Save 10% on your first order! »Details

IVS Main Office

IVS City of Industry/West Coast


Rebuilt Dry Claw Vacuum Pumps

Dry claw vacuum pumps 100% rebuilt, restored to original equipment manufacturers specifications.

Edwards QMB1200 Claw Type Dry Vacuum Pump Rebuilt Refurbished with motor

Edwards QMB1200 Claw Type Dry Vacuum Pump Rebuilt Refurbished with motor
    Item Number: EDWARDS-QMB1200

    Warranty: 1 year past the documented date of installation.

    *Product images are for reference purposes only and do not necessarily correspond to the actual product.  

    Please call for price and availability

    IN STOCK - Please call for price and availability 855-466-6822

    Edwards QMB1200 Claw Type Dry Vacuum Pump Rebuilt Refurbished with motor


    BOC Edwards QMB Mechanical Booster Pumps are compact and have high pumping speeds. Low system pressures can be achieved by using two or more mechanical booster pumps in series. You must use the QMB Mechanical Booster Pump with a suitable backing pump. The maximum continuous inlet pressure is 20 mbar for the QMB250F and QMB500F Mechanical Booster Pumps and 1 mbar for the QMB1200F Mechanical Booster 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 vacuum 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 pump-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 pump-motor operational temperature. When the pump-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 pump-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 high-grade, corrosion-resistant, cast-iron. The internal and external shaft-seals are made of polytetrafluoroethylene (PTFE) or fluoroelastomer.

    The pump-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.

    Principle of operation

    The motor-shaft drives one of the rotors through the fluid-coupling in the QMB mechanical booster pump. The 1:1 gears inside the coupling-cover drive the second rotor in the opposite direction inside the stator housing. A small, accurately gauged, clearance is maintained between the rotors and between each rotor and the stator wall. This clearance allows thepumpto operate at high speed without mechanical wear and without the need for lubrication inside the swept volume.

    Hydrokinetic fluid-coupling

    The hydrokinetic fluid-coupling connects the electric-motor shaft to the rotor. This system is configured so that when the gas-load is high the rotational speed of the rotors is reduced. As the gas-load decreases, the rotors accelerate to full speed. This allows continuous operation of the pump over the vacuum range without the risk of overloading the motor and removes the need for bypass-valves and associated pipelines.

    Edwards QMB1200 Technical Data
    General QMB1200
    Continuous inlet pressure 0 to 1 mbar, 0 to 100 Pa
    Maximum outlet pressure 1000 mbar, 1 x 105 Pa
    Ambient operating temperature range 5 to 40 °C
    Maximum operating humidity 90% RH
    Protection degree (as defined by IEC 529) IP44
    Recommended oil type Fomblin YVAC 16/6 or Krytox 1514
    Electrical Data  
    Number of phases 3
    Supply voltage 200-208 V/380-415 V at 50 Hz
    200-230 V/460 V at 60 Hz
    Voltage tolerance ±10%, except 208 and 415 V at
    50 Hz which are +6% and -10%
    Full load current ratings
    Supply voltage and frequency 200-208 V 50 Hz 200-208 V 60 Hz 230 V 60 Hz 380-415 V 50 Hz 460 V 60 Hz
    QMB1200 Full load (A) 16 16 14.2 8 8
    Rating (kW) 4 4 4 4 4
    Motor protection thermistors
    Reference temperature
    Compliant with
    Recommended control-unit

    Positive temperature coefficient
    160 °C
    IEC 34-11
    To comply with IEC 34-11
    Mass (kg) 157
    Minimum cooling-water flow (l.h-1) 75
    Oil capacity (l)
    Shaft-seal reservoir

    Rotational speed (r.min-1)
    50 Hz supply
    60 Hz supply

    0 to 2900
    0 to 3500
    Ultimate pressure without
    gas-ballast, permanent gases
    8 x 10-4 mbar
    8 x 10-2 Pa
    Pressure differential across pump
    determined by the hydrokinetic drive
    0 to 90 mbar
    0 to 9 x 103 Pa
    Recommended backing-pump QDP40 or QDP80
    Vacuum connections
    Inlet connection
    Outlet connection

    ISO160 bolted
    ISO100 bolted
    Cooling-water connections
    Inlet connection (BSP)

    Outlet connection (BSP)

    Hansen quick connect
    3/8 inch male

    Hansen quick connect
    3/8 inch female
    Noise data
    Continuous A-weighted
    sound pressure level (dB(A))

    IVS is committed to your complete satisfaction.  To ensure the greatest success and performance of your new vacuum equipment purchase, please call an IVS representative today at 855-466-6822 or simply fill out our contact form here: Contact IVS and a Sales Engineer will contact you within 24 hours.

    Not exactly what you're looking for? Innovative Vacuum Solutions is a total solutions provider and can customize or configure your vacuum equipment. Call us toll free at 855-466-6822 and speak to a Sales Engineer to determine your specific needs.


    Our precision vacuum pump rebuild process restores worn or damaged equipment back to the original manufacturers specifications and
    costs a fraction of purchasing new components. Each unit reconditioned by IVS is supported by the most competitive,
    practical warranty in the business: one year from the documented date of installation, not shipment.

    Click here to see the full IVS Business Practical Warranty
    • IVS will safely package your product for shipment at no additional charge.
    • Buyer is responsible for all shipping arrangements and charges.
    • Please allow ten days for delivery from order date to allow for certification and shipping of your equipment.

    You may also like


    For news and special offers, including 10% off your first purchase, please join our mailing list!

    Captcha Image