Flowserve DMX - Manual (Page 16)

DMX/DMXD/DMXH/DMXDH USER INSTRUCTIONS ENGLISH 85392728 - 10/09
Page 16 of 60
3.3.7 Throttling sleeve
Renewable type throttling sleeve is used under the
throttling bushing. The throttling sleeve is tubular,
keyed, has a shrink fit to the shaft, and is held in
position by a split ring.
3.3.8
Throttling bushing
Renewable type throttling bushing is used. It is held
in position by the raised annular ring of the bushing
engaging the annular groove in the casing. The
throttling bushing, in conjunction with the throttling
sleeve, allows pressure to be bled off through the
balance line, so that pressure on the Seal Chambers
is balanced. The throttling bushing also balances the
axial thrust of the pump rotor.
3.3.9
Crossover sleeve
A renewable type crossover sleeve under crossover
bushing is only used on double suction pumps
(DMXD/DMXDH). The crossover sleeve is tubular,
keyed, has a shrink fit to the shaft, and is held in
position by a split ring.
3.3.10 Crossover bushing
A renewable type crossover bushing is only used on
double suction pumps (DMXD/DMXDH). The
crossover bushing is horizontally split, and the two
halves are held together by taper dowel pins. It is
held in position by the raised annular ring of the
bushing engaging the annular groove in the casing.
The crossover bushing, in conjunction with crossover
sleeve, controls the leakage between the first and
second stage impellers.
3.3.11 Shaft
The high strength shaft is ground over its entire
length to close tolerances. The shaft is designed to
transmit the required power without vibration and is
stepped at each impeller fit for ease of assembly and
disassembly.
3.3.12 Bearings
The sleeve bearings are carbon steel backed, babbitt
lined, sleeve type insert bearings. The renewable
bearing inserts are mounted in bearing housings kept
from rotating by means of stop pins.
Each bearing is lubricated by an external pressure
supply system.
The thrust bearing is of the titling type with pads on
each side of the shaft mounted thrust
collar. It is capable of transmitting the thrust load in
either direction. It is lubricated from the
pressure lubrication system.
3.3.13 Seal Chambers
The Seal Chambers are cast integral with the casing.
Your pump is typically shipped with the mechanical
seal already installed.
The mechanical seal is designed to suit each
application. This creates the correct seal loading
face when seal gland is bolted in place.
Cartridge type mechanical seals are preset at the
seal manufacturer’s facility and require no field
settings. The seal installation should be checked
before startup.
Refer to the mechanical seal manufacturers drawing
and instructions found in section 8 of this manual for
detailed information.
3.4 Performance and operating limits
Refer to section 10.4 Customer Data Sheet.