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MMD > Archives > February 2008 > 2008.02.08 > 06Prev  Next


Measuring Valve Seat Leakage
By Spencer Chase

I don't think you can get a realistic measure of valve seat leakage by
applying pressure from the top.  A valve will seat better with vacuum
from the bottom.  Pressure from the top will tend to unseat the valve
whereas suction will help it to seat.

Under-suction is the normal operating situation; so this is how leakage
should be measured.  I measure flow through an open valve with pressure
from the top.  But I measure leakage with vacuum from the bottom.  To
measure a single valve's leakage, you have to isolate it, which can be
difficult.  You may have to make a suitable fixture to apply suction to
the bottom of the seat.

Spencer Chase


(Message sent Fri 8 Feb 2008, 04:29:50 GMT, from time zone GMT-0800.)

Key Words in Subject:  Leakage, Measuring, Seat, Valve

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