General description – Hale SMR-U User Manual

Page 5

GENERAL DESCRIPTION

The Godiva WS series single stge pump is a single pressure pump. It delivers
high volume, low pressure (LP) output water.
The pump is generally driven in a clockwise direction viewed from the drive end. The
pump may also be specified configured to rotate in a counter-clockwise direction.
The pump drive shaft, which runs on angular contact and roller bearings in an oil
bath, is of stainless steel. Shaft sealing of the pump is by a special Godiva
mechanical seal face, which ensures efficiency and long life without adjustment. The
electronic tachometer sender is mounted adjacent to the drive flange.

Priming of the pump is achieved automatically by means of a pair of positive
displacement piston primers mounted on either side of the bearing housing. These
primers begin to operate as soon as the pump drive shaft begins to rotate, driven by
an eccentric bearing on the pump shaft. Air within the pump will be expelled and as
long as the suction connections have been made and the hose end submerged, the
pump will prime and the pistons will disengage by 1.5 bar. The pump should be
primed at any speed between 1000-2500 rpm. The pump speed should not be
increased further until the primers have disengaged and the pump is primed.

An optional alternative priming system – the Godiva water ring primer – is available
in place of the piston primer system. With the water ring primer, when the pump is
started, the primer shaft is driven by its fibre driving wheel which contacts the pulley
on the pump drive shaft and is lifted off by a disengaging cylinder as the pump is
primed and pressure builds up in the pump. An alternative to friction pulley drive is
belt-drive through an electro-magnetic clutch. When the pump is primed and
pressure builds up, a pressure switch turns off the clutch drive.

Non-return valves are built into both the piston and water ring priming systems to
prevent air flowing back through the primers, thus “breaking the prime”.

As the pump is reduced to idling and the pressure within the pump decreases, the
pistons will once again reengage to act as a pump and discharge any water
remaining in the pump.

A World Series Options Manual is available which shows many of the standard
specifications currently available together with an indication of their positions relative
to datum points on the pump.