Operating Principle: The diaphragm valve is a handwheel-operated valve, utilizing a two-piece stem separated by non perforated diaphragms. These diaphragms prevent leakage along the valve stem .
运转原理：膜板阀是一种手轮型阀门，它采用两个由非穿孔横膈膜隔开的阀杆。这些横膈膜防止了沿着阀杆的泄漏。
A micromachined condenser microphone with a free floating sensing diaphragm and a perforated thick copper backplate is presented.
提出了一种具有自由悬浮敏感膜和带孔铜底板的硅微机械电容式麦克风。
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