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.: 999019 / 22/12/2009
page 24 of 29
Individual performance check of a pump head:
➃
➃
➃
➃
➃
➀
➀
➀
➀
➀
➁
➁
➁
➁
➁
➂
➂
➂
➂
➂
Assembling pump heads:
➨
Use
face wrench with torque indicator
(recommended:
face
wrench with torque indicator from VACUUBRAND, Cat.-
No.: 63 75 80
) to assemble diaphragm clamping disc, dia-
phragm and diaphragm support disc (and eventually wash-
ers) to the connecting rod.
☞
Make sure that the square head screw of the diaphragm
clamping disc is correctly seated in the guide hole of the
diaphragm support disc.
Optimum torque for the diaphragm support disc:
6 Nm.
☞
The optimum torque is achieved if the pointer in the handle
of the VACUUBRAND face wrench shows to the longer mark-
ing line.
➨
By turning eccentric bushing (front of connecting rod), bring
connecting rod into a position in which diaphragm is in con-
tact with housing and centred with respect to bore.
Reassemble in reverse order.
➨
Install head cover (with O-ring if applicable), valves and hous-
ing 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.
➨
By turning eccentric bushing, bring connecting rod into up-
per turning point position (Max. stroke of the rod).
☞
Pay attention that the diaphragm stays positioned centrally
so that it will become clamped uniformly between housing
and head cover.
By measuring the pressure at the inlet port of the individual
head:
➨
Use a suitable vacuum gauge (e. g. DVR 2, cat. no.: 68 29
02), 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 diaphragms are correctly seated
(diaphragms concentric with bore).
➨
Screw in four socket head screws fixing housing cover cross-
wise (e. g. in the sequence
➀
,
➁
,
➂
,
➃
) first slightly, then
tighten.
☞
Do not tighten until head cover is in contact with housing,
torque
12 Nm
.
