Calibrate Expansion Valve - V3
Calibrating Expansion Valve - Espresso V3
(This guide also applies to the Espresso V1 & 2)
SLAYER 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:
- 1/2" fitted wrench
- Microfiber towel
- Blank portafilter
Parts:
- 46000-50110 Expansion Valve
- 46000-50150 Gasket, 1/4", Copper
Step 1:
- Insert blank portafilter into group.
- Actuate to Full-Brew position.
- Adjust pump pressure to 11~12 bars.
Step 2:
- Locate expansion valve on left side of pre-heat tank.
- Place a microfiber towel underneath valve to catch water drops.
Step 3:
- With maximum intervals of 20 seconds, actuate the group to Full-Brew with a blank portafilter engaged.
- 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 4:
- 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 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:
- Squeaking sounds during or towards the end of an extraction.
- Low or unstable brew group temperature.
- Leaking.
- Poor water quality.
Expansion valves are most often recommended to be replaced or adjusted as a resolution measure.