Cylinders can be supplied with standard valves for gas withdrawal or with siphon tubes connected internally to the valves for liquid withdrawal. 钢瓶可以配有用于气体提取的标准阀门或在内部连接到阀门的用于液体提取的虹吸管。
A Research on Siphon-Forming Conditions for Siphon Tubes of a Filter 滤池虹吸管虹吸形成条件试验研究