26
6 Maintenance
BÜCHI
Vac
V-500/V-501/V-502/V-503
5. Now connect the connecting hose, tighten the hose con-
nections, and then assemble the second pump head the
same way as the first one.
6. If the vacuum is not achieved, it may be necessary to
replace or clean the valve head seals. To do this, remove
the valve heads as indicated in 6.2. 1-4.
Carefully take the white sealing rings out of the retainer using
the valve reed and place them in an ultrasonic bath (if possible).
Refit the cleaned individual parts or replacement parts as
shown in the diagram.
6.3
Function control
The function control should be done each year according this
instruction:
•
Cleaning (see Chapter 6.1 and 6.2)
•
Visual control of the device, connection cable, glass parts
and tube connection.
Deviations:
Suction time of a volume of 3 lt on end vacuum of 20 mbar is
longer than 60 seconds.
Valve head without valves
Insert the valves
Valve head with inserted valves
