Omega 1151 Operating Instructions Manual page 37

3 Specific sections/general information
Helium escape valve
How to use the helium escape valve? (fig. 2)
In its normal position (fig. 2.1), the OMEGA helium escape valve is
perfectly watertight thanks to the gaskets (B), but it is not functional,
since it is screwed down.
fig. 2.1
fig. 2
During the decompression phase, unscrew the crown of the valve in
order to release the mechanism (fig. 2.2). The valve is now watertight
from the outside. As the interior pressure becomes greater than the
exterior pressure, it pushes the gasket (A) out of its seating, thus relea-
sing the gas (fig. 2.3). Once the pressure is equalised, gasket (A) returns
to its original position, pushed by the spring (C) (fig. 2.2).
This operation is automatically repeated several times during the
decompression phase. Once atmospheric pressure is reached, screw
down the crown of the valve (fig. 2.1).
Watch with a corrector incorporated in the helium valve:
to make a correction, the helium valve must be fully screwed in.
Note: even if the valve is unscrewed, and we strongly recommend
that the valve remains screwed down whenever the watch is immersed
in water, the watch is still water-resistant to a relative pressure of
5 Bar (50 metres). However, complete water-resistance to the dial
depth can only be achieved with gasket (B) and the valve in the
screwed down position.
Automatic helium escape valve: if your watch is equipped with
an automatic helium escape valve, no manipulation is required.
38
fig. 2.2
C
fig. 2.3
B
A