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londonrain
09-30-2007, 10:54 AM
Replace two thumping SRV valves this week on the same job. The PGV tops fit the SRV valve body so it is an easy fix...After thinking about the problem I believe it is the solenoid not opening all the way.

Pulled out my calipers and measured the solenoid hole on both valve tops. The SRV is 2/100th" smaller than the PGV... Same measurements on a few different valve tops, all the same.

FIMCO-MEISTER
09-30-2007, 11:00 AM
Interesting. Is the thumping starting at shut down?

londonrain
09-30-2007, 11:04 AM
Interesting. Is the thumping starting at shut down?
One was at start up and the other was at shut down....

Mike Leary
09-30-2007, 07:03 PM
One was at start up and the other was at shut down....

I've had "thumping" too..always traced to high pressure.

londonrain
09-30-2007, 08:41 PM
Both valves use the same solenoid, diaphragm and diaphragm ring.....

Wet_Boots
09-30-2007, 08:50 PM
Opening thumping is kind of maddening. Almost like some oscillation or resonance is going on.

PurpHaze
10-01-2007, 09:15 AM
I run into "closing thumping" on rare occasions after installing a new valve. After it's been actuated a couple of times and the Flow Control is set where I want it... it goes away.