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安全阀 阿司米阀门有限公司主要生产美标、英标、德标、日标及国标的高中压球阀、闸阀、截止阀、止回阀、蝶阀、安全阀和低温阀等约五千多种规格的阀门及管件类产品,阀体材质有碳钢、不锈钢、合金钢、超低碳不锈钢、钛钢、高镍合金和蒙乃尔合金等;驱动方式有手动、齿轮传动、电动、气动和液动,能生产阀门最高压力2500Lb(42MPa),最大通径5000mm,最高温度850℃,最低温度-196℃。
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先导式安全阀
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安全阀原理视频
  安全阀又叫泄压阀,当计量泵吐出侧管路发生阻塞时,药液可经由安全阀回流至原药桶,不致使计量泵吐出侧压力持续上升,破坏计量泵及管路,一般安全阀设定压力通常小于计量泵之最大工作压力或系统能承受压力约1KGF/CM2左右。

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先导式安全阀安装要求

先导式安全阀安装应符合下列要求:
  (l)额定蒸发量大于0.5t/h的锅炉,至少装设两个先导式安全阀:额定蒸发量小于或等于0.5t/h的锅炉,至少装一个安全阀。可分式省煤器出口处、蒸汽过热器出口处都必须装设先导式安全阀。
  (2)先导式安全阀应垂直安装在锅商、集箱的最高位置。在安全阀和锅筒或集箱之间,不得装有取用蒸汽的出口管和阀门。
  (3)先导式安全阀要有防止重锤自行移动的装置和限制杠杆越轨的导架,弹簧式安全阀要有提升手把和防止随便拧动调整螺钉的装置。
  (4)对于额定蒸汽压力小于或等于3.82MPa的锅炉,先导式安全阀喉径不应小于25mm:对于额定蒸汽压力大于3.82MPa的锅炉,安全阀喉径不应小于20mm。
  (5)先导式安全阀与锅炉的连接管,其截面积应不小于安全阀的进口截面积。如果几个安全阀共同装设在一根与锅筒直接相连的短管上,短管的通路截面积应不步于所有安全阀排汽面积的1.25倍。
  (6)先导式安全阀一般应装设排汽管,排汽管应直通安全地点,并有足够的截面积,保证排汽畅通。安全阀排气管底部应装腔 作势有接到安全地点的疏水管,在排气管和疏水管上都不允许装设阀门。

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