Assembling the pump heads – VACUUBRAND PC 3012 VARIO User Manual
Page 67
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.: 999164 / 19/05/2009
Assembling the pump heads
➨
Bring connecting rod into a position in which the diaphragm
is in contact with the housing and centred with respect to
the bore.
Reassemble in reverse order.
➨
Install head cover with O-rings, valves and housing cover
with housing cover insert.
☞
Make sure that the valves are correctly seated: Valves at
the outlet with round centred opening under valve, valves
at the inlet with kidney-shaped opening beside 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 the housing cover
crosswise first slightly, then tighten.
☞
Do not tighten until head cover is in contact with housing,
torque 12 Nm.
By measuring the pressure at the inlet port of the individual head:
Use a suitable vacuum gauge (e. g. DVR 2, cat. no.: 682902), make sure that it is correctly calibrated,
and measure the pressure at the inlet port. A vacuum of less than 120 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).
Individual performance check of a pump head:
Replace diaphragms and valves of the opposite side of the pump in the same
way!