复式缓解阀的英文：
duplex release valve

duplex是什么意思：
adj. 双重的，二倍的
n. 占两层楼的公寓套房；全双工

Would you like a duplex or a mobile home?
你想要双层楼公寓还是活动房屋？

Duplex controllers feature automatic alternation as standard.
豪华型控制装置的标准配置还包括自动变换器。

This duplex characteristic is the basis of its being widely applied.
这一双重奇异特性是它获得广泛应用的基础。

release是什么意思：
v. 松开，排出，免除
n. 放松，发布的新闻

release (of a pollutant)
排出污染物; 放出污染物

release of nationality
国籍解除; 放弃（脱离）国籍

memorandum of release
放弃索取换地权益备忘录

valve是什么意思：
n. 阀门；瓣膜；真空管
v. 装阀于；以活门调节

Valve Disadvantages: The valve is difficult to close and requires the operator to double close the valve.
阀门的缺点:阀门难以关闭，要求操作者二次关闭阀门。

pilot valve governor
带伺服电动机的调节器辅助调速器

The valve has jammed shut.
阀门给卡住了打不开。