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16.3.3 REPLACING VALVE PLATE AND SEALING
1. Remove the pressure plate (Figure 11/4) from the pump head using the six screws (Figure 11/5).
2. Loosen the screw (Figure 11/7) and remove it together with the washer (Figure 11/8).
3. Separate the head cover (Figure 11/3) from the intermediate plate (Figure 11/2).
Note
Carefully lay down the head cover so that its sealing edge is not dam-
aged.
4. Remove the valve plates/sealings (Figure 11/9) from the intermediate plate (Figure 11/2).
5. Remove the O-ring (Figure 11/10) from the intermediate plate.
6. Check valve seats, intermediate plate (Figure 11/2), head cover (Figure 11/3) and, if neces-
sary, O-ring groove for contamination and damage. Clean parts if necessary. Contact M&C if
uneven, scratched, or corroded. Order and replace damaged parts.
7. Insert valve plate/sealing.
Note
Valve plates/sealings for discharge and suction side are identical; top
and bottom of valve plates/seals are identical.
8. Insert new valve plates/sealings (Figure 11/9) into the valve seats of the intermediate plate
(Figure 10/2).
9. Ensure that the valve plates/sealings (Figure 11/9) are centered in the valve seats of the inter-
mediate plate (Figure 11/2) by moving the valve plates/sealings (Figure 11/9) slightly horizon-
tally.
10. Install the new O-ring (Figure 11/10).
11. Place the head cover (Figure 11/3) on the intermediate plate (Figure 11/2) according to the
dowel pin (Figure 11/12) and the felt-tip mark.
12. Check the centering of the head cover (Figure 11/3) by moving it slightly sideways.
13. Connect the head cover (Figure 11/3) and the intermediate plate (Figure 11/2) by tightening the
screw (Figure 11/7) with the washer (Figure 11/8) underneath (tightening torque: 100 Ncm).
14. Place the pressure plate (Figure 11/4) with the six screws (Figure 11/5) on the head cover
(Figure 11/3) and the intermediate plate (Figure 11/2) according to the felt-tip markings.
15. Dispose of the replaced diaphragm, valve plates/seals and, if necessary, O-ring properly.
