BUCHI Rotavapo R-250 - Manual (Page 17)

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Rotavapor R-250 4 Putting into Operation
4.10 Operating the Shut-off tap
The shut-off tap is of a special design. It does not have a
con ti nuous thread on its inside for tightening it, but rather a
sli ding plane with two fixed latching positions. The closing
pres sure when it is in a closed position is provided by a
prestressed spring.
s
ching piece and turn the white lower section of the grip
ቢ clock wise until the tap is tightly seated.
s
Turn the black upper section of the grip
ባ clockwise
until the shut-off tap latches into the first position. If the
opening is not large enough, continue turning until the
tap reaches the second latching position.
4.11 Operating the Inlet Valve
The inlet valve is also closed by an integrated spring, which
applies contact pressure between the PTFE and the ground-
glass joint. The valve can be opened and closed by operating
the lever manually. The setting screw on the lever permits
precise continuous metering or venting.
Fig. 4.14: Shut-off tap
Fig. 4.15: Inlet tap
ቢ
ባ