EMAX Silent Air 7.5 HP 120-Gallon Single-Phase Two-Stage Vertical Air Compressor ESP07V120V1

The EMAX Silent Air ESP07V120V1 is a 7.5 HP, two-stage, single-phase stationary air compressor on a 120-gallon vertical tank, built for shops that run air all day and want to keep the noise down. It delivers 31 CFM and builds to a 175 PSI maximum, with 26 CFM still on tap at full 175 PSI pressure — enough to keep impact tools, sanders, and spray equipment moving without the pump cycling constantly.

What sets this unit apart is the Silent Air patented noise-suppression system. Instead of an enclosed cabinet that drives up cost and blocks service access, EMAX silences the loudest source of compressor noise — the air intake — with a serviceable silencer, noise-reducing baffle plates, and high-capacity filter media. The result runs up to 50% quieter, at or below normal conversational volume, while every component stays out in the open for routine maintenance.

Power comes from a 7.5 HP open drip-proof (ODP) motor wired for 230V single-phase service, paired with a magnetic starter so the unit drops onto common shop power without a phase converter. The pump is rated for continuous-run operation at a 60% duty cycle, and EMAX estimates 70,000 hours of pump life under proper maintenance.

Pressure-Lubricated Cast Iron Pump

Unlike splash-lubricated compressors, the ESP07V120V1 uses a gear-driven oil pump mounted to the rear of the crankshaft that pushes a continuous flow of oil to every bearing point. The crankshaft and connecting rods are rifle-drilled for direct oil delivery to high-friction wear points, an automotive-style spin-on oil filter keeps the oil clean, and a liquid-filled gauge lets the operator read oil pressure at a glance. The pump holds 2 quarts and runs on the APP4V1043TP pump assembly.

100% Cast Iron Construction

Every major component is cast iron rather than aluminum — the crankcase, cylinders, cylinder heads, connecting rods, crankshaft, and high-pressure piston. The cast iron cylinders are CNC-machined for a precise bore and concentricity that reduces oil carryover, with deep cooling fins that shed heat during high-duty-cycle runs.

The solid cast iron cylinder heads use deep-bored, threaded holes for solid head retention and proper torque, paired with a disc valve design that holds the head gasket seal without retorquing.

Cast Iron Flywheel

The 7.5 HP pump runs a 20-inch heavy-duty cast iron flywheel with two B-style groove belts and nine large cooling fins. The added mass stores kinetic energy to lower amp draw, the multi-belt contact surface extends belt life, and the cast fins pull cooling air across the pump.

Rebuildable Pistons and Connecting Rods

High-pressure pistons are cast iron to resist cylinder scoring under load, and the connecting rods are CNC-machined solid cast iron for rigidity at the crankshaft end where aluminum rods commonly fail. Replaceable bearing inserts and wrist pins make the rod assembly fully rebuildable rather than throw-away. The low-pressure pistons on this two-stage pump are aluminum, where loads are light (around 45 PSI).

The pump uses a four-ring piston design — two oil-control rings that scrape excess oil on the downstroke and two compression rings that seal against blow-by — to cut oil carryover and extend ring life. A rifle-drilled oil port carries oil up through the rod to the piston pin and bearing for continuous lubrication.

CNC-Machined Disc Valves

Precision surface-ground concentric ring (disc) valves seal better and last longer than the feather or reed valves used on many compressors, and they service in minutes — pull the retainer, lift the valve for inspection, and reinstall. Every head is engineered to support an automatic head unloader system for high-duty-cycle and continuous-run operation.

Dual-Bolt Belt Tensioner and Pump Riser

A dual-bolt belt tensioner makes belt adjustments precise and keeps the drive aligned at proper tension — no pry bars required — for longer belt life and easier service. A pump-mounting riser lifts the pump for 360-degree airflow off the flywheel, cooling the oil reservoir and pulling air underneath the pump.

Electric Auto Drain

A dual-timer electric auto drain expels moisture and water from the receiver tank automatically, with an adjustable interval from 1 to 45 minutes and a setting for how long the drain stays open. An included air muffler keeps the drain quiet when it discharges.

EMAX covers the ESP07V120V1 with a standard 1-year warranty on parts and labor from the date of delivery, with standard technical assistance provided at no charge during and after the warranty period. The warranty extends to a full 5 years when you register the compressor and maintain it with EMAX SMART OIL on the published maintenance schedule — break-in oil changed within 70 hours, then every 1,000 hours or 6 months.

The matching 5-Year Extended Warranty Kit (kit #EFKIT008AWBS) for 5–10 HP Silent Air electric models bundles the SMART OIL, filters, and service components required to qualify, and is sold separately.

What electrical service does it need?

The ESP07V120V1 runs on 230V single-phase power and draws 38.9 full-load amps with the 1.15 service factor. EMAX recommends a 50-amp breaker, and the unit ships with a magnetic starter — no phase converter or three-phase service required.

How quiet is it really?

The Silent Air silencer targets intake noise, the loudest part of a compressor, and brings the unit to at or below conversational volume — up to 50% quieter than a comparable open compressor — while keeping every component accessible for service.

Can it run continuously?

Yes. The pump is rated for continuous-run operation at a 60% duty cycle, and the heads are engineered to support an automatic head unloader for sustained high-duty-cycle use.

How is it delivered?

At 1,049 lbs and crated to 48" × 46" × 87", the compressor ships by freight on a solid oak pallet.

• Piston Compressor Manual
• Warranty Statement