upstream line

基本解釋

Open the valve on the vent line just upstream the trip valve.
打開速閉閥上游放空管線上的閥門。
This digitalized optical fiber transmission system is upstream line of the bi-directional optical fiber transmission system.
數(shù)字化光纖傳輸系統(tǒng)，為有線制導(dǎo)光纖傳輸系統(tǒng)的一個部分；
Butterfly or similar type valves should be installed in the line upstream and downstream of the automatic control valve to allow for maintenance service.
在自動控制閥的上游和下游應(yīng)該安裝蝶閥或類似的閥門，以便于進(jìn)行維護(hù)維修。