Setting Expansion Valve - Steam LP

Setting Expansion Valve - Steam LP


Calibrating Expansion Valve on Steam LP


Objective:
Expansion valves should be replaced as part of your preventative maintenance cycle. The style on the Steam LP is pre-set to 11bar, but can occasionally require adjustment.

Time:
15 minutes

Tools:
Small flathead screwdriver
Pliers
Microfiber towel
Blank portafilter  

Parts:
42000-50040 Expansion Valve

Procedure 
Read through instructions before carrying out procedure.

Step 1:
Insert blank portafilter into group. 

Step 2:
Activate the group. Adjust pump pressure to 11 bar using the bypass adjustment on the pump.

Step 3:
Locate expansion valve on the inlet manifold. Place your microfiber towel below for safety purposes in case of water leaks.


Step 4:
With maximum intervals of 20 seconds, actuate the group to full brew with a blank portafilter installed. 
Adjust the expansion valve until it releases one drop every 3 seconds. If it is not releasing water, turn counter-clockwise. If it is releasing too much water, turn clockwise.


Step 5:
Once the spring pressure is set, adjust the pump back to 10 bar. The expansion valve should not leak at 10 bar. It should now only leak when the brew boiler is heating to allow for thermal expansion.



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