Description

Edwards E2M30 Dual Stage Rotary Vane Pump A374-15-903

Code A374-15-903

The EM range of oil-sealed rotary pumps – renowned for their high ultimate vacuum, rapid pumping speed, quiet operation and ability to handle vapour – have become the industry standard for laboratory and light industrial applications. The pump is a freestanding unit with the drive provided through a flexible coupling by a single-phase motor.

The motor is totally enclosed and is cooled by the motor-cooling fan which directs air along the motor fins. The motors are fitted with a thermal overload device. When the motor is too hot, the thermal overload device switches off the pump. The thermal overload device has an automatic reset; when the motor cools down, the device resets and the motor will restart.

An oil pressure system lubricates the pump shaft bearing surfaces and rotor sealing faces. The pump has an oil distribution valve which prevents discharge of oil to the pump interior (suckback) after the pump stops. The pumping chambers are air-tight, so this arrangement prevents oil suckback unless the gas ballast valve is open.
You can inspect the level and condition of oil in the oil box reservoir through the oil sight-glass. An oil filler-plug is fitted to the top of the oil box. The pump has two oil drain-plugs to allow either gravity oil drain or pressure oil drain.

Displacement (swept volume)
50 Hz 19 cfm
60 Hz 23 cfm
Maximum Pumping Speed
50 Hz 16.2 cfm
60 Hz 19.4 cfm
Rotational Speed
50 Hz 1440 r min-1
60 Hz 1720 r min-1
Ultimate vacuum (total pressure)
without gas ballast (partial pressure) 7 x 10-5 torr
without gas ballast (total pressure) 7 x 10-4 torr
with full gas ballast (partial pressure) 1.5 x 10-1 torr
Maximum Water Vapor Inlet Pressure: 22.5 torr
Maximum Water Vapor Pumping Rate 0.7 kg h-1
Oil Capacity 1.32 L
Recommended Oil Type Ultragrade 19
Weight 44 kg / 97 lbs