Small corner inthepipeline or permitted under conditions of constant use of natural elbow.
在管道线路转角较小或条件容许的情况下常采用自然弯管法。
2
This air valve is automatic device, it can exhaust air inthepipeline to reduce energy loss of system.
本阀属于自动阀类,能自动排除管路内的气体,减少管路系统的能量损失。
3
Next to it a boy leaned against the railings, his rod and line dangling out over the floating garbage and the stream of brown, stinking waste which trickled from a pipein the wall below.