EMAX EP10DW120V1 NEMA4 Compliant Weather-Resistant Duplex 10HP Air Compressor, 76 CFM, 230V 1-Phase, 120-Gal Horizontal Tank with Alternating Switch

The EMAX EP10DW120V1 is a NEMA4-compliant, weather-resistant duplex piston air compressor with an alternating switch. It is rated at 10 HP and 76 CFM, runs on 230V single-phase power, and is mounted on a 120-gallon horizontal tank. Its two-stage, pressure-lubricated, cast iron pump design is built for high-stress, continuous-duty environments where reliability and long service life matter.

Duplex Package & Electrical

• Duplex Configuration: Duplex compressor package with an alternating switch, mounted on a 120-gallon horizontal tank.

• Weather-Resistant Design: NEMA4-compliant, weather-resistant construction.

• Power: 10 HP, 230V single-phase electric drive with an ODP motor and magnetic starter.

• Package Features: Automatic tank drain, pump riser, belt tensioner, four-belt drive, and a 1" outlet.

Pressure Lubrication System

• Gear-Driven Oil Pump: Mounted to the rear of the crankshaft, it generates positive oil pressure and delivers a continuous flow of oil to each bearing point. This reduces friction, wear, and heat and keeps bearings cool.

• Rifle-Drilled Passages: The crankshaft and connecting rods are rifle-drilled for direct oil flow to bearings, the piston pin, and other high-friction wear points.

• Spin-On Oil Filter: An automotive-style spin-on filter keeps oil clean and simplifies maintenance during oil changes.

• Analog Oil Pressure Gauge: Lets operators monitor oil pressure accurately.

• Advantage Over Splash Lubrication: Oil is delivered precisely where it's needed, especially in high-stress, continuous-duty environments.

Cast Iron Pump Construction

• Cast Iron Major Components: The crankcase, cylinder heads, cylinders, connecting rods, crankshaft, and high-pressure piston are constructed from cast iron for durability and rigidity.

• Cast Iron High-Pressure Pistons: Designed to withstand heavy loads and help prevent cylinder scoring and pump failure.

• Low-Pressure Pistons: On two-stage pumps, the low-pressure pistons are aluminum for balance and efficiency, since they operate under low stress (~45 PSI).

• CNC-Machined Connecting Rods: Solid cast iron rods maintain strength at the base and at the crankshaft end, where aluminum rods commonly fail.

• Fully Rebuildable: Replaceable bearing inserts and wrist pins allow the connecting rod assembly to be rebuilt rather than thrown away.

Sealing & Valve Technology

• Four-Ring Piston Design: Two oil control rings remove excess oil on the downstroke, and two overlapping compression rings seal under compression to prevent blow-by. This reduces oil carryover and extends ring life.

• Non-Oil-Absorbent Gaskets: High-quality gaskets minimize oil leakage and reduce maintenance requirements.

• CNC-Machined Disc Valves: Precision surface-ground concentric ring valves provide superior sealing and longer service life than feather or reed valves.

• Quick Valve Service: Remove the retainer, lift out the valve for inspection, and reinstall it within minutes.

• Head Unloader Ready: All valves are engineered to support an automatic head unloader system. Head unloaders relieve the intake valve during constant-run operation, improving pump cooling and reducing wear.

Heavy-Duty Flywheel

• Cast Iron Flywheel: The increased mass generates greater kinetic energy, reducing amp draw and lowering overall energy consumption.

• 10 HP Flywheel Specs: 20" flywheel with (2) B-style groove belts and 9 large cooling fins, per the manufacturer's 7.5/10 HP pump specifications.

• Belt Life & Cooling: Multiple B-groove belts provide a larger contact surface to extend belt life, and optimized cooling fins enhance pump cooling capacity.

Need help confirming that the EP10DW120V1 is the right fit for your air demand and electrical setup? Call Pittsburgh Spray Equipment at 888-714-1410 for compressor sizing help.

Specifications — EP10DW120V1