A suction valve is dismantled, cleaned and assembled in the same way as
a discharge valve.
Please note, however, that when assembling, the valve seat
(3) must be aligned in the other direction. The fine machined
side must point in the flow direction with all valve seats (3).
10.2 Changing the piston
WARNING!
Observe the safety notes at the beginning of the chapter.
1.
Flush the suction line, discharge lines and liquid end (activate
flushing equipment or immerse suction lance in a suitable medium
and pump for a while (consider the effect of the medium on your
system first!)) or proceed, as described below.
2.
Stop the pump so that the lock nuts on the slide rod can both be
accessed using an open-ended spanner.
3.
Switch off the pump and secure it to prevent it being switched on
again.
4.
If the liquid end has not been flushed according to the above pro‐
cesses, then protect yourself against the feed chemical - protective
clothing, safety glasses, ... .
After dismantling immediately place parts that have been wetting
with the medium in a trough with a suitable medium for flushing, in
dangerous media were used flush and rinse thoroughly.
5.
Unscrew the hydraulic connectors on the discharge and suction
side.
6.
Take off the clear acrylic upper protective cover from the turret.
7.
Loosen the locking nuts on the slide rod and disconnect the piston
(2) from the slide rod.
8.
If fitted: Remove the leakage or flushing tubes from the tube nozzles
(6).
9.
Remove the turret flange retaining screws (3).
CAUTION!
The piston is breakable.
–
Secure the piston to prevent it falling out.
10.
Remove the liquid end and place onto a solid, even surface with the
labelled side facing down.
Fig. 16: Discharge valve (double ball
valve).
Cleaning a suction valve
Removing the liquid end
Repairs
32
Summary of Contents for Sigma / 2 Basic Type SBKa
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