Blowers

EDWARDS

BOC EDWARDS EH BLOWER VACUUM BOOSTER PUMPS:

The EH pumps are compact and have high pumping speeds. You must use the EH pump with a suitable backing pump. The EH pumps can operate with a maximum continuous inlet pressure of 1000 mbar. You can achieve low system pressures by the use of two or more EH pumps in series. The EH pump coupling-cover is connected to the pump outlet and forms an integral part of the vacuum system. The connecting lines have a filter which removes debris and so prevents contamination of the lubricating oil and bearings. For an even cleaner system, you can evacuate the coupling-cover and bearings by connection to the pump-inlet or to an external vacuum pump. The hydrocarbon safe area and chemical EH pumps use hydrocarbon oils, such as Ultragrade 20. Versions of the safe area pumps for use with PFPE (perfluoropolyether) oils are also available for vacuum systems in which oxygen or other reactive or corrosive gases are pumped. All the EH pumps have ISO inlet-flange and outlet-flange connections.

 

TECHNICAL DATA Value EH-250 EH-500 EH-1200
Displacement (SweptVolume)

50Hz

60Hz
CFM
375 m3h-1, 220 ft3min-1
310 m3h-1, 185 ft3min-1
605 m3h-1, 355 ft3min-1
505 m3h-1, 300 ft3min-1
1435 m3h-1, 845 ft3min-1
1195 m3h-1, 715 ft3min-1
Rotational Speed

50Hz

60Hz
rpm
0 – 3500
0 – 2900
0 – 3500
0 -2900
0 – 3500
0 – 2900
Operating Continuous Inlet
Pressure Range (With Suitable
Backing Pump)
Torr
0 – 760 torr, 0 – 1000 mbar
0 – 760 torr, 0 – 1000 mbar
0 – 760 torr, 0 – 1000 mbar
Maximum Oulet Pressure
Torr
760 torr, 1000 mbar
760 torr, 1000 mbar
760 torr, 1000 mbar
Electrical Supply Voltage, 3 Phase

50Hz

60Hz
V
208 – 230 VAC / 460 V
240 VAC / 380-415 V
208 – 230 VAC / 460 V
240 VAC / 380-415 V
208 – 230 VAC / 460 V
240 VAC / 380-415 V

 

BOC EDWARDS QMB BLOWER VACUUM BOOSTER PUMPS:

 

Pumps International offers Edwards QMB mechanical booster pumps with a maximum continuous inlet pressure which is 20 mbar for the QMB250F and QMB500F and 1 mbar for the QMB1200F. All these pumps are reconditioned with the highest quality parts and highest trained technicians because our business relies on keeping your business up and running with our quality pumps. The QMB250F and QMB500F pumps are air cooled and the QMB1200F pump is water cooled. All the QMB pumps have enclosed, water cooled motors and are therefore suitable for applications in clean environments where fan cooling is unacceptable. The pump coupling cover is connected to the pump outlet and forms an integral part of the system. The connecting pipelines have a filter which removes debris and so prevents contamination of the lubricating oil and bearings. For an even cleaner system, the coupling cover and bearings can be evacuated by connection to the inlet or to an external vacuum pump.
Three motor protection thermistors,one on each winding, are fitted to the motor of the QMB pump. These thermistors are solid state devices which have an electrical resistance of 100 to 500 W at normal motor operational temperature. When the motor is too hot, the electrical resistance rises quickly to 3000 W. The thermistors are connected in series and you can connect the thermistors to control equipment to automatically shut down the system if a motor is too hot. The QMB pumps are positive displacement Roots vacuum pumps. The pump mechanism is driven by a three phase electric motor through a hydrokinetic fluid coupling. The motor is enclosed and is cooled by integral cooling water coils.
The pump shafts and rotors are made of corrosion resistant, cast iron. The internal and external shaft seals are made of polytetrafluoroethylene (PTFE) or fluoroelastomer. The bearings, gears and seals are lubricated by oil fed from reservoirs in the coupling cover. A series of seals stops the oil from reaching the vacuum side of the pump. The coupling cover is evacuated. You can inspect the oil-levels through sight glasses which are fitted to the coupling cover. Oil filler, oil drain and external evacuation connections are provided on the cover. The QMB250F and QMB500F pumps have rear bearings which are lubricated by perfluoropolyether (PFPE) grease. The QMB1200F pump gears are lubricated by oil in the gear cover. The gear cover of the QMB1200F has oil filler and oil drain plugs and an oil level sight glass. The QMB pumps are suitable for use only with PFPE oils.

 

TECHNICAL DATA Value QMB250 QMB-500 QMB-1200
Mass
Kg
65
78
157
Minimum Cooling-Water Flow
l.h-1
75
75
75
Oil Capacity
Coupling Cover
Shaft Seal Resevoir
Gear Case
l
1.5
0.125
–
1.5
0.125
–
1.5
0.125
1.25
Rotational Speed
50 Hz SUPPLY
60 Hz SUPPLY
r.min-1
0 to 2900
0 to 3500
0 to 2900
0 to 3500
0 to 2900

0 to 3500
Ultimate Pressure Without
Gas-ballast, Permanent Gases
mbar
8 x 10-4 mbar
8 x 10-2
8 x 10-4 mbar
8 x 10-2 Pa
8 x 10-4 mbar

8 x 10-2 Pa
Pressure Differential Across
Pump Determined by
Hdrokinetic Drive
mbar
0 to 180 mbar
0 to 1.8 x 104 Pa
0 to 110 mbar
0 to 1.1 x 104 Pa
0 to 90 mbar
0 to 9 x 103 Pa
Vacuum Connections
Inlet Connection
Outlet Connection
ISO
ISO63 Bolted
ISO40 Bolted
ISO100 Bolted
ISO63 Bolted
ISO160 Bolted
ISO100 Bolted

 

LEYBOLD:

OERLIKON LEYBOLD RUVAC BLOWER BOOSTER VACUUM PUMP:

The Oerlikon Leybold Root’s blower vacuum pumps are driven by air or water-cooled canned motors. They have no shaft feed through to the atmosphere, thus they are particularly leak tight. In the canned motor, rotor and stator pack are separated by a vacuum-tight can made of a nonmagnetic material. The rotor operates on the drive shaft of the pump in the vacuum, so that a shaft seal which would be subject to wear is not required. Do not switch on the Oerlikon Leybold RUVAC blower until the backing pump has evacuated the vacuum vessel to the cut-in pressure. For processes in which condensable vapors are pumped, it is advisable to evacuate the vacuum vessel via a roughing line to the cut-in pressure. Electrically switch on the Roots pump together with the backing pump and cut it in upon reaching the cut-in pressure. The initial bypassing of the Roots pump serves to prevent condensation of vapors in the cold pump. The permissible cut-in pressure can be calculated based on the ratio between the Roots pump and the backing pump. A typical cut-in pressure is around 33.5 Torr. With small vacuum vessels, the maximum permissible pressure differential can be briefly exceeded (max. 3 min) upon start-up. If a pressure switch has been installed, do not set it to this higher pressure because it will fail to protect the pump against overload in the event of a greater gas quantity. It is advisable to switch the Oerlikon Leybold RUVAC blower on and off via a pressure switch to ensure that it runs only in the permissible pressure range.

 

TECHNICAL DATA WS/WSU Value 151 251 501 1001 2001
Displacement
CFM
108
179
357
707
1449
Backing Pump Speed

CFM
21
33
53
132
264
Flange Connections, Standard
ANSI
3-inch
3-inch
3-inch
3-inch
3-inch
Flange Connections, Optional
ISO-K

63
63
63
100
150
Rotation Speed (Nominal)
rpm
3600
3600
3600
3600
3600
Permissible Ambient Temperatures
hp
1.5
1.5
1.5
1.5
1.5
Oil Filling for Pump
Vertical
Horizontal
qt
qt
0.75
0.55
0.75
0.55
1.10
0.75
2.10
1.30
4.20
2.10
Normal Starting Pressure
at Backing Pump Speed
Torr/CFM
35 / 28

23 / 46
28 / 113
20 / 177
16 / 445
Maximum Differential Pressure
Continuous Operation
Torr
98
60
60
60
38
Maximum Differential Pressure

Intermittent Operation
Torr
150
90
90
90
57
Weight
WS
WSU
lb
lb
206
216
216
227
304
315
526
537
1046
1061
May 3rd, 2012 by Boop | Type: Standard
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Pumps International Inc