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Assembling pump heads
(1)
Individual performance check of a pump head:
By measuring the pressure at the inlet port of the individual head:
Use a suitable vacuum gauge, make sure that it is correctly calibrated, and measure the pressure at the
inlet port. A vacuum of less than 110 mbar should be indicated.
☞ If the reading is higher, recheck the pump chamber and make sure that the valves and the dia-
phragms are correctly seated (diaphragms concentric with bore).
Replacing the valve at the distributor (outlet side of MD 12 / MV 10)
Documents are only to be used and distributed completely and unchanged. It is strictly the users' responsibility to check carefully
the validity of this document with respect to his product. Manual-no.: 9997832 / 03/02/2009
page 21 of 26
➨ Bring the diaphragm into a position in which it is in contact
with the housing and centred with respect to the bore.
Reassemble in reverse order.
➨ Install head cover with O-rings (only MD 8 / MD 12 / MV
10), valves and housing cover.
☞ Make sure that the valves are correctly seated: Valves
at the outlet (1) with round centred opening under valve,
valves at the inlet (2) with kidney-shaped opening beside
(2)
valve.
☞ Pay attention that the diaphragm stays positioned centrally
so that it will become clamped uniformly between housing
and head cover.
➨ Screw in four socket head screws fixing housing cover
crosswise first slightly, then tighten.
☞ Do not tighten until head cover is in contact with housing,
torque 12 Nm.
An additional valve is located underneath the cover plate.
➨ Use open-ended wrench (w/f 15) to loosen the union nut
of the hose which runs directly to the cover plate of the
distributor, at the pump head.
➨ Pull the bent connecting hose off the hose connector at the
pump head.
➨ Unscrew the two countersunk screws at the distributor us-
ing a Phillips screw driver.
➨ Remove the cover plate.
➨ Note the position of the valve and remove it.
☞ Check valve for damage and replace if necessary. Make
sure that the valve is correctly seated.
➨ Assemble the cover plate and fixate with both counter-
sunk screws.
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