阀芯的英文：
needle ;valve disc ;valve plug ;valve spool

needle是什么意思：
n. 针；指针；针状物；刺激
v. 刺激，激怒；用针缝，刺；缝纫

The needle stuck in my finger.
针扎进我的手指了。

To look for a needle in a Bundle of hay
海底捞针

Searching for a needle in a haystack
大海捞针

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。

disc是什么意思：
n. 圆盘；磁盘；唱片

herniation of intervertebral disc
椎间盘突出

nucleus pulposus of cervical disc
颈椎间盘髓核摘除术;颈椎间盘髓核摘除术

Have you recorded the data in disc?
你已把那些数据存储到磁盘上了吗？