RKV4G36D-F24VR35 4.0 GPM 3500 PSI Triplex Pump | VR35

RKV4G36D-F24VR35 by Annovi Reverberi — RK Series Triplex Plunger Pump with Gymatic VR35 Unloader | 4.0 GPM | 3,600 PSI | Bronze Connecting Rods | 1″ Hollow Keyway Shaft | SAE J609A Gas and Diesel Engine Drive | No Chemical Injector

The RKV4G36D-F24VR35 by Annovi Reverberi is a professional-grade RK Series 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 3,600 PSI with dependable Gymatic VR35 bypass pressure regulation and straight high-pressure water delivery. Rated at 4.0 GPM and 3,600 PSI at 3,400 RPM, the RKV4G36D-F24VR35 delivers 14,400 cleaning units — combining the high-volume coverage speed of 4.0 GPM with 3,600 PSI pressure output that handles heavy contamination, road film, grease, and large commercial surfaces more aggressively than standard 3,000–3,200 PSI commercial platforms — through a reinforced 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 RKV4G36D-F24VR35 is the no-injector, VR35 configuration of the RKV 3,600 PSI platform — the preferred unloader specification at this pressure point. The Gymatic VR35 on the RKV4G36D-F24VR35 is rated to 4,000 PSI and 5 GPM — providing a full 400 PSI of operating headroom above 3,600 PSI, compared to the Gymatic 3/B’s 50 PSI margin at the same pressure. This 400 PSI headroom delivers confident, stable bypass regulation and extended unloader service intervals in high-cycle commercial environments.

Built by Annovi Reverberi in Modena, Italy — with US-based operations, a domestic parts distribution network, and dedicated AR North America technical support — the RKV4G36D-F24VR35 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 RKV4G36D-F24VR35 is a long-term investment in a high-output RK Series commercial pump platform capable of a decade of productive service life.

Decoding the RKV4G36D-F24VR35 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 for continuous commercial duty
• 4G36 — Performance rating: 4.0 GPM flow rate at 3,600 PSI maximum operating pressure — 14,400 cleaning units. The “36” segment follows the AR model code convention established across the RKV series.
• D — Shaft version: Direct Gas/Diesel Drive — 1″ hollow keyway crankshaft bore for direct coupling to gasoline or diesel engine 1″ output shafts
• 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)
• VR35 — Unloader system: Gymatic VR35 — AR’s elevated-capacity Gymatic internal bypass unloader rated to 4,000 PSI and 5 GPM. At 3,600 PSI the VR35 provides 400 PSI of operating headroom — stable, confident bypass regulation well within the rated envelope with substantial service life margin
• No trailing I suffix — the model terminates at VR35, confirming straight 3,600 PSI water output without an integrated downstream chemical injector

RKV4G36D-F24VR35 vs RKV4G36D-F24C2 — Unloader Specification at 3,600 PSI

Both pumps share the same RK Series platform, F24 flange, 1″ keyway shaft, reinforced crankcase, bronze connecting rods, and front-access serviceability at 4.0 GPM / 3,600 PSI. The unloader specification is the key difference:

• RKV4G36D-F24VR35 (this model) — Gymatic VR35 rated to 4,000 PSI, 400 PSI of operating headroom above 3,600 PSI. No injector. The preferred unloader specification at this pressure point for highest bypass regulation stability and longest unloader service intervals.
• RKV4G36D-F24C2 — Gymatic 3/B (C2) rated to 3,650 PSI, 50 PSI of operating headroom above 3,600 PSI. No injector. Verify C2 specification at 3,600 PSI with AR North America before specifying.

For applications where unloader service life and bypass regulation stability are priorities at 3,600 PSI, the RKV4G36D-F24VR35’s 400 PSI VR35 headroom provides a clear engineering advantage over the near-ceiling C2 pairing.

Key Specifications

RKV4G36D-F24VR35 Technical Details at a Glance

• Flow Rate: 4.0 GPM (gallons per minute)
• Maximum Pressure: 3,600 PSI
• Cleaning Units: 14,400 (GPM × PSI)
• Operating Speed: 3,400 RPM
• Pump Type: RK Series triplex ceramic plunger pump — three-piston crankshaft-driven design for smooth, consistent high-pressure output
• Crankshaft Bore: 1″ hollow keyway — direct engagement with gas or diesel engine 1″ output shaft
• Crankcase: Reinforced — heavy-duty construction for continuous commercial duty operation
• Manifold Material: Forged brass — dense, pore-free construction for corrosion resistance and sustained 3,600 PSI cycle integrity
• Plungers: Solid ceramic — exceptional hardness, wear resistance, and thermal shock resistance across extended commercial operating hours
• Connecting Rods: Bronze — premium fatigue strength and wear resistance at 4.0 GPM / 3,600 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 — brass-body internal bypass unloader, adjustable pressure regulation, rated to 4,000 PSI and 5 GPM; 400 PSI operating headroom above 3,600 PSI output
• Chemical Injector: Not included — model terminates at VR35 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 RKV4G36D-F24VR35 Assembly Ready for Installation

• Factory-installed Gymatic VR35 unloader — pre-mounted and calibrated; no downstream injector port on this RKV4G36D-F24VR35 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 RKV4G36D-F24VR35 including oil change intervals, packing and valve service guidance, and winterization protocol
• Parts schematic — exploded-view diagram with AR part numbers for every serviceable RKV4G36D-F24VR35 component
• Factory test certification — every RKV4G36D-F24VR35 load-tested at 50%, 100%, and 150% of rated output before leaving the AR manufacturing facility

The Gymatic VR35 at 3,600 PSI — 400 PSI Headroom. The Preferred Unloader at This Pressure.

Stable Regulation. Extended Service Life. External Chemical Control.

The Gymatic VR35 unloader on the RKV4G36D-F24VR35 is rated to 4,000 PSI and 5 GPM — providing 400 PSI of operating headroom above the pump’s 3,600 PSI output:

• 400 PSI headroom — confident operating zone — the VR35 at 3,600 PSI operates well within its rated envelope, producing stable, responsive bypass regulation throughout continuous production wash cycles on the RKV4G36D-F24VR35. 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 400 PSI operating headroom at 3,600 PSI produces substantially less cumulative stress on bypass valve components than a Gymatic 3/B operating at only 50 PSI below its rated ceiling. For high-cycle commercial environments, the VR35 specification on the RKV4G36D-F24VR35 extends unloader rebuild intervals and reduces service costs over the pump’s operating life.
• Adjustable then tamper-resistant — locked operating pressure maintained consistently across every operator, every shift, and every production wash cycle without re-adjustment or drift on the RKV4G36D-F24VR35
• Smooth internal bypass at 4.0 GPM — trigger-off bypass smoothly redirects the full 4.0 GPM flow at 3,600 PSI, preventing deadhead pressure spikes during idle intervals on production wash jobs
• No downstream injector port — the RKV4G36D-F24VR35 delivers straight 3,600 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 — resists corrosion from cleaning chemicals, chlorinated water, and sustained outdoor field exposure

RK Series Construction — Built for 3,600 PSI High-Volume Commercial Duty

Solid Ceramic. Forged Brass. Bronze Connecting Rods. Front-Access Service.

• Solid ceramic plungers in the RKV4G36D-F24VR35 resist abrasion, heat, and chemical attack at 3,600 PSI across extended commercial operating hours. Individual replacement when service limits are reached — no full pump replacement required.
• Bronze connecting rods provide high strength and fatigue resistance under the continuous load cycling of 4.0 GPM / 3,600 PSI operation at 3,400 RPM, distributing force evenly across the crankshaft and extending connecting rod service life compared to aluminum alternatives
• Reinforced crankcase handles the structural demands of daily professional use at 3,600 PSI, maintaining crankshaft and bearing alignment under vibration and thermal expansion cycles during continuous duty operation
• Forged brass manifold provides a dense, pore-free pressure vessel for sustained 3,600 PSI cycling and corrosion resistance across the full range of commercial cleaning environments
• Stainless steel valves maintain precise seating geometry through high-cycle 3,600 PSI / 4.0 GPM operation, resisting calcium 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, surface cleaners, and fittings connected to the RKV4G36D-F24VR35

Front-Access Serviceability — RK Series Maintenance Advantage

Packing and Valve Service Without Full Disassembly

• Front-access piston packings — packing replacement on the RKV4G36D-F24VR35 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 RKV4G36D-F24VR35 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 RKV4G36D-F24VR35 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 / 3,600 PSI loads on the RKV4G36D-F24VR35. 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 RKV4G36D-F24VR35 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 where installation space is at a premium
• Included mounting hardware — bolts and fasteners sized for the F24 SAE J609A bolt pattern are supplied in the box with the RKV4G36D-F24VR35

Typical Applications

Where the RKV4G36D-F24VR35 Delivers Best Results

• Professional pressure washing contractors with external chemical systems — 3,600 PSI / 4.0 GPM output from the RKV4G36D-F24VR35 paired with independently managed detergent delivery for concrete cleaning, building exterior washing, surface preparation, and commercial property maintenance
• Fleet washing — trucks, buses, trailers, and service vehicles where 4.0 GPM coverage speed and 3,600 PSI cleaning force handle heavy road film and grease at high throughput with chemical applied through a dedicated external system
• Industrial equipment maintenance — degreasing and washdown of heavy machinery, production equipment, and manufacturing plant assets where 3,600 PSI penetrates contamination aggressively with external chemical management
• Concrete and hard surface cleaning — sidewalks, parking lots, loading docks, garages, and warehouse floors where 14,400 CU high-volume output provides productive commercial cleaning results
• Agricultural operations — tractors, harvesters, implements, and farm infrastructure on gas or diesel engine-powered rigs where maximum volume at elevated pressure handles large surface areas
• Soft wash system rinse supply — the RKV4G36D-F24VR35 provides clean 3,600 PSI / 4.0 GPM rinse water while a dedicated soft wash proportioner manages chemical delivery independently
• Contractor rigs and OEM system builds — trailer and skid-mounted systems where the RKV4G36D-F24VR35’s compact F24 direct-drive footprint, front-access serviceability, and VR35 unloader stability support efficient daily field operations

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

High-Output RK Series Performance Backed by Domestic Support

The RKV4G36D-F24VR35 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 RKV4G36D-F24VR35 — solid ceramic plungers, bronze connecting rods, forged brass manifold seals and o-rings, stainless valve seats and springs, Gymatic VR35 unloader service parts, 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 RKV4G36D-F24VR35 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 RKV4G36D-F24VR35 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 RKV4G36D-F24VR35 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.

14,400 Cleaning Units. 3,600 PSI. 4.0 GPM. VR35 Bypass. 400 PSI Headroom. No Injector.

Italian Engineering. Preferred Unloader Specification. Front-Access Service. US Warranty Coverage.

For contractors, fleet operators, industrial maintenance teams, and OEM rig builders who need 4.0 GPM high-volume output at 3,600 PSI — with the Gymatic VR35 operating with 400 PSI of comfortable headroom for maximum bypass regulation stability and extended unloader service life, straight water output for external chemical management, RK Series reinforced crankcase with front-access piston packing and valve serviceability, and bronze connecting rods — the RKV4G36D-F24VR35 delivers a factory-tested, fully documented, and completely rebuildable assembly from one of the global pressure pump industry’s most trusted manufacturers. Fourteen thousand four hundred cleaning units. Direct drive. One-inch keyway shaft. VR35 bypass. No fixed injector. Front-access service design. Five years of US warranty. A decade of service life.

Volume buyers, resellers, and rental fleet operators can reach the WSHPWR wholesale team directly at wholesale@wshpwr.com to discuss pricing for quantity purchases across the complete Annovi Reverberi lineup — including pumps, unloader assemblies, and service parts.