M&C TEC1 Series, Operation Manual

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15.1 Replacing the valve plates
Note
If you replace the valve plates, we also recommend to replace the O-
rings C at the same time.
For replacing the valve plates, the sample gas fitting .
To replace the valve plates, proceed as follows:
1. Unscrew the crankcase cover. To do this, loosen the 3
hexagon socket screws F (3 mm spanner).
2. Loosen the four hex socket screws G (3 mm spanner).
3. Remove pressure ring H.
4. Remove upper pump head A.
O-rings C and valve plates B are freely accessible now.
5. The valve plates and O-rings can now be cleaned or re-
placed.
6. Clean valve seats and pump head with an adequate sol-
vent (e.g. alcohol) and use oil-free compressed air to re-
move dust particles from the parts.
Figure 9 Sectional drawing MP-F..
After replacing or cleaning the valve plates and O-rings, follow these steps to re-assemble the pump:
1. Insert O-rings C into the grooves, and place valve plates B back into the cleaned valve seats. Make
sure that the valve plates are in the correct position.
Caution
Turn pump head A only to the right and up-
wards. This prevents the bellows from loosen-
ing from the connecting rod.
Note
On the pressure side, the smooth side of Valve B is facing downwards,
and on the suction side the smooth side of Valve B is facing upwards
(operating direction is marked with an arrow on the pump head).
G
H
D
E
A
C
B
F