Vogelsang VX Series, Manual

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Rotary lobe pump
Operating instructions
VX100Q, VX136Q..QD..QDM2, VX186Q..QD..QDM2, VX230Q..QD
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HiFlo plus
HiFlo plus- rotary lobes, in contrast to HiFlo rotary lobes, have a second groove. The groove, which in the
“arrangement HiFlo
plus " is not to be used, is marked in red.
8.7.1 Rotary lobe change - VX100Q, VX136Q, VX186Q, VX230Q series

Fig.
“Rotary lobe change, Q series"
1. Open Q cover (5)

Chapter "Opening the Q cover".
2. Remove plug (7) and anti-fatigue bolts (VX136Q, VX186Q) or hexagon socket head cap screws
(VX100Q) (8) in the rotary lobes (11). Pull off the pressure disc (9) using a suitable screw (anti-fatigue
bolt, hexagon socket head cap screw) or with the threaded rod of the rotary lobe puller and remove
the spring washers (10).

With the VVA series with rubberized rotary lobes (not with solid material lobes), the rotary lobe
core is protected by an additional sealing ring in which the pressure disc and spring washers
are located. Dismount this sealing ring and reinstall it after the rotary lobe change.
3. Pull the rotary lobes from the shafts using a rotary lobe puller (see spare parts list). With the VX230Q
series the rotary lobes can be pulled off the shafts using a commercially available universal puller with
a span width of 200 mm and a span depth of 150 mm.

Pull HiFlo- and HiFlo plus- rotary lobes off the upper and lower shaft in pairs.
4. Install the new rotary lobes in reverse sequence

Fig. "HiFlo and HiFlo plus arrangement ".

Before installing the new rotary lobes, thoroughly clean the contact surfaces of rotary lobes and
seal components!
5. With the VX136Q series install two spring washers per shaft, with the VX100Q, VX186Q and VX230Q
series, install one spring washer per shaft

Fig. "Position of pressure disc and spring washers".

Make sure that the spring washers are the correct way round in the pressure disc.

Carefully press the pressure disc and spring washers into the rotary lobe groove. Spring
washers must not fall into the extracting groove.

Use the anti-fatigue bolt or hexagon socket head screw to tighten spring washers and pressure
disc

Chapter
“Tightening torques of the hexagon socket head cap screws for mounting the
pressure disc".

Install plug (7).
6. Close Q cover

Chapter "Closing the Q cover".
7. Apply pressure to buffer chamber

Chapter "Buffer chamber".
Material FPM for rotary lobes
The material 'FPM' for rotary lobes is usable only up to max. 6 bar. Please note the maximum operating
pressure

Chap.
“Technical data".
Fig. 27 : Rotary lobe change, Q series