Kuhn Rikon DUROMATIC User Manual page 11

The printed protection cap in particular should only ever be
cleaned with a damp cloth (never use abrasive cleaners, bleach
or SWISS CLEANER).
Do not use any corrosive agents like Javel water for cleaning.
Remove obstinate calcium stains (white spots) with a few drops of
vinegar, lemon juice or SWISS CLEANER. (See section 16)
If the pan has become discoloured from overheating, then we
recommend the use of SWISS CLEANER.
If the lid is difficult to turn when closing, then apply a light film of cook-
ing oil to the rubber gasket.
When storing, place the inverted lid on the pan so that the rubber
gasket inside the lid remains unstressed and free of deformation.
10.1 Valves
10.1.1 Removing the protection cap
10.1.2 Maintenance and cleaning
To dismantle the INOX, CLASSIC, SUPREME, ERGO and HOTEL valves, undo
the valve screw with integral pressure indicator (6) on the lid inside using a coin
or screwdriver, and holding the valve cap. Hold onto the valve cap while doing so.
INOX, CLASSIC, SUPREME, ERGO AND HOTEL models
Remove all protection caps
using both hands.
1 Valve cap
2 Protection cap
3 Valve socket
4 Valve washer
5 Valve spring
6 Pressure indicator
7 Lock nut