back valve

基本解釋

Casing back pressure valve plays a important role in well cementing operation as a casing accessories.
套管回壓閥作為一種簡便的套管附件，在固井施工作業(yè)中起著重要作用。
According to flow in a different, balanced spool valve the pressure can be pre-pressure, can also be a back pressure valve .
根據(jù)流向不同，平衡閥芯所受的壓力可以是閥前壓力，也可以是閥后壓力。
The performance and structure of existing back valve are introduced, and an ultra-low pressure startup back valve, which can be fixed freely in any pipes with any directions, is designed.
對(duì)現(xiàn)有止回閥的性能、結(jié)構(gòu)進(jìn)行了分析，設(shè)計(jì)了一種可以隨意安裝于各種方向的管道中的超低壓力啟動(dòng)上回閥。

We've yet to hear back from Valve for clarification.
ENGADGET: Valve's Gabe Newell confirms work on new game engine, still won't answer your Half-Life 3 queries
Even if the Steambox initiative fizzles, there's always the massive ongoing success of Steam's digital storefront to fall back on. 2013 may be the year that Valve attacks, but it's not just the company's internal hardware projects that are up for the challenge.
ENGADGET: 2013: The year that Valve attacks HD
The goal is to tighten up or otherwise improve the faulty valve, called the esophageal sphincter, that lets acid reflux back into the esophagus.
FORBES: Health