Green gas is released through a rather large valve into two helicoil tubes.
绿色气体通过一个相当大的阀门释放到两个螺旋油管中。
2
Cut the tubes to a proper length and place them in the cut-off valve.
切开管对适当的长度并且安置他们在停汽阀。
3
In this system, many transparent tubes filled with liquid are used for background, and there is a solenoid valve at the bottom of each tube, which can produce bubbles in the tube.