To experimentally investigate it, needle valves and transparent glass tubes with flow channels similar to that of safety valves were used instead of the safety valve.
采用针阀代替安全阀，实验研究了安全阀进口干度、阀开度对安全阀及下游管路中流动堵塞的影响。
2
All tubes, tube adjuncts and valves were made of glass and F4.