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 (12). An oil ller-plug (1) is ed to the top of the oil box. The pump has an oil
drain-plug (11) to allow gravity oil drain.
The pump has an inlet-port (6), outlet nozzle (2) and gas-ballast control (3). The pump is
mounted on two mild steel box secon skids (10) on rubber pads. Details of suitable
vibraon isolators and other recommended accessories are given in Accessories on page
44.
Page 10
A37310880_V - Introducon
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