RKA35G42N-BB 3.5 GPM 4200 PSI | Brass Head Triplex

RKA35G42N-BB Triplex Plunger Pump

The Annovi Reverberi RKA35G42N-BB is a commercial-duty triplex plunger pump engineered
for systems that require high pressure at a controlled, slow-speed RPM. Delivering
3.5 GPM at up to 4,200 PSI while operating at 1,750 RPM, this model is designed
to provide strong cutting force and reliable duty-cycle performance without the heat and
mechanical stress typically associated with high-speed direct-drive pumps.

This performance profile makes the RKA35G42N-BB an excellent choice for contractors,
facilities, and OEM builders who need a pressure-focused pump for surface preparation,
industrial cleaning, equipment washdown, and specialty applications where pressure matters
more than volume. The brass manifold head provides corrosion resistance and structural
stability under repeated pressure cycling, while the triplex plunger architecture delivers
smoother output and lower pulsation than many alternative pump designs.

• High-pressure duty point: 4,200 PSI supports demanding cleaning and prep work.
• Controlled flow: 3.5 GPM maintains efficiency and helps manage water usage.
• Slow-speed reliability: 1,750 RPM reduces vibration, heat, and wear.
• Commercial build intent: Designed for daily operation in professional systems.

Performance & Operating Profile

The RKA35G42N-BB is optimized for applications that need pressure-driven results—the kind
of work where you are stripping, cutting, or lifting stubborn contamination from durable
surfaces. At 4,200 PSI, the pump produces strong impact energy at the nozzle, improving the
ability to remove layered grime, oxidation, and embedded soils. At the same time, the 3.5 GPM
flow rate supports efficient rinsing, manageable water consumption, and compatibility with a
wide range of hose sizes, guns, swivels, and accessories commonly used in contractor and
facility maintenance environments.

• Best fit for: high-pressure cleaning, surface preparation, and heavy soil removal.
• Balanced efficiency: 3.5 GPM avoids excessive water demand while maintaining practical rinse speed.
• Reduced stress: slow-speed operation helps extend seal, valve, and bearing life.
• System control: works well with unloaders and regulators set up for stable bypass behavior.

Key Specifications

• Model: RKA35G42N-BB
• Pump Type: Triplex plunger
• Flow Rate: 3.5 GPM
• Maximum Pressure: 4,200 PSI
• Operating Speed: 1,750 RPM
• Head Material: Brass manifold
• Orientation: Horizontal (system dependent)
• Operating Intent: Commercial / professional duty

Triplex Plunger Output Stability

Triplex plunger pumps are widely used in commercial pressure washer systems because they
deliver strong pressure with a smoother hydraulic signature than many other pump types.
The RKA35G42N-BB uses three plungers operating in phased cycles to provide reduced pulsation,
more consistent spray patterns, and improved stability at the gun. This matters in real use
because it helps reduce fatigue, improves rinse uniformity, and protects downstream components
from pressure spikes.

• Smoother output helps reduce vibration in hose, gun, and lance assemblies.
• Reduced pulsation supports steadier unloader performance and less “chatter” in bypass.
• More consistent pressure improves nozzle behavior for surface cleaning and rinsing.
• Lower system shock helps extend the life of hoses, fittings, and gauges.

Brass Head Durability

The brass manifold head is a key feature of the RKA35G42N-BB. Brass provides an excellent balance
of corrosion resistance and structural stability for pressure washer duty. In real-world work,
pumps often face mineral-rich water, detergents, and frequent thermal cycling. A brass head helps
maintain sealing surfaces and port geometry over time, supporting longer service intervals and
more predictable performance.

• Brass manifold supports corrosion resistance for standard detergents and wash chemicals.
• Dimensional stability helps maintain sealing performance under repeated pressure cycles.
• Structural strength supports high-pressure operation with reduced fatigue risk.
• Service-friendly layout supports routine seal and valve service when required.

Drive Strategy & Integration (1,750 RPM Systems)

Because the pump is designed to operate at 1,750 RPM, it is commonly paired with belt-drive,
gear-drive, or appropriately matched motor/drive arrangements that maintain this operating speed.
This is a major advantage for longevity: slow-speed operation reduces the rate of wear on packings,
valves, plungers, and bearings, and it helps keep oil temperature more stable during extended runtime.
For system builders, this also improves reliability in mobile rigs and fixed wash stations where
maintenance cycles must be predictable.

• Ideal for belt-drive or gear-drive systems that maintain controlled pump RPM.
• Slow-speed duty reduces heat rise during long cleaning sessions.
• Improves seal life by lowering friction and thermal load at the packing stack.
• Supports stable operation in continuous-duty or frequent-cycle environments.

Installation & Plumbing Considerations

Proper installation is critical for any high-pressure pump, especially at 4,200 PSI. The inlet side must
be supplied with clean, adequately sized plumbing to protect the pump from cavitation and debris-related
valve damage. On the discharge side, the system must use properly rated components—hose, gun, lance,
swivels, gauges, and unloaders—to safely handle operating pressure and temperature. A correctly sized
unloader or regulator is essential for stable bypass operation and consistent spray performance.

• Use filtered, debris-free water to protect valves and sealing surfaces.
• Keep inlet plumbing short, straight, and full-bore to protect NPSH margin.
• Use rated high-pressure accessories appropriate for 4,200 PSI service.
• Include a thermal relief valve in bypass to limit temperature rise during recirculation.
• Verify nozzle sizing to keep operating pressure within system limits.

Typical Applications

The RKA35G42N-BB is a strong fit for pressure-driven cleaning and preparation work where higher PSI improves
results. Its 3.5 GPM flow supports practical rinsing while the 4,200 PSI rating provides the cutting action
needed for demanding surfaces and stubborn contamination.

• Surface preparation: paint prep, coating lift, and heavy grime removal on concrete and steel.
• Contractor work: mobile rigs performing high-pressure cleaning and restoration jobs.
• Equipment washdown: construction and industrial equipment cleaning where pressure is required.
• Facilities maintenance: docks, service bays, and plant areas needing periodic high-pressure cleaning.
• Fleet support: wheels, undercarriages, and stubborn road film where pressure improves efficiency.

Why Choose the RKA35G42N-BB

For operators who need higher pressure without sacrificing durability, the RKA35G42N-BB delivers a practical
combination of output, materials, and slow-speed reliability. It is built to perform in professional-duty systems
where downtime is expensive and consistent results matter.

• High-pressure 4,200 PSI output for demanding cleaning and prep work.
• Slow-speed 1,750 RPM design for longer component life and reduced thermal stress.
• Triplex plunger architecture for smooth flow and stable pressure delivery.
• Brass manifold head for durability and corrosion resistance.
• Commercial-duty foundation for contractor rigs and facility systems.

Conclusion

The Annovi Reverberi RKA35G42N-BB is a commercial-grade triplex plunger pump delivering
3.5 GPM at 4,200 PSI at a controlled 1,750 RPM. Built around a durable brass head and
a pressure-focused performance profile, it is an excellent solution for high-pressure cleaning,
surface preparation, and demanding contractor or facility maintenance work. When installed with
proper inlet supply, correct accessory ratings, and stable drive control, this pump provides
reliable performance, predictable maintenance, and long-term value in professional cleaning systems.