原文：
全启式安全阀和微启式有什么区别： 什么是微启式安全阀：A41H-**-**，是指安全阀的开度高度是微量的，不允许突然开启或关闭产生“水锤”现象，主要用于液体介质；他的典型特征是进出口口径相同。 什么是全启式安全阀：A42Y-**-**，当阀芯升高到与阀座的环形面积相当于阀座内径面积时（升高的高度×阀芯密封面的周长所产生的面积=阀芯密封面的面积），就是全部开启了；其典型特征是出口口径大于进口口径。 1、全启式安全阀和微启式安全阀的的主要区别在于其开启高度的不同，一般微启式安全阀的开启高度为其阀座喉径的1/20~1/40，而全启式安全阀的开启高度则为其阀座喉径的1/4以上。 2、选型注意事项：①安全阀的排放量必须大于容器的安全泄放量；②操作压力要求{jd1}平稳的容器，应考虑选用微启式安全阀（如压缩机汽缸）；③高压容器、大型容器以及安全泄放量大的中、低压容器{zh0}选用 全启式安全阀（如反应釜类设备）。 3、安全阀的开启高度是指：阀瓣离开关闭位置的实际升程。

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译文：
Safety valve and Weiqi What's the difference: What is Weiqi safety valve: A41H-**-**, is the safety valve opening height of a trace, and not allowed to open or close suddenly have a "water hammer" phenomenon, mainly used for liquid medium; his typical feature is the import and export the same caliber. What is a safety valve: A42Y-**-**, When the valve core and valve seat ring rises to an area equivalent diameter of the valve seat area (for increasing the height × the circumference of the spool sealing surface generated area = spool sealing surface area), that is, all opened; its diameter is greater than the typical characteristics of the export import caliber. 1, safety valve and Weiqi The main difference between the valve opening height in its different, the general Weiqi safety valve opening height of its seat throat diameter of 1 / 20 ~ 1 / 40, while the whole Kai-type valve seat opening height of his throat diameter of 1 / 4. 2, selection Note: ① safety valve emissions must be greater than vessel safety discharge; ② absolutely stable operating pressure for the container, safety valve should be considering the selection of Weiqi (such as compressor cylinders); ③ high pressure vessel, large containers and large amount of safety relief valves, low pressure vessel to choose a safety valve (such as reactor type equipment). 3, the opening height is the safety valve: the valve flap from the closed position of the actual lift.