3.3 Cleaning, manual
3.3.1 Cleaning valves
WARNING!
Possible sparking
Once the large single-hinge clamps have been opened,
parts can fall out of the discharge and suction valve and
cause sparking.
–
Only open the large single-hinge clamps away from
an explosive atmosphere and take care of the parts.
CAUTION!
Parts can fall out of the valves - especially the discharge
valve - and become damaged, making them unsuitable
for hygienic use.
–
Carefully open the large single-hinge clamps and
take care of the parts.
NOTICE!
–
Only tighten the single-hinge clamps by hand. Do
not use any tools or extension!
B1285_3
5
4
3
2
1
6
7
Fig. 14: Cross-section through the Sigma Hygiene liquid end
1
O-ring
2
Connector section
3
Valve housing
4
Ball
5
Valve seat
6
Dosing head
7
Diaphragm
n
Risk of confusion: Once assembled, the balls (4) and their valve seats
(5) must be seated at the bottom of their valve housing (3) - refer to
Further information on page 23
.
n
Preferably clean the valves individually so that the same ball is
replaced in the same valve seat.
Notes on cleaning metering pumps with hygienic pump head
23
