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MMD > Archives > February 2009 > 2009.02.12 > 05Prev  Next

Adjustable Vacuum Source for Testing
By Spencer Chase

By whatever method you make a vacuum source -- foot pumped, box pump
or vacuum cleaner -- a simple adjustable port will not keep vacuum even
with varying demand.  To achieve this, you need some sort of reference
such as a spring or reference vacuum on a diaphragm regulator.

I like the diaphragm regulator because it is easy to build and adjust.
As long as the volume of the reference vacuum is kept small, a single
stage regulator is quite stable.  For absolute precision you need to
regulate the reference vacuum with a primary regulator, not just a
needle valve or reference orifice.

This all sounds very complicated but I have a little box that is about
4" by 1-1/2" by 1-1/2" that regulates vacuum from one inch of water
gage to 150 inches, reliably and easily.  I have not measured the flow
range for accurate regulation but it is more than would be needed for
just about any testing need you might encounter.

Best regards,
Spencer Chase

(Message sent Thu 12 Feb 2009, 13:54:24 GMT, from time zone GMT-0800.)

Key Words in Subject:  Adjustable, Source, Testing, Vacuum

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