Emerson 450XL User Manual

Vilter 450 XL® Compressor

For Industrial Refrigeration

450XL Cross Section

Spring Loaded Safety Heads

Protect against liquid slugging by relieving internal
cylinder pressure if cylinders are subjected to an
incompressible fl uid.

Suction and Discharge Porting

Maximum suction and discharge porting through the
compressor achieves minimum pressure drop with
valve plates that are made to exacting Vilter material
and manufacturing requirements for long-term
service.

Piston and Connecting Rod

The unique design of the piston and connecting rod
assembly allows for movement only between the con­necting rod bushing and piston pin, while providing
positive lubrication throughout the entire compres­sion cycle.

Double Tapered Roller Bearings

Energy-effi cient roller bearings enable the compressor
to be used for high suction pressure applications as
well as high belt-drive horsepower requirements.

Tri-Micro® Oil Filter

Removes 95% of contaminants as small as 3 microns
in size. Allows full fl ow of oil at all times, resulting in
reduced wear on compressor components. Combines
extreme fi ltering capacity with the convenience of a
throw-away recharge element. Filter is enclosed in a
seamless drawn carbon steel shell with cast iron cover,
and is equipped with a means for determining pres­sure drop across the fi lter.

The versatile VMC 450XL is now even better!

While retaining all of the features that are exclusive to Vilter com­pressors, we’ve made several design improvements:

• Piston

• Connecting road and bearing insert

• Crankshaft

• Safety head

• Capacity reduction system

Even though we’ve made these specifi c changes, we’ve retained
all of the exclusive Vilter features, including provisions for fast and
easy servicing with components that are easy to access.

The 450XL can operate with ammonia, halocarbon and even some
hydrocarbon refrigerants. It works in extreme applications with up
to a 17,2 bar pressure differential. It can be belt-driven up to 224
kW or direct driven all the way up to 285 kW. And it can run at high
compression ratios all the way up to 12:1 with certain halocarbon
refrigerants.

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Compression and Oil Rings

The 450XL piston ring set consists of three compres­sion 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 capabi­lities.

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 crank­case. Mating seal surfaces are lubricated and cooled
by circulated oil.

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.

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

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 am­monia 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.

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