一级减压阀， 二级减压阀 的英文翻译怎么翻

Question

太专业化了，我不懂，

Answer 1

primary pressure reducing valve 一级减压阀
secondary pressure reducing valve 二级减压阀本回答被提问者采纳

Answer 2

一级减压阀:reducing valve level-1
二级减压阀:reducing valve level-2

Answer 3

primary relief valve
secondary relief valve

Answer 4

first level relief valve
second level relief valve

Answer 5

A valve, two valves