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11.1
Cleaning double ball valves
Cleaning a discharge valve
1
2
3
4
*
5
*
6
7
Fig. 33: Discharge valve (double ball
valve).
Cleaning a suction valve
Taking the discharge valve apart
1.
Unscrew the discharge valve from the dosing head and rinse out.
2.
Dismantle the discharge valve.
3.
Rinse and clean all parts.
4.
Replace the worn parts and seals.
Assembling the discharge valve
When assembling, take note of the orientation of the valve
seats (3). The valve seats (3) are used as a ball seat on the
fine machined side and as a ball cage and spring guide on
the other side. The fine machined side must point in the flow
direction with all valve seats.
When assembling the valves, take note of the sequence:
Teflon – Metal – Teflon – Metal - ...
1.
Slide into the valve body (1) one after another:
one seal (2) and one valve seat (3) - correct!
n
one seal (2) and one valve bushing (4)
n
(If fitted: one spring (*) into the spring guide of the valve seat (3)
n
one ball (5) into the valve body (1)
n
one seal (2) and the second valve seat (3, correct!)
n
one seal (2) and the second valve bushing (4)
n
(If fitted: the second spring (*) into the spring guide of the valve
n
seat (3))
the second ball (5) into the valve body (1)
n
one seal (2), the third valve seat (3) - (correct!) and a further
n
seal (2)
2.
Position the insert disc (6) with the flare on the packing.
The distance between the edge of the valve body and
the insert disk (6) is due to the construction.
3.
Place the larger seal (7) between the insert disk (6) and the dosing
head.
4.
Screw in the valve until the stop.
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).
Repairs
45
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