subsea annulus valve 水下环形阀
annulus wing valve 环空翼阀
valve annulus 瓣膜环
annulus master valve 环形主阀
annulus mitral valve 二尖瓣环
Plication annulus heart valve 心脏瓣膜环折术
annulus s valve 环形阀
annulus safety valve 环形安全阀
A valve installed in the wellhead assembly to provide access to the casing annulus of non-producing casings.
安装在井口装置中的一个阀。它提供通向非生产套管的套管环形空间的通路。
PCTH tested valve has the function of being open state constantly and that keeping on open after annulus pressure relived out makes it much handy and be liable to be used.
PCTH测试阀可实现持开的功能，环空泄压后仍能保持开启状态，使用起来更加方便、灵活。
Conclusion: It is difficult to place prosthetic valve in routine sequence of valve replacement in patients with small aotic annulus and perivalvular leakage and hemorrhage of aotic incision may occur.
结论：小主动脉瓣环者，如果按照常规瓣膜替换顺序，将带来瓣膜座环困难、瓣周漏、主动脉切口出血等并发症。
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