加,与内压力PL×S之和正好为弹簧预紧力时,弹簧式安全阀阀门微启,增大了介质作用面积S,使得用来克服弹簧预紧力的内压作用力急剧增大,其结果在瞬间减小了外附加力。从而出现第一个特征峰A弹簧式安全阀。当外附加力逐渐减小而达到关闭点时,由于介质作用面积忽然减小,为保持力的平衡关系,此时,外附加力会出现瞬间回升现象,即第二个特征峰点B。上述两个特征峰点A和B是在线条件下检测安全阀开启压力、回座压力的技术依据。弹簧式安全阀按阀体构造来分,可分为封闭式和不封闭式两种。弹簧式安全阀即排除的介质不外泄,全部沿着出口排泄到指定地点,一般用在有毒和腐蚀性介质中。

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