The Edwards EH mechanical booster pumps feature a unique hydrokinetic drive which provides efficient power transmission with benefits in economy, performance and compactness. These booster pumps are suitable for use with high differential pressures which allow the booster pump to be started at the same time as the backing pump, reducing total pump down times.
EH250
EH500
EH1200
EH2600
EH4200
The EH250C mechanical booster pump has been certified for use in CSA Division 1 area Gas Class I Group C D and Dust Class II Group F G, Temperature Class T3C. The temperature classification of the pump is based on the outlet pressure of the pump being maintained below the critical backing pressure of 10 mbar (1 x 103 Pa) at zero flow.
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The EH500C mechanical booster pump has been certified for use in CSA Division 1 area Gas Class I Group C D and Dust Class II Group F G, Temperature Class T3C. The temperature classification of the pump is based on the outlet pressure of the pump being maintained below the critical backing pressure of 10 mbar (1 x 103 Pa) at zero flow.
�. Depends on pressure
The EH1200C mechanical booster pump has been certified for use in CSA Division 1 area, Gas Class I, Group C D and Dust Class II Group F G, Temperature Class T3C. The temperature classification of the pump is based on the outlet pressure of the pump being maintained below the critical backing pressure of 10 mbar (1 x 103 Pa) at zero flow.
* Under many circumstances, pumps may operate without cooling water. Apply to Edwards for more information.
†. Depends on pressure
The EH2600C mechanical booster pump has been certified for use in CSA Division 1 area, Gas Class I, Group C D and Dust Class II Group F G, Temperature Class T3C. The temperature classification of the pump is based on the outlet pressure of the pump being maintained below the critical backing pressure of 10 mbar (1 x 103 Pa) at zero flow.
* Under many circumstances, pumps may operate without cooling water. Apply to Edwards for more information.
†. Depends on pressure
The EH4200C mechanical booster pump has been certified for use in CSA Division 1 area, Gas Class I, Group C D and Dust Class II Group F G, Temperature Class T3C. The temperature classification of the pump is based on the outlet pressure of the pump being maintained below the critical backing pressure of 10 mbar (1 x 103 Pa) at zero flow.
* Under many circumstances, pumps may operate without cooling water. Apply to Edwards for more information.
�. Depends on pressure
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.
