RKA35G40HN 3.5 GPM 4000 PSI | Industrial Triplex Pump

RKA35G40HN — 3.5 GPM 4,000 PSI Triplex Plunger Pump, 1,750 RPM

Overview

The Annovi Reverberi RKA35G40HN is an industrial-duty triplex plunger pump built for
high-pressure cleaning systems that demand dependable performance, long service life, and
predictable maintenance. Producing 3.5 GPM at up to 4,000 PSI while operating at a
controlled 1,750 RPM, this model is designed for professional-duty work where
pressure-driven cleaning results matter, but reliability and heat management are just as important.

The 1,750 RPM operating profile is a major advantage for commercial and industrial users. Compared
to high-speed direct-drive pumps, slow-speed operation reduces friction, lowers oil temperature
rise, and minimizes stress on bearings, valves, and seal stacks. The result is a pump that is
well suited for daily operation in fleet bays, industrial wash stations, equipment maintenance
programs, and contractor rigs where downtime is expensive.

• Pressure-focused output: 4,000 PSI for demanding cleaning and surface preparation tasks.
• Practical flow rate: 3.5 GPM supports efficient rinsing without excessive water demand.
• Slow-speed durability: 1,750 RPM reduces heat, vibration, and component fatigue.
• Industrial intent: Designed for continuous-use commercial and industrial environments.

Performance & Effective Cleaning Output

With an ECU rating of approximately 14,000 (GPM × PSI), the RKA35G40HN sits in a performance
range that delivers strong impact energy at the nozzle while still providing enough flow for practical
rinsing. This combination is ideal for contractors and facilities that need pressure to cut through
baked-on soils, heavy film, and embedded contamination on durable surfaces such as concrete, steel,
and heavy equipment.

At 3.5 GPM, the pump supports a wide variety of nozzle and accessory configurations, including long hose
runs commonly found in wash bays and mobile skids. The 4,000 PSI pressure ceiling also provides headroom
for tuning working pressure to the job, allowing operators to run lower PSI for controlled cleaning or
increase pressure for more aggressive surface prep as required by the system setup.

• High-pressure cleaning: strong cutting action for stubborn soils and surface prep.
• Stable performance: triplex output supports consistent spray behavior under load.
• System flexibility: compatible with common commercial accessories sized for 4,000 PSI service.
• Efficient operation: slow-speed duty helps maintain cooler running during long cycles.

Key Specifications

• Model: RKA35G40HN
• Pump Type: Triplex plunger
• Flow Rate: 3.5 GPM
• Maximum Pressure: 4,000 PSI
• Operating Speed: 1,750 RPM
• ECU Rating: 14,000
• Duty Intent: Commercial / industrial continuous-duty cleaning
• Warranty: 5-year manufacturer coverage

Triplex Plunger Design & Output Stability

Triplex plunger pumps are the standard for professional pressure washer systems because they deliver
high pressure with reduced pulsation. The RKA35G40HN uses three plungers operating in phased cycles to
produce smoother output at the nozzle and reduced vibration at the gun. This matters in real-world
use because it improves operator control, supports more stable unloader behavior, and helps protect
hoses, fittings, and gauges from pressure spikes.

• Reduced pulsation supports steadier spray patterns and more predictable cleaning results.
• Smoother hydraulics help minimize unloader chatter and bypass instability.
• Lower vibration reduces fatigue and helps extend accessory life.
• Triplex design supports high-pressure operation without harsh pressure fluctuations.

Durability & Materials Package

The RKA35G40HN is built for durability in demanding environments. High-pressure pumps live and die by
their ability to manage heat, resist wear, and maintain sealing surfaces under repeated cycles. This
model is engineered with a professional materials package intended to support long runtime intervals
when paired with proper filtration, correct inlet supply, and correctly sized unloaders and nozzles.

• Ceramic plungers provide excellent abrasion resistance and reduced heat transfer into packings.
• Stainless steel valves resist corrosion and maintain reliable sealing through repeated cycles.
• Heavy-duty crankcase architecture supports stability under high-pressure loading.
• Slow-speed operation reduces internal stress, supporting longer seal and bearing life.

What’s Included with RKA35G40HN

• Factory-filled crankcase with break-in oil for safe startup.
• Oil sight glass for quick oil-level and condition checks.
• Vented dipstick for crankcase ventilation and routine servicing.
• Operation manual and parts breakdown schematic for service reference.

Installation & System Integration Guidance

Because the pump is designed for 1,750 RPM operation, it is typically integrated into systems using
belt drive, gear drive, or appropriately matched motor/drive packages that hold the correct pump speed.
The goal is stable RPM under load, proper inlet supply, and safe pressure regulation. For best results,
use full-bore inlet plumbing, clean filtration, and high-pressure components rated for the system’s
maximum pressure.

• Maintain correct pump RPM using stable drive ratios and properly sized motors.
• Use clean, filtered water to protect valves and sealing surfaces from debris damage.
• Keep inlet plumbing short, straight, and full-bore to minimize restriction and cavitation risk.
• Select unloaders, regulators, hoses, guns, and swivels rated for 4,000 PSI service.
• Include a thermal relief valve in bypass to limit temperature rise during recirculation.

Typical Applications

The RKA35G40HN is designed for pressure-driven cleaning in professional environments. It is commonly
used in applications where 4,000 PSI improves results on durable surfaces, while 3.5 GPM supports
practical rinsing and manageable water consumption.

• Concrete and hard-surface cleaning: sidewalks, loading pads, docks, and service bays.
• Fleet and vehicle washing: heavy vehicles, undercarriages, wheels, and equipment frames.
• Construction and agricultural maintenance: machinery washdown and jobsite cleanup.
• Industrial facilities: plant maintenance, equipment cleaning, and wash stations.
• Commercial property cleaning: exterior surfaces and routine maintenance programs.

Why Choose the RKA35G40HN

For commercial operators who need high-pressure performance without sacrificing durability, the
RKA35G40HN delivers a balanced output and a slow-speed design that supports longer service life.
It is a practical foundation for professional cleaning systems where uptime and predictable
maintenance matter.

• 4,000 PSI output for demanding cleaning and surface preparation.
• Slow-speed 1,750 RPM duty profile for reduced heat and longer component life.
• Triplex plunger architecture for smooth, stable pressure delivery.
• Service-friendly features to support routine inspections and planned maintenance.
• Strong fit for contractor, industrial, and commercial-duty pressure washer builds.