EMAX 10 HP 120-Gallon Single-Phase Two-Stage Silent Air Vertical Air Compressor Package with 58 CFM Refrigerated Dryer ESP10V120V1PK

The EMAX ESP10V120V1PK is a 10 HP, two-stage piston air compressor on a 120-gallon vertical tank, packaged with a 58 CFM refrigerated air dryer as a complete air system. It delivers 38 CFM (34 CFM at its 175 PSI maximum) and runs on 230V single-phase power (±10%), so it does not require three-phase service. A magnetic starter, dual-bolt belt tensioner, electric auto tank drain, and isolator pads are part of the package.

This is a Silent Air model: EMAX's patented noise-suppression system runs up to 50% quieter than comparable compressors, holding noise at or near conversational volume. Unlike enclosed cabinet designs, the silencer doesn't restrict service access — the intake system pairs noise-reducing baffle plates with high-capacity filter media that EMAX rates at up to 1000% more filtration than standard setups.

The pressure-lubricated, 100% cast iron pump (model APP4V1043TP) carries an estimated 70,000-hour pump life, and the unit is ETL, ASME, and CRN certified. The standard 1-year warranty extends to 5 years — with a limited lifetime pump option — through EMAX's registration program (see Warranty below).

Pressure Lubrication

A gear-driven oil pump mounted to the rear of the crankshaft generates positive oil pressure, feeding every bearing point with a continuous flow of oil — the crankshaft and connecting rods are rifle-drilled so oil travels directly to the wrist pins and bearings. Unlike splash-lubricated systems, pressure lubrication puts oil precisely where it's needed in high-stress, continuous-duty operation. An automotive-style spin-on oil filter keeps the oil clean between changes, and a liquid-filled gauge with an adjustable regulator lets you monitor and set oil pressure accurately.

100% Cast Iron Pump

The crankcase, cylinders, cylinder heads, crankshaft, connecting rods, and high-pressure piston are all cast iron — no aluminum sleeves under the paint. Cast iron high-pressure pistons resist cylinder scoring under heavy load, and the CNC-machined solid cast iron connecting rods use replaceable bearing inserts and wrist pins, so the rod assembly is fully rebuildable rather than throw-away. Low-pressure pistons are aluminum by design — they operate around 45 PSI where the lighter material aids balance and efficiency.

The four-ring piston design overlaps two oil-control rings with two compression rings: the oil rings strip excess oil on the downstroke while the compression rings seal against blow-by. The result is less compression loss, less oil carryover, and longer ring life. Rifle-drilled oil ports in each rod carry oil from the crankshaft up to the piston pin and bearing.

Disc Valves and Cast Iron Heads

CNC-machined concentric ring (disc) valves are precision surface-ground for sealing and service life — significantly more reliable than feather or fixed reed valves, and serviceable in minutes: remove the retainer, lift out the valve, inspect, reinstall. The solid cast iron heads use tapped holes for head retention and hold a head gasket seal without retorquing.

The cylinders are CNC-machined and precision-honed for concentricity, with deep cooling fins that maximize surface area under high-duty-cycle operation. Deep-bored, threaded holes allow proper torque application for long-term gasket durability.

Continuous Run with Head Unloader

This unit is continuous-run capable at a 60% duty cycle. When tank pressure reaches the preset maximum, the pilot valve unloads the compressor — holding the intake valve open so the motor keeps running instead of repeatedly starting under load. That cuts amp draw by up to 60% while unloaded, circulates cool air through the cylinders, and protects the motor and magnetic starter from start-stop wear. For duty cycles over 40%, a ball valve connected to the pilot valve can be opened for continuous-run operation.

Heavy Cast Iron Flywheel and Belt Drive

The 10 HP pump runs a 20-inch cast iron flywheel with two B-style groove belts and nine large cooling fins. The flywheel's mass builds kinetic energy that reduces amp draw, while the multi-belt B-width drive provides more grip surface at lower belt tension than narrow single A-width belts — less strain on motor and pump bearings, less noise, and longer belt life. The dual-bolt belt tensioner sets alignment and tension precisely, with no pry bar required.

Pump Riser, Auto Drain, and Dryer

A pump mounting riser lifts the pump for 360-degree airflow from the flywheel across the oil reservoir and under the pump for maximum cooling. The dual-timer electric auto drain expels tank moisture on adjustable cycles from 1 to 45 minutes — with adjustable open duration — and includes an air muffler for quiet discharge. The included 58 CFM refrigerated air dryer removes moisture from the compressed air and has a built-in .001-micron prefilter plus a .005-micron coalescing prefilter.

• EMAX 10 HP two-stage Silent Air vertical air compressor, 120-gallon tank (ESP10V120V1PK)
• 58 CFM refrigerated air dryer with built-in prefilters
• Magnetic starter
• Dual-bolt belt tensioner
• Dual-timer electric auto tank drain with muffler
• Isolator pads
• Continuous-run head unloader with pilot valve

EMAX covers the compressor with a 1-year standard warranty against defects in material, workmanship, and parts, including one year of warranty labor from an authorized technician. Registering at emaxwarranty.com and following EMAX's maintenance schedule with their SMART OIL extends coverage to a full 5 years — and participation in the SMART OIL auto-ship program upgrades the pressure-lubricated pump to a limited lifetime pump warranty (non-prorated, no hour limits), with all other non-wear components covered for 5 years.

The refrigerated dryer carries its own 1-year standard warranty, extendable to 3 years with registration and one Airbase dryer filter replacement kit per year. The EMAX 5-Year Extended Warranty Kit (EFKIT008AWBS, sold separately) covers the startup and scheduled-maintenance components for 5–10 HP Silent Air electric models: change the break-in oil within the first 70 hours, then every 6 months or 1,000 hours using EMAX-approved oil.

What electrical service does it need?

230V single-phase (±10%) with a recommended 60 A breaker. Full load amps are 52.9 with the 1.15 service factor; plan for 270 A peak starting amps. No three-phase service required.

Can it run all day?

Yes. The continuous-run head unloader lets the motor keep running unloaded at max tank pressure instead of cycling on and off. For applications over a 40% duty cycle, open the ball valve on the pilot valve for continuous-run operation.

Is the air dryer included?

Yes — the package ships with a 58 CFM refrigerated air dryer with a built-in .001-micron prefilter and .005-micron coalescing prefilter, sized as a complete air system for this compressor.

What maintenance does the warranty require?

Change the break-in oil within the first 70 hours, then every 6 months or 1,000 hours (whichever comes first) using EMAX-approved oil, and keep the oil level correct. Registration at emaxwarranty.com is required for the extended warranty tiers; the EFKIT008AWBS service kit bundles the required components for 5–10 HP Silent Air models.

• Piston Compressor Manual
• Refrigerated Air Dryer Manual
• Compressor Warranty Statement
• Air Dryer Warranty Statement