3
Even with all these built-in features, you’ll still fi nd the 450XL to be
extremely cost-effi cient. This compressor has a whopping cylinder
displacement of 84,5 m
3
/h while running at 1200 RPM. And the
high isentropic effi ciency of the 450XL means its COP is second to
none when compared to other compression systems.
The 450XL can be installed almost anywhere, even on an upper
fl oor if necessary, since vibration is kept to a minimum. Noise level
is low too, due to the use of quickacting, precise ring plate suction
and discharge valves.
Far-Reaching Applications
The 450XL is so versatile it can handle almost any refrigeration
system conditions. Up to 24.1 bar maximum discharge, and up
to 10.3 bar maximum suction with a maximum 17.2 bar pressure
differential. At different compression ratios, too, from 8:1 for am-
monia to 14:1 for R404A. In V-belt confi gurations all the way up to
224 kW, or
direct drive setups up to 285 kW. And it’s usable for both 50Hz and
60Hz applications up to 1200 RPM.
The graph (Figure 2) on the next page depicts the broad range of
applications that the 450XL covers.
Compression and Oil Rings
The 450XL piston ring set consists of three compres-
sion rings and a single, special oil scraper ring for
keeping oil consumption to an absolute minimum.
Heavy-Duty Crankshaft*
An over-sized crankshaft pin diameter provides years
of rugged, dependable duty, while the larger bearing
surface allows for higher pressure differential capabi-
lities.
Connecting Rod Bearings*
Vilter’s unique oil circuit drilling arrangement ensures
proper hydrodynamic lubrication of insert bearings
throughout the entire compression process. Rod
bearings are specially designed to supply lubrication
to the piston pin bushing at all times.
Double Bellows Shaft Seal
The 450XL shaft seal, designed to specifi c Vilter
specifi cations, is manufactured from materials strictly
used for industrial refrigeration applications. Seal unit
assembly consists of two opposed seals – one sealing
from the atmosphere and the other from the crank-
case. Mating seal surfaces are lubricated and cooled
by circulated oil.
Single Casting Frame
The single casting frame incorporates suction and
discharge manifolds plus bearing supports. It’s cast to
exacting tolerances from a high grade of cast iron to
withstand extreme changes in heat and pressure. The
castings are notably free from porosity and internal
strains, and display excellent wearing qualities.
*Patented Design
