Not a dairy nor ex dairy man but I do know a little about vacuum pumps. The oiler is designed to lube the bearings of the pump and, depending on the material, probably to lube the vanes to reduce friction/heat and help them seal also. As for the diaphram it looks like it"s designed to cut off the flow of oil when the pump isn"t in operation. Depending on whether it"s on the suction or discharge side of the pump as to whether it"s working off of pressure or vacuum. Either way it senses the pressure/vacuum that occurs when the unit is in operation and opens allowing the oil to flow from the container into the bearings. Given the setup the oil will gravity feed, hense the need for the diaphram valve, but in operation there is probably a slight vacuum at work also helping draw it into the bearings. As for the optimal flow rate your guess is as good as mine. If the container is the origional size OEM"s typically sized them to run either a half (fil at lunch break) or a full day (fill at the end of the shift) before it needed a refill. That said I"d venture a guess that a few (4 to 6) drops a minute would be sufficent as as long at it"s turning less than 1000RPM, but if over that I"d increase the flow to say 8 to 10 drops per minute to allow for the increased heat load on the bearings from the higher speed.
Like I said I"m just guessing on the oil flow rate but you might do a little online research and call a few OEM"s and ask and get a general consensus of what they suggest.
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