General Maintenance

LUCCA A53 / Vivaldi: Expansion Valve Adjustment and Replacement

Below you will find step by step instructions on adjusting the expansion valve or replacing the expansion valve seat on your LUCCA A53 or La Spaziale Vivaldi espresso machine if it is worn out.

You will need the machine to be off, cooled down and have the water line shut off.

Tools Needed:

  • Phillips screwdriver
  • 21mm wrench or adjustable wrench

1. Turn off the water line, turn the machine off and let it fully cool. This step is only necessary if replacing the expansion valve seat. Adjusting it requires the machine to remain on.

2. Remove the front panel of the machine by removing the 2 screws in the front and pulling it out from the bottom. It will be easier to remove if you take out the drip tray.

3. Adjust the expansion valve by turning it the way shown in the picture. Left will loosen it, right will tighten it. If you find your expansion valve to be leaking, it may just need to be tightened a half turn or so. You will know the expansion valve is adequately adjusted if it stops leaking during a backflushing cycle.

4. If you need to replace the expansion valve seat, fully loosen it all the way until it pops out. Replace the fitting at the end of the spring and tighten the expansion valve back in place until the expansion valve does not leak during a backflushing cycle.