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2
3
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6
7
Fig. 13:
Gas ballast valve with inert gas connection
1 Hose clamp
5
Inert gas hose
2 Hose connection with O-ring
6
Locking screw
3 Valve spindle
7
O-ring
4 Gas ballast valve
Required tools
● Allen key, WAF 2.5
● Open-end wrench, 14 mm WAF
● Calibrated torque wrench (tightening factor ≤ 2.5)
Behavior of process gases with condensable vapors
► Connect a supply line at the gas ballast valve.
– Connecting elements are included in the separate package
► Supply the vacuum pump with inert gas during operation via the gas ballast valve.
Fitting the hose connection
Observe the sequence during installation!
1. Disconnect the gas ballast valve from the rotary vane pump.
2. Fit the G 1/8" hose connection onto the valve body.
3. The hose connection must be fitted before screwing the valve body onto the rotary
vane pump again, in order to prevent shearing of the bolts.
1. Disconnect the gas ballast valve from the rotary vane pump.
2. Unscrew the locking screw on the gas ballast valve.
3. Screw in the hose connection on the gas ballast valve while at the same time ensuring correct
fitting of the O-ring.
– Tightening torque:
3 Nm
4. Fit the gas ballast valve again.
– Tightening torque:
1 Nm
5. At the same time, ensure correct fitting of the O-ring.
6. Connect the hose (DN 5 mm).
7. Fit the hose clamp.
8. Select the type and quantity of the inert gas used according to the process.
9. Consult Pfeiffer Vacuum if necessary.
Adjusting inert gas flow
The gas ballast quantity is regulated with the valve spindle.
1. Set the inert gas pressure to max.
1200 hPa (absolute)
.
2. Make sure that the inert gas pressure is greater than the respective intake pressure.
3. Set the desired gas quantity using the valve spindle.
– Clockwise rotation to the stop: Valve closed.
– Counter-clockwise rotation to the stop: Valve open.
Operation
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