core pin plate
... core picker 落井岩心打捞工具 core pin plate 穿孔杆板 core pin 穿孔杆；芯杆；销钉 ...
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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。
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 .
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