background image

- 4 -

MD

ND

HD

2

2

3.2.2 By-Pass Valves.

Two spring-loaded by-pass valves are provided between HP-/
MP and MP- /LP stages.  These valves have the following
functions:  when the pump is started at atmospheric pressure,
the valves open owing to the excess pressure between stages.
This excess pressure is due to the greater suction capacity of
the LP-stage.  The gas now flows directly into the exhaust until
the pressure between stages falls below atmospheric pressure
owing to the lower suction.

3.2.3 Cooling

The entire VLV range is air-cooled.  A centrifugal fan is mounted
on the pump driving shaft between drive motor and LP-stage.  It
draws fresh air between HP-stage and oil reservoir.  The air
rises through ducts in the casing of the individual stages and is
expelled by the fan.

3.2.4 Lubrication

An oil lubricating pump, supplying fresh oil to the compression
chambers of the 3 or 2 stages and to the upper rotor bearing, is
mounted on the fresh oil reservoir.  The VLV-2 oil lubricating
pump has 4 lubrication points and the VLV-3 has 6.
The lubricating oil flows from the upper rotor bearing, through
orifices in the casing cover and a pipe, to the lower rotor bearing.
It then flows into bearing cover B which lubricates the oil pump
drive.  From this container the oil passes through an overflow
orifice, back into the fresh oil reservoir.

3.2.5 Oil separation

The oil-containing exhaust flows from the HP-stage into the
used oil and condensate reservoir.  A large proportion of the oil
separates from the air.
The remaining oil is then separated in the oil mist separator in
candle filters which are over 99% effective.  Technically pure air
is obtained at the outlet.

3.2.6 Sealing of stages

LP- and HP-stages are sealed from the bearing chamber by two
respective shaft seals.
Shaft seals which come into contact with the suction medium
are made of PTFE, Viton being used elsewhere.
The rotor bearings do not come into contact with the suction
medium.

3.2.7 Drive

The drive is transmitted from the motor to the compressor
stages directly by a flexible coupling.

3.2.8 Standard VLV design

• Flange connections according to DIN 28404
• Stainless steel oil mist separator
• Brass level switch (fresh oil reservoir)
• Stainless steel level switch (condensate and used oil res-

ervoir)

• Grey cast iron condensate and used oil reservoir
• Exhaust connection in 3 different directions is possible (see

D 140 and D 141)

Construction VLV

Drive motor

Cooling air exit

Oil separator

Exhaust air connection

Level control

Waste oil- and
condensate drain

Condensate- und
waste oil tank

Fresh oil tank

Level control

Oil metering pump

Vacuum connection

Manometer for
separator control
(Optional extra)

Cooling air entry

Measuring points

Summary of Contents for Elmo Rietschle VLV Series

Page 1: ...80 2 VLV 80 3 VLV 100 2 VLV 100 3 Gardner Denver Schopfheim GmbH Postfach 1260 79642 SCHOPFHEIM GERMANY Fon 49 7622 392 0 Fax 49 7622 392 300 e mail er de gardnerdenver com www gd elmorietschle com B...

Page 2: ...uumpumpen VLV 5 3 2 14 Einsatzgrenzen VLV 5 4 Installation und Inbetriebnahme 5 4 1 Mechanische Installation 5 4 1 1 Aufstellung 5 4 1 2 Saugseite 5 4 1 3 Abluftseite 5 4 2 Elektrische Installation 6...

Page 3: ...len oder ein Ausfall derVakuumpumpezueinerGef hrdung vonPersonenoderEinrichtungenf hrt sind entsprechende Sicherheitsma nahmen anlagenseits vorzusehen 3 Ausf hrungen und Aufbau 3 1 Ausf hrungen Die Ty...

Page 4: ...er 3 bzw 2 Stufen und das obere Rotorlager mit Frisch l versorgt Die lschmierpumpe hat 4 Schmierstellen bei der VLV 2 bzw 6 Schmierstellen bei der VLV 3 Bei der Lagerschmierung flie t das l vom oberen...

Page 5: ...Dauer f r den Vor und Nachlauf liegt bei ca 20 30 Minuten Ausreichende K hlm glichkeit der Pumpe mu vorhanden sein siehe 4 1 1 Aufstellung berpr fen ob die Umgebungsluft stark aggressiv ist da evtl A...

Page 6: ...f r Motor und f r die Steuerung der Kontroll Einrichtungen befinden sich im Klemmenkasten Jede Anschlu klemme der Klemmenleiter hat eine Nummer und alle Anschl sse f r Motor und Kontroll Organe sind...

Page 7: ...ge Weniger l Mehr l lschmierpumpe VLV 25 2 25 3 40 2 40 3 60 2 60 3 80 2 80 3 100 2 100 3 50 Hz 0 065 0 097 0 065 0 097 0 065 0 195 0 065 0 195 0 065 0 195 60 Hz 0 078 0 117 0 078 0 117 0 078 0 234 0...

Page 8: ...t bersteigen Wird das Endvakuum nicht erreicht folgende Arbeiten durchf hren Sieb im Saugflansch ausbauen und reinigen berstr mventile ausbauen auf Funktion berpr fen Vakuum zwischen ND MD und HD Stuf...

Page 9: ...0 2 VLV 80 3 VLV 100 2 VLV 100 3 Gardner Denver Schopfheim GmbH Postfach 1260 79642 SCHOPFHEIM GERMANY Fon 49 7622 392 0 Fax 49 7622 392 300 e mail er de gardnerdenver com www gd elmorietschle com Vac...

Page 10: ...y 5 4 Installation and commissioning 5 4 1 Mechanical installation 5 4 1 1 Installation 5 4 1 2 Suction side 5 4 1 3 Exhaust 5 4 2 Electrical installation 6 4 2 1 General 6 4 2 2 Electrical connection...

Page 11: ...planned shut down of the pump could possibly cause harm to persons or installations then the corresponding safety backup system must be installed 3 Design and Construction 3 1 Models The VLV range is...

Page 12: ...ntainer the oil passes through an overflow orifice back into the fresh oil reservoir 3 2 5 Oil separation The oil containing exhaust flows from the HP stage into the used oil and condensate reservoir...

Page 13: ...cations Vacuum for printed circuit board production Carbonisation in drink production Vacuum packaging of moist products Vacuum cooling of foods Vacuum filtration Vacuum drying Vacuum crystallisation...

Page 14: ...numbered and all connections for motor and monitoring elements are allocated a specific number see circuit diagram Connection numbers must be observed during refitting or repair work to simplify detec...

Page 15: ...tion for VLV l hr Oil Consumption for VLV Roots booster on request VLV 25 2 25 3 40 2 40 3 60 2 60 3 80 2 80 3 100 2 100 3 50 Hz 0 065 0 097 0 065 0 097 0 065 0 195 0 065 0 195 0 065 0 195 60 Hz 0 078...

Page 16: ...the instruction manual c Maintenance during Storage The pumps should be operated once a month for about 2 hours to prevent any kind of corrosion within the pump Please pay attention to the fact that t...

Reviews: