二级减压阀
- 网络Two stage pressure reducing; high-purity dual-stage regulators
二级减压阀二级减压阀
Two stage pressure reducing
供应天... ... 一级减压阀（ One-level pressure reducing） 二级减压阀（ Two stage pressure reducing） 标准配置 Standardfeat…
high-purity dual-stage regulators
...ired.4、用纯度有保证的气体5、用质量有保证的二级减压阀（ high-purity dual-stage regulators）6、气瓶没有装减压阀时不 …