- Help Center
- ECM Mechanika V Slim
- General Maintenance
-
Getting Started
-
Espresso 101
-
Warranty, Ordering & Returns
-
Bezzera BZ10
-
Bezzera Duo DE
-
Bezzera Duo MN
-
LUCCA A53 (Direct Plumb & Mini) by La Spaziale
-
LUCCA M58 by Quick Mill
-
LUCCA S58 by Profitec
-
LUCCA X58 by Quick Mill
-
La Marzocco Linea Mini
-
La Marzocco GS3
-
Lelit Bianca
-
Lelit Elizabeth
-
Lelit Victoria
-
ECM Synchronika
-
ECM Special Edition Classika PID
-
ECM Mechanika V Slim
-
ECM Casa V
-
ECM Puristika
-
Profitec Pro 300
-
Profitec Pro 400
-
Profitec Pro 500
-
Profitec Pro 600
-
Profitec Pro 700
-
Profitec Pro 800
-
Rocket Appartamento
-
Rocket R58 / Cinquantotto
-
Rocket Giotto
-
Rocket R Nine One
-
La Spaziale S2 EK
-
Rancilio Silvia
-
Rancilio Silvia Pro
-
Rancilio Silvia Pro X
-
Izzo Alex Duetto
-
Quick Mill
-
Breville Oracle
-
Dalla Corte Mina
-
Slayer
-
Lucca Grinders
-
Baratza Grinders
-
LUCCA Atom 75
-
Eureka Grinders
-
ECM Grinders
-
Compak Grinders
-
Fellow ODE Grinder
-
Mahlkonig Grinders
-
Profitec Grinders
-
Breville Grinders
-
Dalla Corte Grinders
-
Macap Grinders
-
Fiorenzato Grinders
-
General Troubleshooting
-
Like New & Trade-In Program
-
Eureka Mignon Libra
-
Eureka Mignon Libra User Manual
-
Rocket Boxer Setup Guide
-
Rocket Boxer Timer User Manual
-
Baratza Encore ESP Setup Guide
-
Baratza Encore ESP User Manual
-
Fellow Opus User Manual
-
Fellow Opus Setup Guide
ECM Mechanika V Slim: Expansion Valve Adjustment
On vibratory pump equipped machines, like the Mechanika V Slim, pressure at the group head is regulated by the expansion valve. Follow these instructions to set the pressure on your espresso machine.
Tools Needed:- Portafilter with back flush disc installed
- Flat-bladed screwdriver
The basics:
- Start with the machine fully heated.
- Turning the adjustment cap in (clockwise) raises the pressure at the group head.
- Backing the adjustment cap out (counter-clockwise) lowers the pressure at the group head.
1. Remove the cup warming tray from the top of the machine and identify the expansion valve adjustment cap.

2. Install the back flush disc into your portafilter and lock it into the group head — lift the brew lever to run the pump while observing the pump pressure gauge.
3. The pressure should rise smoothly and stabilize within ~10 seconds. Take note of the final pressure reading before lowering the brew lever to shut the pump off. If the final pressure reading was above 10 Bar, you'll need to adjust the pressure lower. If the final pressure reading is below 9 Bar, you'll need to adjust the pressure higher.
4. Use the flat-bladed screw driver to turn the adjustment cap in the appropriate direction. Make adjustments in 1/4 turn increments or less; repeat steps 2-3 to check the pressure reading at the gauge between each adjustment.
5. Aim to adjust the expansion valve such that the pump pressure gauge reads between 9 and 10 Bar when checked with the back flush disc. (9.8 Bar is considered the industry standard.)
6. Take a moment to review our article about understanding your brew pressure gauge.