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 fluid.
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-efficient 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 flow of oil at all times, resulting in reduced wear on compressor components. Combines extreme filtering 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 filter.
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 specific 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 specific Vilter specifications, 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.
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
Even with all these built-in features, you’ll still find the 450XL to be extremely cost-efficient. This compressor has a whopping cylinder displacement of 84,5 m3/h while running at 1200 RPM. And the high isentropic efficiency 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 floor 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 configurations 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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