RKV4G35HDF24C1I 4.0 GPM 3500 PSI Triplex Pump | 3400 RPM

RKV4G35HDF24C1 by Annovi Reverberi — RK Series Heavy-Duty Triplex Plunger Pump with Gymatic VR35 Unloader | 4.0 GPM | 3,500 PSI | Bronze Connecting Rods | Reinforced Crankcase | 1″ Hollow Keyway Shaft | SAE J609A Gas and Diesel Engine Drive | No Chemical Injector

The RKV4G35HDF24C1 by Annovi Reverberi is a professional-grade RK Series heavy-duty triplex ceramic plunger pump engineered for gas and diesel engine-driven commercial and industrial pressure washing systems requiring 4.0 GPM high-volume output at 3,500 PSI with dependable Gymatic VR35 bypass pressure regulation and straight high-pressure water delivery. Rated at 4.0 GPM and 3,500 PSI at 3,400 RPM, the RKV4G35HDF24C1 delivers 14,000 cleaning units through a reinforced heavy-duty crankcase with bronze connecting rods, solid ceramic plungers, and an F24 SAE J609A direct-drive flange for close-coupling to gasoline or diesel engines.

The RKV4G35HDF24C1 carries the C1 unloader designation — confirming the Gymatic VR35, AR’s elevated-capacity Gymatic variant rated to 4,000 PSI and 5 GPM. At 3,500 PSI the VR35 operates with 500 PSI of comfortable headroom — the most favorable unloader margin available in the RKV 3,500 PSI family. This substantial headroom delivers stable, confident bypass regulation and extended unloader service intervals in high-cycle commercial environments. The HD (Heavy Duty) designation confirms the elevated construction standard: reinforced crankcase and bronze connecting rods for continuous commercial duty. No chemical injector — straight high-pressure water output for operators managing chemical delivery through an external system.

Built by Annovi Reverberi in Modena, Italy — with US-based operations, a domestic parts distribution network, and dedicated AR North America technical support — the RKV4G35HDF24C1 arrives as a complete, factory-tested assembly. Pre-filled with AR break-in oil, equipped with a Gymatic VR35 unloader, and packaged with mounting bolts and fasteners, a vented dipstick, operator’s manual, and full parts schematic, this pump is ready to install from the moment it arrives. Protected by a 5-year US limited warranty through AR North America and built to be fully rebuilt rather than replaced, the RKV4G35HDF24C1 is a long-term investment in a high-output RK Series commercial pump platform capable of a decade of productive service life.

Decoding the RKV4G35HDF24C1 Model Number

What Every Segment of This AR Pump Designation Tells You

• RKV — Pump series: RK Series triplex plunger pump — AR’s industrial pump platform with reinforced crankcase and front-access piston packing and valve serviceability
• 4G35 — Performance rating: 4.0 GPM flow rate at 3,500 PSI maximum operating pressure — 14,000 cleaning units
• HD — Heavy Duty specification: reinforced crankcase and bronze connecting rods for high-output continuous commercial duty
• F24 — Flange type: SAE J609A direct-drive flange for RK Series ‘D’ version pumps — close coupling to gas or diesel engines with a 1″ I.D. cylindrical shaft (AR part AR41866)
• C1 — Unloader variant: Gymatic VR35 — AR’s elevated-capacity Gymatic unloader family rated to 4,000 PSI and 5 GPM. At 3,500 PSI the VR35 provides 500 PSI of operating headroom — the most favorable margin available in the RKV 3,500 PSI family, delivering stable bypass regulation well within the VR35’s design envelope. Unloader part reference: AR22287 (adjustable, 2.0 injector ratio, 4,000 PSI, 5 GPM, 1/2″ M inlet, 3/8″ M outlet, brass body).
• No trailing I suffix — the model terminates at C1, confirming straight 3,500 PSI water output without an integrated downstream chemical injector

RKV4G35HDF24C1 — The VR35 HD Configuration at 3,500 PSI

The RKV 4.0 GPM / 3,500 PSI HD non-injector family now includes two configurations:

• RKV4G35HDF24C1 (this model) — Gymatic VR35 (C1), rated 4,000 PSI, 500 PSI operating headroom at 3,500 PSI. HD reinforced crankcase and bronze connecting rods. No injector. The preferred unloader specification at this pressure point for maximum bypass regulation stability and longest unloader service intervals.
• RKV4G35HD-F24C2 — Gymatic 3/B (C2), rated 3,650 PSI, 150 PSI operating headroom at 3,500 PSI. HD reinforced crankcase and bronze connecting rods. No injector.

The RKV4G35HDF24C1’s 500 PSI VR35 headroom provides a clear engineering advantage over the C2’s 150 PSI margin at 3,500 PSI — more stable bypass regulation, lower cumulative stress on unloader bypass components, and longer rebuild intervals in high-cycle production environments.

Key Specifications

RKV4G35HDF24C1 Technical Details at a Glance

• Flow Rate: 4.0 GPM (gallons per minute)
• Maximum Pressure: 3,500 PSI
• Cleaning Units: 14,000 (GPM × PSI)
• Operating Speed: 3,400 RPM
• Pump Type: RK Series heavy-duty triplex ceramic plunger pump — three-piston crankshaft-driven design for smooth, consistent high-pressure output
• Build Specification: HD (Heavy Duty) — reinforced crankcase and bronze connecting rods
• Crankshaft Bore: 1″ hollow keyway — direct engagement with gas or diesel engine 1″ output shaft
• Crankcase: Reinforced (HD) — heavy-duty construction for continuous commercial duty
• Manifold Material: Forged brass — dense, pore-free construction for corrosion resistance and sustained 3,500 PSI cycle integrity
• Plungers: Solid ceramic — exceptional hardness, wear resistance, and thermal shock resistance across extended commercial operating hours
• Connecting Rods: Bronze (HD) — premium fatigue strength and wear resistance at 4.0 GPM / 3,500 PSI continuous duty cycles
• Valves: Stainless steel — precise seating geometry, scale resistance, and reliable performance under continuous cycling
• Serviceability: Front-access piston packings and valve assemblies for simplified field maintenance
• Lubrication: Oil-bath crankcase lubrication with vented dipstick and sight glass
• Flange: F24 — SAE J609A direct-drive flange, RK Series ‘D’ version, 1″ shaft, gas and diesel engine compatible (AR part AR41866)
• Unloader System: Gymatic VR35 (C1 code) — brass-body internal bypass unloader, adjustable pressure regulation, rated to 4,000 PSI and 5 GPM; 500 PSI operating headroom above 3,500 PSI output
• Unloader Part Reference: AR22287 — adjustable Gymatic VR35, 2.0 injector ratio, 1/2″ M inlet, 3/8″ M outlet, brass body
• Chemical Injector: Not included — model terminates at C1 with no injector suffix
• Warranty: 5-year limited warranty — US-based coverage through AR North America

What’s Included in the Box

A Complete, Factory-Configured RKV4G35HDF24C1 Assembly Ready for Installation

• Factory-installed Gymatic VR35 unloader (C1, AR22287) — pre-mounted and calibrated; no downstream injector port on this RKV4G35HDF24C1 variant
• AR factory break-in oil — crankcase pre-filled to the correct operating level for first startup
• Vented dipstick — fast, accurate crankcase oil level checks with proper crankcase pressure relief
• Clear oil sight glass — at-a-glance visual verification of crankcase lubrication level
• Mounting bolts and fasteners — hardware sized for F24 SAE J609A direct-drive flange installation on compatible 1″ shaft gas or diesel engines
• Operator’s manual — complete installation, startup, operating, and maintenance procedures for the RKV4G35HDF24C1 including oil change intervals, packing and valve service guidance, and winterization protocol
• Parts schematic — exploded-view diagram with AR part numbers for every serviceable RKV4G35HDF24C1 component
• Factory test certification — every RKV4G35HDF24C1 load-tested at 50%, 100%, and 150% of rated output before leaving the AR manufacturing facility

HD Heavy Duty Construction — Reinforced Crankcase and Bronze Connecting Rods

Built for High-Output Continuous Commercial Duty at 3,500 PSI

Reinforced Crankcase

• Structural rigidity under sustained load — the reinforced crankcase handles the combined mechanical forces of 4.0 GPM and 3,500 PSI at 3,400 RPM, maintaining crankshaft and bearing alignment under vibration and thermal expansion cycles during continuous duty operation on the RKV4G35HDF24C1
• Stable alignment for extended packing life — reinforced construction maintains plunger bore alignment across high-cycle commercial operation, extending the service interval between packing replacements
• Heat management — appropriate thermal dissipation keeps operating temperatures at bearing and seal interfaces within design limits during continuous high-RPM operation

Bronze Connecting Rods

• Fatigue strength at continuous duty — bronze connecting rods on the RKV4G35HDF24C1 resist the repeated load cycling of 4.0 GPM / 3,500 PSI operation, distributing force evenly across the crankshaft and extending connecting rod service life in high-cycle commercial environments
• Wear resistance at bearing interfaces — bronze’s tribological properties reduce wear at connecting rod bearing surfaces under the sustained load conditions of continuous commercial operation

The Gymatic VR35 at 3,500 PSI — 500 PSI Headroom. Maximum Stability.

The Preferred Unloader Specification at This Pressure Point.

The Gymatic VR35 unloader (AR22287) on the RKV4G35HDF24C1 is rated to 4,000 PSI and 5 GPM — providing 500 PSI of operating headroom above 3,500 PSI. This margin is the largest available in the RKV 3,500 PSI family and produces the most stable, service-life-extending bypass regulation at this pressure point:

• 500 PSI — the most favorable headroom at 3,500 PSI — the VR35 at 3,500 PSI operates well below its rated ceiling, producing stable, confident bypass regulation throughout the RKV4G35HDF24C1’s full operating range. Bypass transitions are smooth and consistent, protecting hoses, spray guns, and downstream accessories from pressure spikes at every trigger release.
• Extended unloader service life vs C2 at this pressure — the VR35’s 500 PSI headroom at 3,500 PSI produces substantially less cumulative stress on bypass valve components than configurations operating closer to the rated ceiling, extending the rebuild interval on the RKV4G35HDF24C1 in high-cycle production environments
• Adjustable then tamper-resistant — operating pressure set on-site and locked before production, maintained consistently across every operator and every job cycle without re-adjustment or drift
• Smooth internal bypass at 4.0 GPM — trigger-off bypass smoothly redirects the full 4.0 GPM flow, preventing deadhead pressure spikes during idle intervals on production wash jobs
• No downstream injector port — the RKV4G35HDF24C1 delivers straight 3,500 PSI water output. Chemical delivery managed externally through a dedicated downstream injector, soft wash proportioner, or separate chemical system.
• Engine load reduction in bypass — reduced back-pressure lowers engine load and fuel consumption during trigger-off idle intervals on full-day wash operations
• Brass body construction (AR22287) — resists corrosion from cleaning chemicals, chlorinated water, and sustained field exposure

RK Series Construction — Solid Ceramic, Forged Brass, Front-Access Service

• Solid ceramic plungers resist abrasion, heat, scoring, and chemical attack at 3,500 PSI across extended commercial operating hours. Individual replacement when service limits are reached — no full RKV4G35HDF24C1 pump replacement required.
• Forged brass manifold provides a dense, pore-free pressure vessel for sustained 3,500 PSI cycling and corrosion resistance in commercial cleaning environments
• Stainless steel check valves maintain precise seating geometry through high-cycle 3,500 PSI / 4.0 GPM operation, resisting scale and pitting that cause pressure loss over time
• Triplex three-plunger design produces smooth, overlapping pressure pulses that reduce pulsation-induced fatigue stress on hoses, spray guns, and fittings connected to the RKV4G35HDF24C1

Front-Access Serviceability — RK Series Maintenance Advantage

• Front-access piston packings — packing replacement on the RKV4G35HDF24C1 is accessible from the front of the pump without requiring full crankcase disassembly, reducing time and labor for the most frequent seal maintenance event in high-cycle commercial operation
• Front-access valve assemblies — inlet and outlet valve inspection and replacement accessible without removing the RKV4G35HDF24C1 from the engine mount in most installations, enabling valve service during scheduled maintenance windows
• Reduced maintenance downtime — shorter service windows translate directly into faster return to productive operation for contractor rigs and commercial wash operations running the RKV4G35HDF24C1 at high output daily

F24 SAE J609A — Direct Drive for Gas and Diesel Engines

• Gasoline engine compatibility — direct bolt-up to commercial gas engines with a 1″ cylindrical output shaft and SAE J609A bolt pattern in the horsepower class appropriate for 4.0 GPM / 3,500 PSI loads. Verify engine horsepower before installation.
• Diesel engine compatibility — equally compatible with standard diesel engines equipped with a 1″ crankshaft and SAE J609A bolt pattern for contractor rigs and industrial equipment
• Direct close-coupling — the RKV4G35HDF24C1 mounts face-to-face against the engine with the 1″ hollow keyway crankshaft bore engaging the engine shaft directly, eliminating belt guards, pulleys, and tensioning hardware
• Compact footprint — ideal for skid frames, trailer rigs, and OEM platforms with limited installation space
• Included mounting hardware — bolts and fasteners sized for the F24 SAE J609A bolt pattern are supplied in the box with the RKV4G35HDF24C1

Typical Applications

Where the RKV4G35HDF24C1 Delivers Best Results

• Fleet maintenance and commercial vehicle washing — trucks, trailers, buses, and service vehicles where 4.0 GPM coverage speed and 3,500 PSI cleaning force with the VR35’s stable bypass regulation handle high-volume daily wash cycles on the RKV4G35HDF24C1
• Industrial facility wash bays — warehouses, plants, and distribution centers where the RKV4G35HDF24C1’s HD construction, front-access serviceability, and VR35 bypass stability minimize maintenance downtime in multi-shift operations
• Concrete and paved surface cleaning — sidewalks, parking lots, garages, and loading docks where 14,000 CU high-volume output and external chemical management provide productive commercial cleaning results
• Agricultural and heavy equipment cleaning — tractors, harvesters, implements, and farm facilities on gas or diesel engine-powered rigs
• Mobile contractor systems — trailer and skid-mounted rigs where the RKV4G35HDF24C1’s HD construction, VR35 stability, and front-access serviceability support maximum uptime in continuous daily service
• Soft wash system rinse supply — the RKV4G35HDF24C1 provides clean 3,500 PSI / 4.0 GPM rinse water while a dedicated soft wash proportioner manages chemical delivery independently
• OEM rig builders and system integrators — the RKV4G35HDF24C1’s F24 direct-drive mounting, HD construction, and VR35 unloader stability support efficient multi-unit system design for new builds and fleet service operations

5-Year US Warranty, Full Rebuildability, and Wholesale Pricing

Heavy-Duty RK Series Performance Backed by Domestic Support

The RKV4G35HDF24C1 is protected by Annovi Reverberi’s 5-year limited warranty through AR North America’s US-based warranty and service network. Every internal wear component of the RKV4G35HDF24C1 — solid ceramic plungers, bronze connecting rods, forged brass manifold seals and o-rings, stainless valve seats and springs, Gymatic VR35 unloader service parts (AR22287), piston packing kits, and crankcase bearings — is stocked domestically through AR’s authorized distribution channels.

With consistent maintenance — break-in oil change at 50 hours, scheduled oil changes every 500 hours or 3–5 months, regular valve and packing inspection using the front-access design, and proper winterization using RV-grade environmentally safe antifreeze — the RKV4G35HDF24C1 is engineered for 10 or more years of productive commercial service life. AR North America’s domestic parts depth ensures rebuild kits, plunger sets, packing kits, and Gymatic VR35 unloader service components for the RKV4G35HDF24C1 are typically available same-week.

Contractors, rental fleet operators, municipal purchasing departments, resellers, and volume buyers are invited to contact wholesale@wshpwr.com for wholesale and special pricing on the RKV4G35HDF24C1 and the complete Annovi Reverberi pump and unloader assembly line. WSHPWR maintains one of the most complete AR North America inventories available through any US web store — with thousands of AR products in stock and a continually expanding catalog.

14,000 Cleaning Units. 3,500 PSI. 4.0 GPM. HD Construction. VR35 — 500 PSI Headroom. No Injector.

Italian Engineering. Heavy-Duty Platform. Maximum Unloader Stability at 3,500 PSI. US Warranty Coverage.

For contractors, fleet operators, industrial facility managers, and OEM rig builders who need 4.0 GPM high-volume output at 3,500 PSI — with the Gymatic VR35’s maximum 500 PSI operating headroom for the most stable bypass regulation and longest unloader service intervals in the RKV 3,500 PSI family, HD reinforced crankcase and bronze connecting rod construction for continuous commercial duty, RK Series front-access piston packing and valve serviceability, and straight water output for external chemical management — the RKV4G35HDF24C1 delivers a factory-tested, fully documented, and completely rebuildable assembly from one of the global pressure pump industry’s most trusted manufacturers. Fourteen thousand cleaning units. Direct drive. One-inch keyway shaft. VR35 bypass. 500 PSI headroom. No fixed injector. Front-access service design. Five years of US warranty. A decade of service life.