Operation
18
GA 03.108/14.02 - 01/03
4.3 Shutdown and Storage
We recommend to keep the RUVAC WS
with a PFPE filling running even during pro-
longed intervals (e. g. over night) with the
intake line closed. This can help to avoid
corrosion during standstill.
Close the valve between the Roots pump and the vacu-
um system. First switch off the Roots
pump, then the backing pump.
After working with corrosive gases, the system should be
vented with dry protective gas (e.g. N
2
) to prevent corro-
sion during standstill.
When shutting down the pump and removing it from the
system, it is advisable to seal the connecting flanges
tightly.
Before removing pump from the vacuum
system, disconnect it from the mains supp-
ly.
Before removing the RUVAC WS PFPE from the system
it must be purged with nitrogen and sealed in a gas-tight
manner.
For transportation and storing of the pump, observe the
information provided in Section 2.
4.4 Changing from Vertical
to Horizontal Flow
The RUVAC WS/WSUs are supplied as standard for ver-
tical flow unless you specifically request horizontal flow.
Moreover, the pump may be converted from one flow
direction to the other.
For this proceed as follows:
Drain the lubricant (11/2) or (11/4) and tightly screw the
oil-drain plug back in. Remove the feet, turn the pump by
90° as shown in Fig. 5 (dimensional drawing) and mount
the feet for the new direction of flow.
The longitudinal axis of the pump must
remain horizontal so that no residual lubri-
cant can flow from the side chambers into
the pumping chamber.
Fill in lubricant (11/3); (see Section 3.2).
If a pressure switch has been installed, turn it so that it
again points vertically upwards.
The valve in the pressure balance line of the RUVAC
WSU is designed to work with both vertical and horizon-
tal flow of the pump.
Caution
Warning
Caution
Fig. 11 Changing the lubricant
Key to Fig. 11
1 Oil-level glass
2 Oil-drain plug for vertical flow
3 Oil-fill plug
4 Magnetic oil-drain plug for horizontal flow
1
2
3
4
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