RIX 4VX SERIES - 40HP Helium compressor 60 scfm 50 psi to 3300 psi - (1 of 2)

What capacity and discharge pressure does it actually deliver?

This unit delivers 60 SCFM at 50 PSIG inlet to 3,300 PSIG discharge. The control panel includes automatic stop/restart with shutdown at 3,300 PSI and restart at 3,000 PSI. Four-stage compression steps through 140 / 400 / 1,300 / 3,300 PSIG interstage pressures with air-cooled heat exchangers maintaining approximately 20°F above ambient after each stage.

What drive, power and cooling does it require?

The unit includes a 40 HP motor operating at 250–750 RPM and is rated for 100% continuous duty. Cooling is air-cooled via heat exchangers on each of the four stages; no external water or glycol loop is required. The crankcase uses pressure lubrication with standard automotive engine oil, while the compression path itself is oil-free.

What are the running hours and what has been rebuilt?

The listing does not state running hours, service history, or rebuild status. For a used oil-free helium compressor, ask the seller for total hours, when rings and seals were last changed on each stage, and whether the crankcase bearings or valves have been serviced. High-pressure stages typically require more frequent attention than the suction and first stage.

What should I inspect on a used compressor before buying?

Verify operation of all safety interlocks—oil pressure (25 PSI shutdown), suction pressure (35 PSI stop), high gas temperature (450°F on 3rd stage, 390°F on 4th), and vibration switches. Check interstage pressures under load against the normal values listed (140 / 400 / 1,300 PSIG) to detect worn rings or leaking valves. Inspect the control panel, examine the crankcase for leaks or metal in the oil, and confirm relief valve settings match the specification (75 / 250 / 600 / 1,500 / 3,500 PSIG). On RIX four-stage units, excessive temperature rise across any stage or failure to reach rated discharge pressure typically indicates valve or piston ring wear.