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Can't identify OPV-like valve on Bezzera BZ02S
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ryguy
Senior Member


Joined: 2 Aug 2009
Posts: 288
Location: Indiana
Expertise: I love coffee

Espresso: Bezzera BZ02S
Grinder: Pharos, B. Vario
Posted Sun Oct 28, 2012, 7:20pm
Subject: Can't identify OPV-like valve on Bezzera BZ02S
 

This is a question from an old thread that I don't think was ever answered. In the picture, there are 2 valves that look like OPVs with tubes going to the reservoir. When I run the pump with no portafilter attached, the tube coming from valve 2 sputters water back into the reservoir and valve 1 does nothing. When the pump has backpressure put on it, whether from a puck or a blind basket, valve 1 returns water into the reservoir at a much more consistent rate, while valve 2 does nothing.

Apparently valve 2 isn't an OPV since it only lets water through the tube at low pressure. But what is it?

I scoured Bezzera's manual, and valve 1 appears to be a suppression valve which I think is an OPV. There is a similar-looking valve described as a check valve in the specs for the direct connect model only, but I have the tank model, and I can't find anything that looks like the second "OPV" in my model's specs.

ryguy: bz02s_opv.jpg
(Click for larger image)

 
Ryan D
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