Calibrate Expansion Valve - V3

Calibrate Expansion Valve - V3


Calibrating Expansion Valve - Espresso V3
(This guide also applies to the Espresso V1 & 2)


AlertSLAYER recommends all service be performed by an experienced SLAYER Espresso trained technician. For a technician reference near you, please contact SLAYER Support at (206)-284-7171 (#1 in Directory) or email support@slayerespresso.com.

Objective:
Expansion valves should be replaced as part of Preventative Maintenance. The style on the V3 and Steam X require calibration after installation.

Tools:
  1. 1/2" fitted wrench
  2. Microfiber towel
  3. Blank portafilter  
Parts:
  1. 46000-50110 Expansion Valve
  2. 46000-50150 Gasket, 1/4", Copper

Step 1:
  1. Insert blank portafilter into group.
  2. Actuate to Full-Brew position. 
  3. Adjust pump pressure to 11~12 bars.
    1. Pump Adjustment - Universal

Step 2:
  1. Locate expansion valve on left side of pre-heat tank.
  2. Place a microfiber towel underneath valve to catch water drops.


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


Step 4:
  1. Once the spring pressure is set, adjust the pump back to 10 bar.
  2. The expansion valve should not leak at 10 bar.
  3. It should now only periodically drop when the brew circuit is heating to allow for thermal expansion.


Troubleshooting:
SLAYER recommends replacing expansion valves per SLAYER's Preventative Maintenance schedule. In the event an expansion valve begins to fail, several symptoms may be present:
  1. Squeaking sounds during or towards the end of an extraction. 
  2. Low or unstable brew group temperature.
  3. Leaking. 
  4. Poor water quality.
    1. SLAYER's Water Treatment Requirements
Expansion valves are most often recommended to be replaced or adjusted as a resolution measure.


Questions or concerns? Please contact: support@slayerespresso.com

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