Wega 1GR Series, Use And Maintenance Manual

Page: 12 / 68

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of
68
TECHNICIANS manual
2.6.7 LEVER groups
Lever groups us the boiler pressure and water. This
system does not require heat exchangers.
When the lever (
1
) is lowered, the spring (
2
) inside
the group is compressed: the piston (
3
) raises, allowing
water to enter the pre-infusion jacket.
When the lever is released, the piston compresses the
water to 8-10 bar, allowing dispensing of espresso coffee.
The non-return ball valve (
4
) keeps water from flowing
back into the boiler (
5
).
1
4 5
2
3
PHASE 1
Lowering the
lever
PHASE 2
Pre-infusion for
3-5 seconds
PHASE 3
Release of lever
and dispensing of
the coffee
2.6.8 TOGGLE groups
For the toggle group is used a system similar to the
one shown for the Dispensing Group see par. "2.6.9
DISPENSING group" on page 13.
In this case the dispensing is controlled by a spring
system. The opening and closing of the valve for the
water flow is done by pressing a lever on the side of the
group that, in turn, moves a camme within the group,
allowing or not allowing the passage of water: