Monday, April 15, 2013

Loranzato espresso machine - leaks & three way valve


On the leak front I've fabricated a better drain arrangement.
New drain arrangement with 90 elbow to avoid crimping drain line.
Hopefully this will resolve the water problem.

I took the 3 way valve off and disassembled it.  Here's what it looks like connected with a good shot of the color codes.
Color codes on 3 way valve.
With some difficulty I was able to remove the valve.  There is a good description of the valve here.  Since the valve was not working I decided to take it apart with a view that trying to repair it.  Here's the valve partially disassembled.

Three way valve removed and partially disassembled.
I disassembled the valve guide (base and nucleus).  Here's what I found.

Disassembled base and nucleus.
When I examined it closely I found that a spring was broken.  This spring holds the valve closed.

There's a good description of 3 way valves here.  Based on this the valve is a 3 way valve with a flange body 110v coil and ruby valve nucleus.

Karma Dave said he'd order one.

Issues:

  • Should I drain the boiler?  Shoud I descale? - DEFERRED
  • Parts - OPEN
    • Karma is ordering 
      • Steam wand
      • Group head O ring
      • 2 shot basket
      • 2 shot spout
      • back flush basket
  • Drips from three-way valve - need to replace valve
  • Pressure gauge - Seems OK.
  • Pressurestat - Seems OK

CURRENT PARTS LIST:

  • Steam wand - Looks like Espresso Parts has an after market wand at a reasonable price (>$40).  Karma will order.
  • Citric acid: I'm going to defer this for the moment.  
    • Amazon offers "Spicy World Citric Acid, 5-Pound"
    •  Are 1 or 2 tablespoons of citric acid per liter the correct concentration?
  • Portafilter - Espresso parts is a source or Dave may be able to help
    • Double basket
    • Double portafilter spout
    • Backflush disk
  • Group head gasket - Espresso Parts has part.  It is described as  RANCILIO GROUP HEAD PORTAFILTER GASKET - 74 X 57 X 8.2MM.  There is an aftermarket part as well described as "An economical alternative to the O.E.M. gasket. 73.5 x 57 x 8mm."
  • Three-way Lucifer - Parker Solenoid valve 110V 50/60Hz 9W Part number 491514P3 D400P3.

CURRENT TODO LIST:

  • Buy/acquire needed parts
  • Replace three way valve
  • Flush machine to resolve taste
  • Sort out drain hose issue.
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