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Espresso 机器安全阀

Published : 2022-06-06 20:18:46
Categories : General

Espresso 机器安全阀

濃縮咖啡機上最重要的安全功能之一是鍋爐安全閥。這是濃縮咖啡機的最後一招

為什麼需要安全閥?壓力閥無法正常工作的最新事件之一發生在 2009 年的 Sainsbury'sElektra 濃縮咖啡機的鍋爐爆炸的地方。安裝了一種新型安全閥,但無法正常工作

典型的濃縮咖啡機鍋爐裝有水並用加熱元件加熱。看到它是一個封閉的鍋爐,鍋爐內部的壓力和溫度都會增加。通常該元件由壓力開關控制,當鍋爐內的壓力達到一定壓力時,壓力開關將切斷加熱元件的電源。一旦壓力下降,加熱元件將再次開始打開。

但是這個壓力開關有可能發生故障,所以現在您遇到了加熱元件的電源不再關閉的情況。並且會持續加熱鍋爐內的水並增加鍋爐內的蒸汽壓力。

在某些情況下,還安裝了鍋爐恆溫器或加熱元件恆溫器。這將在達到預設溫度並需要手動重置時關閉電源。

但是,如果恆溫器不存在或出現故障,安全閥將在預設壓力下打開,並將過壓釋放出濃縮咖啡機。這樣可以防止鍋爐爆炸。

安全閥如何工作?

安全閥本身有一個黃銅閥體,內外都有螺紋。該閥門內部有 4 個組件(請注意,這可能因型號和品牌而異)。第一項是黃銅墊圈支架,裡面有墊圈。該墊圈通常密封鍋爐以防止蒸汽逸出。該墊圈支架通過錐形彈簧支架固定到位。在此之上,您會發現一個不銹鋼壓縮彈簧。最後,為了保持一切就位,您將擁有一個黃銅固定螺釘。閥門的開啟壓力是工廠預設的。當您需要高開啟壓力時,固定螺釘向內旋入。當您想要較低的開啟壓力時,它被擰到外面。

濃縮咖啡機有哪些類型的安全閥?

安全閥有多種配置。諸如螺紋類型、密封材料、壓力、閥門材料、認證、彈簧類型、可測試等。

螺紋類型:

在大多數濃縮咖啡機安全閥上,它是外螺紋。最標準的螺紋類型是 3/8” BSP-G,但您也可以在各種品牌上找到 ½” BSP-G ¼”BSP-G。有一些品牌也使用公制螺紋,例如 La San MarcoGaggia Pavoni

校準

用於濃縮咖啡機的鍋爐安全閥通常設置為 1.8 bar。但這也取決於它所使用的濃縮咖啡機的品牌。它們的範圍從 1,5 bar 一直到 2,1 bar。當這些安全閥通過認證時,它們在某種程度上是固定的,無法調整。例如,這是通過蓋板或銅/鉛密封件完成的,因此它們無法更改。

認證。

有些型號的安全閥沒有認證。使用這些型號,您可以調整開啟壓力。但大多數型號都通過 CEPED 或汽車認證

密封材料

對於安全閥,可以在安全閥內部使用各種類型的密封件。這可以是 nbrfkm矽樹脂和 PTFE。對於濃縮咖啡機,您通常會發現 Viton 密封件。

測試安全閥

在某些情況下,您會發現鍋爐安全閥頂部有一個環。當你拉這個環時,你會拉一個打開閥門的軸。通過此程序,您可以測試密封材料是否沒有粘在配合面上。

密封安全閥。

安全閥可用各種密封材料密封。在大多數情況下,使用可壓碎的銅墊圈。但在該領域中,您也確實看到了 PTFE 膠帶或液體密封材料的使用。

替代品

您需要多久更換一次鍋爐安全閥?您應該每 2 年更換一次。鍋爐安全閥是一種相對便宜的物品,如果它發生故障可能會產生很大的後果。

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