Rancilio Silvia ExpansionOver Pressure Valve Adjustment

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This video shows you how to adjust the Expansion/Over Pressure Valve (O.P.V.) to adjust the pressure coming out of the group head of your machine in order to extract the perfect espresso! • The portafilter pressure gauge kit is part 1985 and is available online at: • http://www.espressotec.com/index.php/...

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