When unsurpassed performance and reliability are required, the PETStar-4 line of 4-Stage Reciprocating Air Compressors answers the challenge. Robustly designed and configured in a horizontally opposed cylinder configuration, the PETStar-4 arrangement virtually eliminates vibration with a minimal foundation requirement. By utilizing four stages of compression, the PETStar-4 is capable of providing unsurpassed compressor efficiency.
Lower stage compression ratios reduce the cylinder operating temperatures and extend the life of valves, rings and packing. To simplify installation, all PETStar-4 units feature a heavy duty welded steel sub base and are available with a matching air treatment component package. Whether you require a compressor for in-line molding or capacity to support a large production operation, there is a PETStar-4 package to meet your needs.
| Model | Frequency (Hz) | Rated Pressure (barg / psig) | Nominal Power (kW / hp) | Flow (m3min / cfm) |
| PS4-1500 | 50 | 260 / 350 | 25.5 / 900 | |
| PS4-1700 | 50 | 300 / 400 | 28.5 / 1006 | |
| PS4-1900 | 50 | 335 / 450 | 32.1 / 1132 | |
| PS4-2100 | 50 | 375 / 500 | 35.7 / 1262 | |
| PS4-2300 | 50 | 390 / 525 | 39.2 / 1386 | |
| PS4-2500 | 50 | 410 / 550 | 42.6 / 1503 | |
| PS4-2800 | 50 | 450 / 600 | 47.5 / 1678 | |
| PS4-3000 | 50 | 500 / 675 | 50.8 / 1793 | |
| PS4-3300 | 50 | 560 / 750 | 56.1 / 1982 |
Non lubricated 100% oil-free water-cooled design
Four-stage balanced opposed layout eliminates unwanted vibration
All double-acting, heavy-duty class-40 cast iron cylinder construction
Sleeve type main and connecting rod bearings
Endurable 16,000 hour rated piston rings & packing
Anticorrosion coating on all system air piping
Crankshaft-driven main oil pump
Electrical-driven prepublication system
Large cast-in water jackets for dimensional stability under extreme conditions
Conservatively designed valves selected to provide extra-long life
Lowest interstate temperatures and pressures
Intercoolers/after coolers selected for optimal 9°C(15°F) approach temperature
Distance pieces feature two compartments, ensuring lubricant is isolated from cylinders
Three-step capacity control 0%-50%100%
Advanced CMC main compressor controller with 1,000-event logging capability built-in
IP-55 TEFC, 6-pole main drive motor
Star-delta main motor starter
All components constructed in accordance with World Standards and stamped as applicable
Available in Basic or Intermediate package configuration with optional piped and mounted dryer and receiver
Available rod drop position wear indicators