14
6.3. Cleaning The Gas Ballast Valve
Gas ballast valve 2 can only get dirty if the ambient air sucked
in is dusty.
Assembling and dismantling the Standard Model
➡
Insert round steel bar into boring 59 and remove gas
ballast valve 2; take care with the O-ring.
➡
Remove sleeve 61.
➡
Remove insert 70 (see "Corrosive Gas Model"). Four bore
holes have been provided on the front side for this operati-
on.
➡
Clean all parts.
➡
Check O-ring 60 for wear and replace if necessary.
➡
Lightly oil O-rings with operating medium.
➡
Re-assemble the parts in reverse order.
Assembling and dismantling the Helium Tight and Corrosive
Gas Models
➡
Insert round steel bar into boring 59 and remove valve hou-
sing 68 taking care with the O-ring 71. Connecting piece 72
is not removed.
➡
Remove dosing valve unit 64 from 68.
➡
Remove safety ring 67 and dosing insert 66 from dosing
valve unit 64.
➡
Remove insert 70. Four borings have been provided on the
front side for this operation.
➡
Clean all parts.
➡
Check O-rings 65 and 69 for wear and replace if necessary.
➡
Lightly oil O-rings with operating medium.
➡
Re-assemble the parts in reverse order.
6.4. Shutting Down For Longer Periods
Should the pump have to be shut down for an longer period,
the complete pumping system must be adequately protected
against corrosion.
➡
Switch off pump.
➡
Unscrew operating fluid drain screw 43 and drain
operating fluid as per Section 6.1.
➡
Screw in operating fluid drain screw 43; keep an eye on
the position of the O-ring.
➡
Allow pump to run for about 10 seconds with open vacuum
flange. .
➡
Drain off remaining operating fluid.
➡
Fill up pump with fresh operating fluid:
Filling: UNO 120 A --> 21 l
DUO 120 A --> 18 l
If this amount of operating fluid is filled in, the level is
extremely high but this is necessary to protect all parts of the
pump against corrosion.
Before operating, the operating fluid must be
reduced to its normal level.
CAUTION
