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MMD > Archives > April 1999 > 1999.04.02 > 07Prev  Next

Ampico B Pump Spill Valve Oscillation
By Craig Brougher

Dick,  I've found that oscillations happen when the bleed to the sleeve
spill pneumatic is missing or too large.

Look at your schematic.  Anything that will cause the sleeve pneumatic
to overshoot will also cause oscillation.  The bleed dampens the pump
pulses, and prevents the sleeve from overshooting with each pulse by
slowing it down.  That allows the sleeve to react slowly and out of
time with the pump, so it won't oscillate.

Craig Brougher

(Message sent Fri 2 Apr 1999, 16:47:41 GMT, from time zone GMT-0600.)

Key Words in Subject:  Ampico, B, Oscillation, Pump, Spill, Valve

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