I thinkt that this was a legacy name associated with IMO pumps. We have a number of IMO screw pumps in asphalt service. Some of the older ones have the name IMO DeLaval included on the original manuals. The current company is IMO Industries Inc. of Monroe, NC.
Wow - memories... My Dad spent 47 years with Delaval. He held multiple engineering and management positions with the Turbine division in Trenton, then opened the Monroe NC and Columbia KY plants were he was VP/General Manager. I spent 3.5 years as an Engineer with Delaval - so combined, we hit the 50 year mark.
I currently work for IMO and the see a few of the old DeLaval nameplates come back in house. They are a reliable workhorse when used by competent customers.