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Question

What is the difference between a "semi-automatic" drain and an "automatic" drain.

Answer

The semi-automatic drain empties when pressure is relieved from the system (at night during shutdown, for example). A small spring seal is pushed down by pressure, and is released when the pressure falls to near zero.

An automatic drain has a float, that will drain when the liquid level rises enough to trip it.


FAQ Subcategory: None

This item was last updated on 2015-02-16
Document ID: 1530


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