Quote:
Originally Posted by HarryM1BYT
Looking at the above diagram - the second 'valve' doesn't seem to restrict or close anything, the disk simply moves into an open pocket in the pump.
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If you study the photos in Post 30, there is a valve seat machined into the inside of the pump case where the stat sits. I think the secondary valve seals the flow when the primary is fully open. That's why it it's floating on the small spring. There are pressure marks on the disc in Mike_Nocs photo.
TC