包括低压头，半圆头及平头螺丝以及特殊内六角圆柱头螺钉如排空，钻孔头，自锁，等等。

Includes Low Head, Button Head, and Flat Head Screws, as well as special Socket Cap Screws such as Vented, Drilled Head, Self-Locking, and more.

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低压头和每个分支应为6毫米，非铁关断阀在每个送风和空气净化压缩为每个连接耦合仪器最低要求。

The low pressure header and each branch shall have a 6 mm minimum, non ferrous shut off valve for each instrument requiring an air supply and a compression coupling for each air purge connection.

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分析了消除附加压头的传统措施，介绍了低低压燃气调压器的工作原理及其在高层建筑中的应用。

This article analyzes the traditional measures of releasing affixed pressure head and introduces the working principle of low and low gas pressure regulation and its application in hig buildings.

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