背压阀,反平衡阀

counterbalance valve的用法和样例：

例句

We strongly recommend installing a safety relief valve in addition to the unloader to add more protection from dead-heading.我们强烈建议，除了减压器外，再安装安全卸压阀来防止跑空。
Follow manufacturers instruction regarding the installation and adjustment of any unloader and safety relief valve you choose.按照操作守则关于你所选择的减压器和安全卸压阀的安装和调节指示。

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accretionary structure

addressable horizonal position