Description

The EMAX ESP07V120V3PK-460 pairs a 7.5 HP, 31 CFM two-stage Silent Air compressor with a 58 CFM refrigerated air dryer, delivering clean, dry, shop-ready air from a single matched package. The compressor runs on 460V three-phase power and stores air in a 120-gallon vertical ASME-certified tank, while the dryer removes moisture and oil before the air reaches your tools and lines.

Because the dryer is rated at 58 CFM and the compressor delivers 31 CFM, the drying system carries well above the compressor's full output, so every cubic foot of air is dried even under continuous duty. The pump is a 100% cast iron, pressure-lubricated two-stage design with an estimated 70,000-hour pump life, and the unit is ETL-, ASME-, and CRN-certified.

Silent Air noise suppression

The patented Silent Air silencer targets intake noise, the loudest source of compressor sound, using noise-reducing baffle plates and high-capacity filter media. The result is up to 50% quieter operation, at or below conversational volume, without enclosing the pump in a cabinet that restricts service access. Each 10 dBA drop equals roughly a halving of perceived loudness to the human ear.

This package ships by freight on a crate measuring 48" x 46" x 87"; call MGS at 307-381-1810 to schedule delivery.

Features

Pressure-lubricated cast iron pump

A rear-mounted, automotive-style gear oil pump generates positive oil pressure and feeds every bearing point, keeping bearings cool and extending pump life. The crankshaft and connecting rods are rifle-drilled for direct oil flow to high-friction wear points, and a spin-on automotive-style oil filter keeps the oil clean between changes. A liquid-filled oil pressure gauge, a bleeder valve for quick priming, and an adjustable pressure regulator let operators monitor and tune oil pressure across the RPM range.

100% cast iron construction

All major components are cast iron, not aluminum: crankcase, cylinder heads, cylinders, connecting rods, crankshaft, and high-pressure piston. Cast iron holds rigidity and dimensional tolerance under high-duty-cycle compression where aluminum can flex and fail.

Cast iron cylinders and cylinder heads

The cylinders are CNC-machined for flatness and a concentric bore, with deep cooling fins and precision honing that reduce oil carryover and support long ring life. Solid cast iron heads use deep-bored, threaded holes for proper torque and a secure head-gasket seal, and the disc-valve design holds that seal without retorquing.

Piston, connecting rods, and four-ring sealing

Cast iron high-pressure pistons resist cylinder scoring under heavy loads, while CNC-machined solid cast iron connecting rods add rigidity at the crankshaft end. Replaceable bearing inserts and wrist pins make the rod assembly fully rebuildable rather than throw-away. The four-ring piston design uses two oil-control rings to scrape excess oil on the downstroke and two compression rings to seal against blow-by, minimizing oil carryover and extending ring life. On two-stage pumps, the low-pressure piston is aluminum for balance, as it operates under low stress.

Concentric ring disc valves

CNC-machined concentric ring (disc) valves are surface-ground for sealing and durability, and they service in minutes: remove the retainer, lift out the valve for inspection, and reinstall. All valves are engineered to accept an automatic head-unloader system, which is recommended for electric units running at 40% or greater duty cycle to reduce wear, save energy, and protect the motor and magnetic starter from repeated starting under load.

Cast iron flywheel and belt drive

The 7.5 HP unit uses a 20-inch cast iron flywheel with two B-groove belts and nine large cooling fins. The added mass stores kinetic energy to reduce amp draw, the wider belt contact area extends belt life, and the cooling fins pull air across the pump. A dual-bolt belt tensioner sets and holds proper belt tension without pry bars.

Pump riser, isolator pads, and continuous run

A pump mounting-plate riser lifts the pump for 360-degree airflow from the flywheel across the oil reservoir, improving cooling. Vibration isolator pads, a TEFC motor, and a magnetic starter round out a continuous-run-capable package rated at a 60% duty cycle.

Auto drain and refrigerated dryer

A dual-timer electric automatic drain expels moisture from the tank on an adjustable 1-to-45-minute cycle and includes an air muffler for quiet discharge. The matched 58 CFM refrigerated air dryer chills the compressed air to drop out moisture and uses a built-in coalescing filter to strip oil and solids into an automatic drain trap, then sends clean, dry air downstream. The dryer runs on R134A refrigerant and is rated for inlet air up to 140°F and ambient temperatures up to 122°F.

What's Included

• EMAX Silent Air 7.5 HP two-stage cast iron compressor on a 120-gallon vertical tank (ESP07V120V3-460)
• Magnetic motor starter
• Dual-bolt belt tensioner and pump-mounting riser
• Silent Air intake silencer with high-capacity filter media
• Dual-timer electric automatic tank drain with muffler
• Vibration isolator pads
• EMAX 58 CFM refrigerated air dryer with built-in coalescing filter and automatic drain (EDRCF1150058)

Specifications

Warranty

The compressor carries a 1-year standard warranty against defects in material, workmanship, and parts, including one year of labor from an authorized technician. Coverage extends to 5 years, and to a limited lifetime warranty on the pressure-lubricated pump, when the unit is registered in EMAX's SMART OIL maintenance program and the required oil and filter schedule is followed.

The refrigerated air dryer carries a 1-year standard warranty with one year of authorized labor, extendable to 3 years with registration, one annual dryer filter replacement kit, and the required maintenance. All units ship with break-in oil that must be changed within the first 70 hours. Warranties are non-transferable; see the warranty documents below for full terms.

FAQ

What electrical service does this compressor need?

It runs on 460V three-phase power on a recommended 20-amp breaker. Full-load current is 10.3 A and locked-rotor (peak starting) current is 66.2 A.

Is the dryer large enough for this compressor?

Yes. The dryer is rated at 58 CFM and the compressor delivers 31 CFM, so the dryer handles the full output with margin to spare.

Can it run continuously?

It is continuous-run capable at a 60% duty cycle, and its valves are engineered to accept an automatic head-unloader system for high-duty applications.

How do I get the 5-year or lifetime pump warranty?

Register the unit and enroll in EMAX's SMART OIL maintenance program, using approved oil and filters on the published schedule. The standard warranty is 1 year.

Documents

• Compressor Manual (PDF)
• Refrigerated Dryer Manual (PDF)
• Compressor Warranty (PDF)
• Dryer Warranty (PDF)