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E61 OPV Pressure Setting

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  • E61 OPV Pressure Setting

    Hi All,

    Would like some expert opinion or input from your experience.

    What is the recommended OPV reading or setup for E61 grouphead machines with a double boiler & rotary pump configuration ?

    Should it be 8,9 or 10 at maximum on the pressure gauge during extraction?

    I also did read somewhere that pressure at e.g. 10 bar at the gauge translates to approx 9 bar at the OPV - grouphead ?

    Is that right?

    Thanks for your reply,
    Cheers

  • #2
    E61 OPV Pressure Setting

    Well, 9 bar is standard but we run espresso at different pressures for different roasts and grind particle size.

    Your machine (if it's a lever actuator) can pre-infuse the puck and then deliver water at full pressure (9 bar) or lower pressure, say, 6.5 bar (if you choose to set the OPV/bypass that loose).

    Gauges, unless newer, can be unreliable; best measure pressure with a portafiltre gauge at the group head.

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    • #3
      Originally posted by sprezzatura View Post
      Well, 9 bar is standard but we run espresso at different pressures for different roasts and grind particle size.

      Your machine (if it's a lever actuator) can pre-infuse the puck and then deliver water at full pressure (9 bar) or lower pressure, say, 6.5 bar (if you choose to set the OPV/bypass that loose).

      Gauges, unless newer, can be unreliable; best measure pressure with a portafiltre gauge at the group head.
      how do you ensure a portafilter gauge (unless its SCACE) is more accurate than the built in gauge . I mean they are usually of the similar quality.

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      • #4
        Originally posted by symphonie View Post
        how do you ensure a portafilter gauge (unless its SCACE) is more accurate than the built in gauge . I mean they are usually of the similar quality.
        I replace my p/f gauges every 2-3 months as running espresso tainted water and fines with its associated oils damages the gauge at the group head - so does the hot water. I have three different gauges including a German oil-filled precision gauge. Some machines have better quality gauges than others. I'm using a 20 bar oil filled gauge at the moment and it's very accurate.

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