[TR] Purolater Oil Control Head

[Jerry Van Vlack]

List, there are 2 ball and spring assemblies contained in the TR4 Purolator Oil Control Head. I understand the function of the adjustable assembly. I don’t understand the function of the non-adjustable ball and spring assembly. What function does it serve? Might it be a relief valve for an over pressure within the filter and if so does it somehow result in limiting full flow thru the filter? 
I seem to recall reading about how the control head works a number of years ago but can’t find that article now.
Thanks,
JVV
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