Vacuum Breaker
The vacuum breaker is a mechanical valve located on the steam boiler.
As pressure builds in the boiler, steam pressure lifts a plunger, sealing
the boiler, allowing steam pressure to increase above atmospheric
pressure.
Expansion Valve
The expansion valve relieves front boiler pressure at 12 bar.
* The expansion valve is located in the drain box, which is
underneath the drip tray.
*It consists of a valve body, a valve seal and spring, which
are enclosed by an adjustable brass barrel.
*The expansion valve is adjusted by adding or relieving
tension on the spring by turning the adjusting barrel.
Safety Relief Valve
The pressure relief valve relieves boiler pressure at 1.8 bar
preventing the boiler from over-pressurizing. It is factory
adjusted and sealed and cannot be adjusted.
External Boost Pump
The boost pump increases existing water
pressure to 135 psi or 9 bar, which is
required to properly brew espresso.
* The pump pressure can be adjusted by
adjusting the screw on the side of
the pump.
* Rotating the screw clockwise will
increase pump pressure, while
rotating counter-clockwise will
decrease pump pressure.
*Ensure your waterline is stable, as
fluctuations in line pressure will
affect output pressure.
Relief Valve
Brass Washer
Washer
Body
Valve
Seal
Spring
Barrel
Outlet
Fitting
Check Valve
Inlet Fitting
Adjustment Screw
Pump
Motor
Clamp
Top Cap
Gasket
Teflon Cone
Body
Brass Washer