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Adjusting the OPV (over Pressure Valve) Gaggia Classic


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Measure from the top edge of the OPV (with the screw removed!) to the top of the adjustment screw with a vernier gauge (Use the depth gauge on the bottom of the vernier) Make this depth 11.5mm. Y

OPV Adjustment for the Gaggia Classic   1. You will need a pressure gauge that has been modified to fit the bottom of the standard domestic Gaggia portafilter. (fig a)     This assembly cost

AndyL, thank you for posting this guide and thank you to those of you who similarly maxed out the pressure gauge and posted about it - my own pressure gauge did exactly the same thing when I adjusted

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Thanks! And do you just attach this to the portafilter then turn the machne on for a second or two? Does the water just escape through the solanoid valve?

Also, is that link I sent up there not just the same as these two parts? (£6.99 and £3.49 respectively) Or is there more to it than that?

https://www.amazon.co.uk/Rongzou-Pressure-Gauge-40mm-15-300/dp/B085ZY9Y9Y/ref=sr_1_11?dchild=1&keywords=Pressure+Gauge+up+to+14+bar&qid=1599577440&sr=8-11

https://www.ebay.co.uk/itm/3-8-NPT-Male-to-1-8-NPT-Female-Straight-Adapter-Blue-/362145644310

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Remove the spout (can be tight) fit gauge firmly to P/F REMOVE BASKET lock into M/ch switch on, watch gauge until it steadies/ read your pressure.

NB It sometimes helps to fill the PF with water before attaching, this displaces any AIR in the gauge and prevents needle dancing about.

Turn off remove PF and gauge.    See other posts on how to adjust pressure. OPV

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@Bob Geldof 85Looked at similar purchase a couple of weeks ago and ended up buying two items from same seller on eBay which arrived very quickly

https://www.ebay.co.uk/itm/Pressure-Gauge-1-8-BSP-Bottom-Entry-50mm-dial-0-200-ps-2-Inch-/120873578223

https://www.ebay.co.uk/itm/3-8-Bsp-Female-1-8-Female-Socket-Reducing-Bush-1-off/110726500653?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

One small tip from a previous discussion is to use some PTFE tape on the threads. I didn’t and ended up with some water splashing inside the gauge, fortunately it dried out.

 

Edited by BBBean
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2 hours ago, BBBean said:

@Bob Geldof 85Looked at similar purchase a couple of weeks ago and ended up buying two items from same seller on eBay which arrived very quickly

https://www.ebay.co.uk/itm/Pressure-Gauge-1-8-BSP-Bottom-Entry-50mm-dial-0-200-ps-2-Inch-/120873578223

https://www.ebay.co.uk/itm/3-8-Bsp-Female-1-8-Female-Socket-Reducing-Bush-1-off/110726500653?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

One small tip from a previous discussion is to use some PTFE tape on the threads. I didn’t and ended up with some water splashing inside the gauge, fortunately it dried out.

 

Thanks for the tip! I'll buy those two parts then.

Where do you put the PTFE tape? On the join after you've put them together? Or on the thread of the pressure gauge before you screw the gauge to the socket?

Edited by Bob Geldof 85
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