Field Service Manual December 2003
Page 81 of 276
MF Relief valve system
Consists of 2 2” valves.
1 of them is adjusted so that there is 70mbar vacuum inside the drum.
1 of them has to be adjusted for high vacuum level (about 220 mbar vacuum inside
drum)
System:
While loading a film a low vacuum is needed of 70 mbar.
Ones the film is around the drum the valves are closed by means of the 1 vacuum
command. Pressure (1bar) is put on the relief valve( by means of the pressure
regulator) what makes them close. At that moment the second relief valve takes over
and holds the vacuum on about 220 mbar.
In a single relief valve system you only have to adjust the high vacuum setting.
Adjusting VACUUM by using the Relief Valve:
When opening-loosening the top part of the relief valve the spring can be seen for
adjusting the drum vacuum. Adjusting the screw more to the bottom the vacuum will
increase. Bringing the adjustmentscrew more to the top the vacuum will decrease.
Don’t forget to close the valve again !!
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