36
© Lutz-Jesco GmbH 2020
BA-10491-02-V01
Piston diaphragm dosing pump
MEMDOS KMS LB/LA
Operating instructions
12.5 Changing the ball valves
Inspect the valve ball and valve seats and replace the O-rings at the same
time as the hose diaphragm.
41866_1
Bild BA Kugelventil 1" 1.4401/CSM
12.5 Kugelventile austauschen
1
4
2
3
4
Fig. 20: Changing the ball valves
Perform the following working steps:
1.
To dismantle the valve into its constituent parts, press against the
ball guide (1) with a blunt rod and press it out of the valve together
with the valve seat (2) and the valve ball (3).
4
No unevenness may be visible on the surface of the valve seat.
Replace the valve seat given any unevenness.
i
If the surface of the valve seat has been damaged by erosion
or corrosion, the valve seat can be turned to provide a new
sealing surface.
2.
Replace both O-rings (4) of the valve.
3.
Return the valve between the “ear” of the dosing head and the dosing
head connections. The arrows on the valves must point upwards.
4.
Position the valves in the centre and retighten the valve bolts.
5.
If no further maintenance work is required on the pump, fill the pump
to the mark with oil before starting it.
ü
Ball valves changed.
12.6 Changing the poppet valves
Inspect the valve components and replace the O-rings at the same time
as the hose diaphragm.
42026_1
Bild BA Saug/Druckventil DN30 federbelastet
12.6 Tellerventile austauschen
2
2
3
1
Fig. 21: Poppet valve
Perform the following working steps:
1.
To dismantle the valve, press carefully on the plate (1) without de-
forming it.
2.
Inspect the individual components for erosion and corrosion. Also
check the spring (3).
3.
Replace worn or corroded components.
4.
Replace both O-rings (2) of the valve.
5.
Return the valve between the “ear” of the dosing head and the dosing
head connections. The arrows on the valves must point upwards.
6.
Position the valves in the centre and retighten the valve bolts.
7.
If no further maintenance work is required on the pump, refill the
pump with oil before starting it.
ü
Poppet valves replaced.
