CHECK VALVE (~8psi) PRESSURE DROP TEST
(Video recorded on the 5th September 2007 at ERL) file size= ~4MB
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It appeared the checkvalve has imposed a 8psi offset to the entire pressure range.
The offset seemed to be linear to pressure increase, (look at the floating bulb on the far right)
No sudden CRACKING seemed to be present.The pressure differentail seemed to stay pretty constant with flow change.