The E1M18 and E2M18 pumps are direct drive, sliding vane pumps. The E1M18 is a
single-stage pump and the E2M18 is a two-stage pump. The pump is oil-sealed and
designed for reliable, long-term operaon in both laboratory and industrial
environments. The pump is a free-standing unit. The drive is provided through a exible
coupling by a single-phase or three-phase (four pole) motor. The motors are totally
enclosed and are cooled by the motor-cooling fan which directs air along the motor ns.
The single-phase motors have a thermal overload device. When the motor is too hot,
the thermal overload device switches o the pump. The thermal overload device has an
automac reset; when the motor cools down, the device resets and the motor will
restart. The single phase motors have an on/o switch.
An oil pressure system lubricates the pump sha bearing surfaces and rotor sealing
faces. The pump has an oil distribuon valve which prevents discharge of oil to the
pump interior (suckback) aer the pump stops. The pumping chambers are air-ght, so
this arrangement prevents air suckback unless the gas-ballast valve is open. For
protecon in this case, refer to Gas-ballast on page 11.
The level and condion of oil in the oil box reservoir can be inspected through the oil
sight-glass. An oil ller-plug is ed to the top of the oil box. The pump has an oil drain-
plug to allow gravity oil drain.
The pump has an inlet-port, outlet nozzle and gas-ballast control. The pump is mounted
on two mild steel box secon skids on rubber pads. Details of suitable vibraon isolators
and other recommended accessories are given in Accessories on page 46.
Page 10
A34310880_T - Introducon
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