Rebuilt Dry Claw Vacuum Pumps

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

Edwards QDP40/QMB250 Dry Claw Vacuum Pump Rebuilt Refurbished

Item Number: 7NN57SN2M9QMB250

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.

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Edwards QDP40/QMB250 Dry Claw Vacuum Pump Rebuilt Refurbished

Overview
Specifications
Our Guarantee
Our Warranty
Shipping

QDP Overview

The QDP pumps operate at pressures between atmospheric and ultimate vacuum with no lubricating or sealing fluid in the pumping chamber. This ensures a clean pumping system without back-migration of oil into the system being evacuated.

QDP pumps have enclosed, water-cooled motors and are therefore suitable for applications in clean environments where fan cooling is unacceptable.

The QDP Pump

The QDP pumps are each fitted with a gas system, exhaust-silencer and check-valve. The pump is fixed to the framework by vibration isolators. The framework has castors and levelling feet.

The QDP pumps are four-stage, positive displacement rotary pumps in which pairs of intermeshing rotors (of different profiles mounted on common shafts) are held in correct phase relation by a pair of timing-gears. The timing-gears and the adjacent double-row angular contact ball-bearings, are oil lubricated.

The pump shafts and rotors are made from cast-iron. The internal and external shaft-seals on the motor drive-shaft are made of polytetrafluoroethylene (PTFE). Bearings are located on the high vacuum end of the shaft, near to the pump-inlet. These bearings are packed with perfluoropolyether (PFPE) grease.

Gas System

QDP pumps have a gas system of stainless steel pipelines (see Figure 1) which allows nitrogen to be delivered to the following points :

Inlet-purge
Shaft-seal purge
2/3-interstage purge
Exhaust-purge
3/4-interstage purge.

You will connect your nitrogen supplies to this gas system through connectors on the gas services panel

Temperature control system

The low vacuum stage of the pump has an indirect cooling system, all other stages are air-cooled by natural convection and radiation. In the secondary circuit of the indirect cooling system, coolant circulates around the pump-body by natural convection. In the primary circuit, cooling-water is circulated through copper coils to extract heat from the coolant. In operation, the pump is maintained at a constant temperature by a thermostatic control-valve (TCV) which controls the supply of cooling-water to the primary circuit in the pump.

The pump-motor is cooled by water flowing through a cooling jacket which surrounds the motor. The pump-motor cooling circuit is separate from the pump cooling circuit. The cooling-water supply and return pipelines are connected to the pump by connectors on the water services panel at one end of the pump

The cooling-water manifold on the pump distributes the cooling-water to the pump cooling circuit and to the pump-motor cooling circuit (and to the QMB pump-motor cooling circuit, if a QMB pump is fitted). When a QMB pump is not fitted, the flow of cooling-water to the QDP pump-motor is greater than the minimum required flow. When a QMB pump is fitted, the cooling-water flow is distributed equally between the two pump-motors and the overall flow requirement for the pumping combination increases

Two thermal snap-switches are fitted to the pump-body. One of these snap-switches (the warning switch) opens at 88 oC and the other snap-switch (the shut-down switch) opens at 95 oC. Use the warning switch to provide a warning that the pump is too hot. Use the shut-down switch to shut down the pump.

Three motor-protection thermistors are fitted to the pump-motor (one on each winding). 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 use the output of the thermistors to shut down the pump because the motor is too hot.

Electrical system

The QDP pumps have universal voltage and frequency motors. These motors are supplied configured for ‘low voltage’ operation (200-208 V at 50 Hz or 200-230 V at 60 Hz).

You will connect your electrical supply cable to the pump through a cable-gland on the terminal-box on the end of the pump-motor (see Figure 10). You must use a suitably rated contactor (see Section 2.4). The electrical services panel has a connector to connect the outputs of the thermal snap-switches and the motor-protection thermistors to your control equipment.

Exhaust system

The pump outlet is connected to an exhaust-silencer, which is below the pump. The outlet also has a port which allows gearbox vent gases to join the main exhaust stream (see Figure 1). The exhaust-silencer attenuates the pulses in the exhaust pressure and reduces pump-induced resonance in your exhaust-extraction system. The outlet of the silencer has a check-valve which prevents the suck-back of exhaust vapors after the pump is shut down. The valve also provides additional attenuation of the pulses in the exhaust pressure.

Accessories

A number of accessories are available for the QDP pump; use these to configure the pumps for specific applications.

QDP40 General Specifications
Mass	172 kg
Motor rating	2.2 kW
Warm-up time to nominal performance	15 min
Inlet connections	ISO40
Outlet connections	NW40
Vacuum system maximum leak-rate	1 x 10^-5 mbar.ls^-1(1 x 10^-3 Pa.ls^-1)
Exhaust system maximum leak-rate	1 x 10^-5 mbar.ls^-1(1 x 10^-3 Pa.ls^-1)
Ambient operating temperature range	5 to 40 °C
Maximum ambient operating humidity	90% RH
Protection degree (as defined by IEC 529)	IP44
Continuous A-weighted sound pressure level (at 1 meter)	< 70 dB(A)

Performance data
Typical peak pumping speed 50Hz 60Hz	44 m3h^-155 m3h^-1
Displacement (swept volume) 50Hz 60Hz	52 m3h^-1 62.4 m3h^-1
Typical ultimate vacuum without gas-ballast 50Hz 60Hz	5 x 10^-2 mbar (5 x 10⁰ Pa) 3 x 10^-2 mbar (3 x 10⁰ Pa)

Services
Electrical Supply Supply Voltage Voltage tolerance	200-208/380-415 V at 50 Hz, 3-phase 200-230/460 V at 60 Hz, 3-phase ±10% (except for 208 V and 415 V at 50 Hz= which are +6% and -10%)
Cooling Water Maximum supply pressure Minimum required pressure differential across supply and return Typical heat removed from pump Maximum water consumption Maximum particle size in supply	100 psi (6.9 bar absolute, 6.9 x 10⁵ Pa) 30 psi (2.1 x 10⁵ Pa) 1.75 kW See Table Below 0.03 mm²
Nitrogen supply Supply pressures and flow rates Fittings type	For recommendations, see Table 2 1/4 inch compression

Table 1: Maximum cooling-water consumption
Pump Operating Temperature (at thermal snap-switch position)	Maximum water consumption at ultimate vacuum with 50 Hz electrical supply, cooling-water supply temperature of 20 oC and a pressure differential across the supply and return of 30 psi (2.1 x 10⁵ Pa)
55 °C 70 °C 90 °C	300 lh^-1 150 lh^-1 135 lh^-1
* The 88° thermal snap-switch must be configured to provide warning only, or you must fit the high temperature thermal snap-switch kit:
Table 2 - Recommended nitrogen supply pressures and flow rates
	Shaft-seals purge	3/4-interstage purge	2/3-interstage purge	Inlet purge	Exhaust purge
Supply pressure (min)	8 psig (1.55 x 10⁵ Pa)	-	-	-	-
Supply pressure (max)	10 psig (1.69 x 10⁵ Pa)	-	-	-	-
Flow Rate (1.min^-1)	25 (max)	20 (max)	5 (max)	25 (max)	5 (typical)

Full load current ratings
Supply voltage and frequency	200-208 V 50Hz	200-208 V 60Hz	230 V 60 Hz	380-415 V 50Hz	460 V 60 Hz
Full Load (A) Rating (kW)	8.7 2.2	8.8 2.2	7.8 2.2	5.0 2.2	4.4 2.2

Temperature control system
Water Cooling System Type Coolant capacity	Indirect water-to-coolant heat exchanger 1.7 litres
Thermostatic control-valve Manufacturer Model Working temperature range Maximum sensor temperature	Danfoss AVTA DN15 50 to 90 °C 130 °C
Thermal snap-switches Manufacturer Model Opening temperatures Closing temperatures Contact rating Maximum voltage Maximum current (inductive load) Maximum current (resistive load)	Fenwal Inc 08-02 88 °C (warning switch) 95 °C (shut-down switch) 78 °C (warning switch) 85 °C (shut-down switch) 240 V 6.3 A 12 A
Motor-protection thermistors Type Reference temperature Compliant with Recommended control-unit Relay contact rating	Positive temperature coefficient 160 °C IEC 34-11 (BS4999 part 111) To comply with IEC 34-11 (BS4999 part 111)

Electrical connectors
17-way connector Pump half Cable half	MS type, CA3100E20-29P/F80 MS type, CA3106E20-29S

Gearbox
Oil capacity Grade of oil ISO viscosity grade Recommended perfluoropolyether oils	0.4 litres SAE 40 150 Fomblin Y25, Krytox 1525

High vacuum bearings
Grease type Recommended grease	Perfluoropolyether Fomblin RT15

Exhaust-silencer
Gas temperature Exhaust pulsation attenuation Mass	5 to 150 °C 30 dB(A) 5.5 kg

Exhaust check-valve
Gas temperature Reverse flow leak tightness when clean (minimum) Mass	5 to 130 °C 0.4 mbar.ls^-1 (4 x 10¹ Pa.ls^-1) 0.95 kg

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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.

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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.

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Rebuilt Dry Claw Vacuum Pumps

Edwards QDP40/QMB250 Dry Claw Vacuum Pump Rebuilt Refurbished

Edwards QDP40/QMB250 Dry Claw Vacuum Pump Rebuilt Refurbished