7
4.5. Gas Ballast Valve (For Corrosive Gas
Processes)
Gas ballast valve 7 is equipped with a dosing unit 7.3 and a
flushing gas connection 7.4.
The dosing unit is closed when turned fully clockwise and
open when turned fully anti-clockwise. The amount of gas
can be set at any required rate from maximum to minimum
with a flow meter.
Gas ballast valve 7,
Standard version
Position: Closed
Position: Open
Please note:
Flushing gas must be connected when operating corrosive
gas model pumps. The gas ballast valve must be open.
Flushing gas pressure may not exceed 1.5 bar. The type of
flushing gas is dependent on the medium being pumped. Our
specialists would be pleased to give advice regarding the
type and volume of flushing gas required.
When working with synthetic pump fluid, the
manufacturer´s directions for use must be
observed. If F5 is heated to over 250°C,
poisonous gases damaging to the respiratory
system are produced. F5 must not be allowed to
come into contact with tobacco products. When handling
chemicals, the relevant manufacturer´s instructions must be
followed. Pump fluid which have been enriched with toxic or
corrosive substances must be specially handled and all perti-
nent regulations must be observed.
4.6. Silencer
Silencer 40 is a nozzle inside the pump housing and cannot be
altered; when dirty it should either be cleaned or replaced
(see Service Instructions).
7.1
7.2
7.4
Gas ballast valve 7, for Corrosive Gas Processes
1
Vacuum connection
2
Exhaust connection
3
Operating fluid filler screw
4
Operating fluid drain screw
5
Sight glass
6
Motor
7
Gas ballast valve
8
Support stand
9
Casing
44 Base plate
Working principle of High Vacuum Safety Valve 20
4.4. Gas Ballast Valve (Standard Version)
To avoid the condensation of vapours in the pump, air is peri-
odically fed into the working chamber at the beginning of the
compression phase via the gas ballast valve.
– Gas ballast valve 7 is shut when turning to the right to posi-
tion 0–0 and open when turning to the left to position 1–1.
Intermediate settings are not possible.
If the pumping process requires the connection of flushing
gas, an adapter connection G 1/8 can be provided for the gas
ballast valve (available on request).
21
23
26
Air
24
27
22
25
Oil
53
7.3
7.1 O-ring
7.2 O-ring
7.3 dosing unit
7.4 Flushing gas
connection
(for 9 mm hose)
To avoid condensation in the pump, vapours
should only be pumped off when the pump is
warm and with gas ballast valve open. Note
pump water vapour compatibility levels under
Section 8. Technical Data. When the process
has been completed, allow the pump to continue running for
about 30 minutes with open gas ballast valve for operating
fluid regeneration purposes.
