RKV4037F24VR35I | 3400 RPM High-Pressure Triplex Pump

RKV4037F24VR35I by Annovi Reverberi — RK Series Triplex Plunger Pump with Gymatic VR35 Unloader and Chemical Injector | 4.0 GPM | 3,700 PSI | Bronze Connecting Rods | 1″ Hollow Keyway Shaft | SAE J609A Gas and Diesel Engine Drive

The RKV4037F24VR35I by Annovi Reverberi is a high-output RK Series triplex ceramic plunger pump engineered for gas and diesel engine-driven commercial and industrial pressure washing systems requiring 4.0 GPM at 3,700 PSI with the elevated bypass regulation capacity of the Gymatic VR35 unloader and integrated downstream chemical application capability. Rated at 4.0 GPM and 3,700 PSI at 3,400 RPM, the RKV4037F24VR35I delivers 14,800 cleaning units — combining the high-volume coverage speed of 4.0 GPM with 3,700 PSI focused impact output that cuts through baked-on mud, heavy grease, oil, road film, and industrial residue in fewer passes — through a reinforced crankcase with an oversized crankshaft, bronze connecting rods, solid ceramic plungers, brass manifold, stainless steel check valves, and an F24 SAE J609A direct-drive flange for close-coupling to gasoline or diesel engines.

The RKV4037F24VR35I carries the Gymatic VR35 unloader — rated to 4,000 PSI and 5 GPM — with an active factory-integrated downstream chemical injector. At 3,700 PSI the VR35 operates with 300 PSI of headroom below its rated ceiling, maintaining stable bypass regulation across continuous high-pressure production wash cycles. The integrated I-series chemical injector enables low-pressure detergent application without separate external injector hardware, delivering the complete two-mode wash platform — high-pressure rinse at 14,800 cleaning units and low-pressure chemical pre-soak — from a single factory-matched, factory-approved assembly.

Built by Annovi Reverberi in Modena, Italy — with US-based operations, a domestic parts distribution network, and dedicated AR North America technical support — the RKV4037F24VR35I arrives as a complete, factory-tested assembly. Pre-filled with AR break-in oil, equipped with the factory-matched VR35 unloader and active downstream chemical injector, 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 RKV4037F24VR35I is a long-term investment capable of a decade of productive commercial service life.

Factory-Matched and Approved — The RKV4037F24VR35I Complete Assembly Advantage

No Mismatches. No Guesswork. No Warranty Risk. Just Install and Run.

Every RKV4037F24VR35I ships as a factory-matched, factory-approved, and factory-installed complete pump and unloader assembly — the Gymatic VR35 unloader and integrated chemical injector selected, calibrated, and installed by Annovi Reverberi specifically for this pump’s 4.0 GPM / 3,700 PSI operating point:

• Factory-matched VR35 and injector for 3,700 PSI — the VR35 unloader and I-series injector on the RKV4037F24VR35I are factory-calibrated for this pump’s specific 4.0 GPM / 3,700 PSI output. Bypass response, pressure regulation range, and chemical injector draw characteristics are factory-engineered as a complete system — not assembled from separately sourced components in the field.
• Factory-approved configuration — the complete RKV4037F24VR35I assembly is validated and approved by AR North America for this duty point. Operating with the factory-installed components maintains full 5-year warranty coverage. Substituting aftermarket or lower-rated unloader components risks both warranty coverage and unstable pressure behavior at 3,700 PSI.
• Factory-installed and tested — every RKV4037F24VR35I exits the AR manufacturing facility with the VR35 unloader and injector mounted, calibrated, and load-tested at 50%, 100%, and 150% of rated output before shipment. No field assembly, no calibration guesswork, no first-run uncertainty about bypass response.
• Eliminates component mismatch returns — unloader specifications not matched to the pump’s flow rate and pressure are among the most common causes of performance problems and warranty disputes on high-output commercial builds. The factory-matched RKV4037F24VR35I assembly eliminates this failure mode before the pump leaves the box.
• Stress-free installation — mount the pump to the engine, connect system hoses, connect the detergent supply line to the injector port, add fuel, and start. The RKV4037F24VR35I arrives engineered, assembled, and ready. No additional sourcing, no assembly variables, no surprises.

Decoding the RKV4037F24VR35I 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
• 40 — Flow rate: 4.0 GPM per AR model code convention
• 37 — Maximum pressure: 3,700 PSI per AR model code convention — 4.0 × 3,700 = 14,800 cleaning units
• 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 unloader family rated to 4,000 PSI and 5 GPM. At 3,700 PSI the VR35 operates with 300 PSI of headroom below its rated ceiling — within the VR35’s rated envelope. Unloader part reference: AR22287 (adjustable Gymatic VR35, 4,000 PSI, 5 GPM, brass body).
• I — Chemical injector: Included — an I-series downstream soap and chemical injector is factory-integrated into the Gymatic VR35 assembly, enabling low-pressure detergent application without a separate injector fitting

Key Specifications

RKV4037F24VR35I Technical Details at a Glance

• Flow Rate: 4.0 GPM (gallons per minute)
• Maximum Pressure: 3,700 PSI
• Cleaning Units: 14,800 (GPM × PSI)
• Operating Speed: 3,400 RPM
• Pump Type: RK Series triplex ceramic plunger pump — three-piston crankshaft-driven design for smooth, low-pulsation high-pressure output
• Crankshaft: Oversized — engineered for the sustained mechanical demands of 4.0 GPM / 3,700 PSI continuous commercial duty
• Manifold Material: Brass — corrosion-resistant construction for sustained 3,700 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 / 3,700 PSI continuous duty cycles
• Valves: Stainless steel check valves — pre-installed for reliable sealing under continuous high-pressure operation
• 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, 1″ shaft, gas and diesel engine compatible (AR part AR41866)
• Unloader System: Gymatic VR35 (AR22287) with integrated I-series downstream chemical injector — brass body, adjustable pressure regulation, rated to 4,000 PSI and 5 GPM; 300 PSI operating headroom above 3,700 PSI output; factory-matched and factory-installed
• Chemical Injector: Included — I-series downstream venturi injector factory-integrated into Gymatic VR35 assembly
• Warranty: 5-year limited warranty — US-based coverage through AR North America; maintained with factory-installed components

What’s Included in the Box

A Complete, Factory-Configured RKV4037F24VR35I Assembly Ready for Installation

• Factory-matched Gymatic VR35 unloader with active I-series chemical injector (AR22287) — selected, calibrated, and installed by AR North America for the RKV4037F24VR35I’s 4.0 GPM / 3,700 PSI operating point; injector port ready for detergent supply line connection
• 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
• Stainless steel check valves and premium seals — pre-installed from the factory for reliable sealing under continuous 3,700 PSI operation
• 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 RKV4037F24VR35I including oil change intervals, chemical injector care, and winterization protocol
• Parts schematic — exploded-view diagram with AR part numbers for every serviceable RKV4037F24VR35I component
• Factory test certification — every RKV4037F24VR35I load-tested at 50%, 100%, and 150% of rated output before leaving the AR manufacturing facility

Gymatic VR35 with I-Series Injector — Two-Mode 3,700 PSI / 14,800 CU Platform

Focused High-Pressure Impact. Chemical Pre-Soak. Factory-Matched for 3,700 PSI.

The Gymatic VR35 (AR22287) with active I-series injector on the RKV4037F24VR35I is rated to 4,000 PSI — operating with 300 PSI of headroom above 3,700 PSI:

• 300 PSI headroom — within the VR35 rated envelope — the VR35 at 3,700 PSI operates below its 4,000 PSI rated ceiling on the RKV4037F24VR35I, maintaining bypass regulation integrity at this high-pressure operating point. Bypass transitions protect hoses, spray guns, and downstream accessories at every trigger release.
• 14,800 cleaning units through high-pressure focus — the RKV4037F24VR35I’s 3,700 PSI output delivers more penetrating impact per cleaning unit than lower-pressure alternatives, cutting through baked-on contamination in fewer passes on concrete, steel, and heavily soiled commercial surfaces
• I-series venturi-driven downstream injection — the factory-integrated injector draws detergent, degreaser, or pre-soak solution from a supply container when the RKV4037F24VR35I operator switches to low-pressure application mode. No separate injector hardware required.
• Two-mode workflow — chemical pre-soak breaks down heavy grease, road film, and industrial residue; full 3,700 PSI / 4.0 GPM rinse removes loosened material at maximum cleaning energy. Switch between modes without changing equipment or tools on the RKV4037F24VR35I.
• Simplified plumbing — combining VR35 pressure regulation and chemical injection in a single factory-installed unit on the RKV4037F24VR35I reduces total fitting count and minimizes potential leak points
• Adjustable then tamper-resistant — operating pressure set on-site and locked before production, maintained consistently across every operator and every job cycle
• 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
• Injector maintenance — flush the RKV4037F24VR35I injector circuit with clean water after every detergent session to preserve long-term venturi function

RK Series Construction — Built for 3,700 PSI High-Output Commercial Duty

Solid Ceramic. Brass Manifold. Bronze Connecting Rods. Oversized Crankshaft. Front-Access Service.

• Solid ceramic plungers provide excellent wear and heat resistance on the RKV4037F24VR35I, protecting seals and extending service intervals in high-temperature, high-duty environments. Individual replacement when service limits are reached.
• Bronze connecting rods and the oversized crankshaft on the RKV4037F24VR35I deliver the mechanical strength required for long hours of operation at full 3,700 PSI load, distributing reciprocating forces evenly for sustained commercial duty
• Brass manifold resists corrosion and maintains accurate sealing surfaces on the RKV4037F24VR35I, ensuring consistent pressure performance over the pump’s service life
• Stainless steel check valves provide consistent sealing and rapid pressure recovery under high-frequency trigger cycling at 3,700 PSI
• Triplex three-plunger design produces smooth, low-pulsation flow that reduces vibration and fatigue on hoses, spray guns, and fittings throughout the wash system connected to the RKV4037F24VR35I

Front-Access Serviceability and Maintenance

Protecting the RKV4037F24VR35I Investment Through Planned Maintenance

• Front-access piston packings and valve assemblies — packing and valve service on the RKV4037F24VR35I is accessible with standard tools from the front of the pump without full crankcase disassembly
• Oil sight glass and vented dipstick — at-a-glance oil level confirmation and simplified oil change procedures without removing the RKV4037F24VR35I from service
• Oil service on schedule — break-in oil change at 50 hours; full service every 500 hours or 3–5 months. Clean oil and correct level protect bearings and crankshaft integrity at 3,700 PSI continuous commercial duty.
• Chemical injector circuit flushing — flush the RKV4037F24VR35I injector circuit with clean water after every detergent session to prevent chemical residue buildup in the venturi passage
• Inlet supply must exceed 4.0 GPM — ensure inlet supply, filtration, and suction plumbing are sized for the RKV4037F24VR35I’s 4.0 GPM demand to prevent cavitation-related wear at this pump’s elevated operating pressure
• Winterization is mandatory — protect the RKV4037F24VR35I with RV-grade environmentally safe antifreeze for storage and transport in cold conditions to prevent cracked manifolds and destroyed seals

Typical Applications

Where the RKV4037F24VR35I Delivers Best Results

• Fleet cleaning — trucks, buses, delivery vans, and service vehicles where the RKV4037F24VR35I’s 3,700 PSI focused impact with integrated detergent capability handles heavy road film and grease in fewer passes
• Construction equipment washdown — bulldozers, loaders, excavators, and skid steers where 14,800 CU output and chemical pre-treatment through the factory-integrated injector handle maximum mud, concrete, and hydraulic oil contamination
• Agricultural machinery — tractors, harvesters, sprayers, and farm trailers where 3,700 PSI penetrating impact with on-demand detergent capability handles heavy organic and chemical contamination efficiently
• Industrial facilities — wash bays, process-area cleanup, and equipment maintenance where the RKV4037F24VR35I’s high-pressure two-mode capability supports aggressive degreasing and thorough rinsing from a single pump assembly
• Marine services — boats, docks, marina washdown, and portside maintenance where the RKV4037F24VR35I’s brass manifold construction and VR35 stable pressure regulation are both operationally relevant
• Mobile contractor rigs — trailer- and truck-mounted systems where the RKV4037F24VR35I’s factory-matched VR35 + injector assembly, compact F24 direct-drive footprint, and 14,800 CU high-pressure output support reliable all-day professional cleaning operations

For operators who prefer a fully configured direct-drive system rather than a bare pump assembly, WSHPWR also carries complete gas and diesel engine pump packages ready to mount on a frame or trailer.

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

High-Output RK Series Performance Backed by Domestic Support

The RKV4037F24VR35I is protected by Annovi Reverberi’s 5-year limited warranty through AR North America’s US-based warranty and service network. Warranty coverage is maintained by operating the RKV4037F24VR35I with the factory-installed components and following published installation and maintenance requirements. Every internal wear component — solid ceramic plungers, bronze connecting rods, brass manifold seals and o-rings, stainless check 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. Contractors, rental fleet operators, municipal purchasing departments, resellers, and volume buyers are invited to contact the WSHPWR wholesale team for pricing on the RKV4037F24VR35I 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.

14,800 Cleaning Units. 3,700 PSI. 4.0 GPM. VR35 Factory-Matched. Two-Mode. Integrated Injector.

Italian Engineering. High-Pressure Factory-Approved Assembly. No Mismatches. US Warranty Coverage.

For contractors, fleet operators, industrial maintenance professionals, agricultural teams, and marine facility operators who need 4.0 GPM output at 3,700 PSI focused high-pressure impact — in a factory-matched, factory-approved, and factory-tested complete pump and unloader assembly featuring the Gymatic VR35 with integrated I-series chemical injector for two-mode wash capability, eliminating mismatch risk and maintaining full warranty coverage from day one — the RKV4037F24VR35I delivers a properly engineered, completely rebuildable high-pressure cleaning solution from one of the global pressure pump industry’s most trusted manufacturers. Fourteen thousand eight hundred cleaning units. Direct drive. One-inch keyway shaft. Factory-matched VR35 bypass with integrated 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.