RKA4037NLMVR35 Industrial Triplex Pump | 1750 RPM

RKA4037NLMVR35 by Annovi Reverberi — Industrial Triplex Plunger Pump with Gymatic VR35 Unloader | 4.0 GPM | 3,700 PSI | Bronze Connecting Rods | Brass Manifold | 45mm Extended Solid Shaft | 1,750 RPM Belt-Drive Platform | No Chemical Injector

The RKA4037NLMVR35 by Annovi Reverberi is a heavy-duty RKA Series industrial triplex ceramic plunger pump engineered for belt-drive and electric motor-driven pressure washing systems requiring 4.0 GPM at 3,700 PSI with Gymatic VR35 bypass regulation and straight high-pressure water delivery. Rated at 4.0 GPM and 3,700 PSI at 1,750 RPM, the RKA4037NLMVR35 delivers 14,800 cleaning units — combining 4.0 GPM high-volume output with 3,700 PSI penetrating impact for fleet wash bays, industrial and agricultural wash stations, contractor trailer and skid systems, heavy equipment cleanup, and facility maintenance — through bronze connecting rods, solid ceramic plungers, brass manifold, and a 45mm extended solid shaft purpose-built for v-belt pulley, poly-drive belt, and flexible coupling installations.

The RKA4037NLMVR35 carries the factory-installed Gymatic VR35 unloader — rated to 4,000 PSI and 5 GPM, providing 300 PSI of operating headroom at 3,700 PSI for stable, controlled bypass regulation. No chemical injector — straight 3,700 PSI water output for operators managing chemical delivery through an external downstream system. Operating at 1,750 RPM on a belt-drive platform, the RKA4037NLMVR35 delivers the thermal efficiency and extended component life of low-speed operation at a high-output 3,700 PSI duty point. Built by Annovi Reverberi in Modena, Italy — with US-based operations, a domestic parts distribution network, and dedicated technical support — this pump arrives pre-filled with factory break-in oil, factory-tested, and ready for installation. Protected by a 5-year US limited warranty and built to be fully rebuilt rather than replaced, the RKA4037NLMVR35 is a long-term industrial investment capable of a decade of productive service life.

Factory-Matched and Approved — The RKA4037NLMVR35 Complete Assembly Advantage

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

Every RKA4037NLMVR35 ships as a factory-matched, factory-approved, and factory-installed complete pump and unloader assembly:

• Factory-matched VR35 for 3,700 PSI — the Gymatic VR35 is factory-calibrated for this pump’s 4.0 GPM / 3,700 PSI operating point with 300 PSI of headroom below the VR35’s rated ceiling for stable bypass behavior across continuous industrial belt-drive duty cycles.
• Factory-approved configuration — the complete assembly is Annovi Reverberi’s validated specification for this model. Operating with the factory-installed components maintains full 5-year warranty coverage.
• Factory-installed and tested — every RKA4037NLMVR35 exits the manufacturing facility with the VR35 unloader mounted, calibrated, and tested for flow, pressure, and leak-free operation before shipment.
• Eliminates mismatch returns — incorrect unloader specification is the most common source of industrial pump system returns. The factory-matched assembly eliminates this before the pump leaves the box.
• Installation-ready — connect to the power source via belt coupling, connect system hoses using the supplied banjo bolts and O-rings, and start. The RKA4037NLMVR35 arrives engineered, assembled, and ready.

Decoding the RKA4037NLMVR35 Model Number

What Every Segment of This Annovi Reverberi Pump Designation Tells You

• RKA — Pump series: RKA Series industrial triplex plunger pump — Annovi Reverberi’s commercial and industrial belt-drive and electric motor platform
• 40 — Flow rate: 4.0 GPM
• 37 — Maximum pressure: 3,700 PSI — 4.0 × 3,700 = 14,800 cleaning units
• L — Shaft length: 45mm extended solid shaft — purpose-built for v-belt pulley, poly-drive belt, and flexible coupling installations requiring additional engagement depth beyond standard shaft length; supports flexible pulley alignment on skid and trailer frames
• VR35 — Unloader system: Gymatic VR35 — rated to 4,000 PSI and 5 GPM; 300 PSI of operating headroom at 3,700 PSI; factory-matched and factory-installed
• No trailing I suffix — confirms straight 3,700 PSI water output without a factory-installed downstream chemical injector

Key Specifications

RKA4037NLMVR35 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: 1,750 RPM — low-speed belt-drive platform for reduced heat and extended component service intervals
• Pump Type: RKA Series industrial triplex ceramic plunger pump
• Shaft Length: 45mm extended solid shaft (L designation) — v-belt, poly-drive belt, and flexible coupling ready
• Manifold Material: Brass — corrosion-resistant construction for sustained 3,700 PSI cycle integrity
• Plungers: Solid ceramic — exceptional wear resistance and thermal stability
• Connecting Rods: Bronze — premium fatigue strength and wear resistance at 4.0 GPM / 3,700 PSI continuous industrial duty cycles
• Serviceability: Oil sight glass and vented dipstick for simplified routine maintenance
• Lubrication: Oil-bath crankcase with factory pre-filled break-in oil
• Unloader System: Gymatic VR35 — rated 4,000 PSI / 5 GPM; 300 PSI operating headroom; factory-matched and factory-installed
• Connections: Banjo bolts and sealing O-rings — standard VR family hardware supplied for secure, leak-resistant installation
• Chemical Injector: Not included — straight 3,700 PSI water output; chemical delivery managed externally
• Warranty: 5-year limited warranty — US-based coverage through Annovi Reverberi North America

What’s Included in the Box

A Complete, Factory-Configured RKA4037NLMVR35 Assembly Ready for Installation

• Factory-matched Gymatic VR35 unloader — installed and calibrated for the 4.0 GPM / 3,700 PSI operating point; no downstream injector port on this variant
• Banjo bolts and sealing O-rings — standard VR family hardware for secure, leak-resistant unloader connections
• Factory break-in oil — crankcase pre-filled to the correct operating level for first startup
• Oil sight glass and vented dipstick — at-a-glance oil level monitoring and simplified oil changes
• Mounting hardware — for belt-drive installation on compatible skid and trailer frames
• Operator’s manual — complete installation, startup, operating, and maintenance procedures including belt-drive alignment guidance, oil service intervals, and winterization protocol
• Parts schematic — exploded-view diagram with Annovi Reverberi part numbers for every serviceable RKA4037NLMVR35 component

Gymatic VR35 — 300 PSI Headroom. Stable Bypass. Clean Water Output at 3,700 PSI.

Factory-Approved. Controlled Bypass. No Injector. Industrial Belt-Drive Rated.

• 300 PSI of operating headroom at 3,700 PSI — the VR35 on the RKA4037NLMVR35 operates below its 4,000 PSI rated ceiling, providing stable, predictable bypass regulation throughout continuous industrial cleaning cycles at maximum operating pressure
• Stable pressure control via belt-drive pulley selection — belt-drive configurations allow engineers and contractors to set the correct pulley ratio for the RKA4037NLMVR35’s 1,750 RPM operating speed from a variety of power sources, with the factory-set VR35 maintaining stable pressure at the established duty point
• Controlled bypass during trigger cycling — smooth bypass at trigger release protects the RKA4037NLMVR35 and downstream accessories from pressure spikes throughout continuous high-pressure cleaning cycles
• No factory-installed injector — straight 3,700 PSI water output. Chemical delivery managed externally through a dedicated downstream injector or soft wash system when soap application is required.
• Extended unloader service intervals — VR35 bypass components operating with 300 PSI of headroom below rated ceiling on the RKA4037NLMVR35 experience reduced cumulative stress compared to ceiling-pressure pairings, supporting longer rebuild intervals in industrial continuous-duty environments

1,750 RPM Belt-Drive at 3,700 PSI — Industrial Continuous Duty

High Output. Low Speed. Extended Component Life. Flexible Pulley Alignment.

• 1,750 RPM at 3,700 PSI output — the RKA4037NLMVR35 delivers a high-output 3,700 PSI / 4.0 GPM / 14,800 cleaning unit performance point at 1,750 RPM, combining the thermal and wear advantages of low-speed operation with maximum-pressure industrial cleaning capability
• Extended seal and bearing intervals — lower rotational speed on the RKA4037NLMVR35 reduces cumulative heat, friction, and reciprocating load on ceramic plungers, piston packings, and crankcase bearings, extending service intervals in high-cycle fleet wash and industrial cleaning programs
• 45mm extended solid shaft for flexible pulley alignment — supports v-belt and poly-drive belt configurations on skid frames, trailer builds, and OEM installations where the extended shaft length provides correct pulley engagement depth and belt alignment geometry for the RKA4037NLMVR35
• Bronze connecting rods for 3,700 PSI continuous duty — the RKA4037NLMVR35’s bronze connecting rods provide the fatigue resistance and load-bearing strength required for continuous industrial belt-drive operation at maximum pressure
• Optimized for repeatable OEM builds — the RKA4037NLMVR35’s factory-installed VR35, 45mm extended solid shaft, and industrial construction support consistent commissioning and field-replaceable service workflows across contractor and OEM installations

Typical Applications

Where the RKA4037NLMVR35 Delivers Best Results

• Fleet wash bays, truck depots, and vehicle rental facilities — the RKA4037NLMVR35’s 4.0 GPM output and 3,700 PSI cleaning force handle fleet vehicle contamination efficiently in belt-drive production wash bay environments
• Industrial and agricultural wash stations requiring continuous-duty runtime — 14,800 cleaning units of output with 1,750 RPM low-speed operation supports extended multi-shift production programs where uptime and rebuildability are operational requirements
• Contractor trailer and skid-mounted pressure washer systems — the RKA4037NLMVR35’s 45mm extended solid shaft, factory-matched VR35 assembly, and belt-drive architecture support reliable integration into professional contractor and OEM trailer systems
• Heavy equipment cleanup for construction, mining, and earthmoving fleets — 3,700 PSI maximum penetrating impact handles maximum contamination loads on heavy equipment yards and job sites
• Facility maintenance requiring low-RPM reliability and rebuildability — the RKA4037NLMVR35’s 1,750 RPM belt-drive platform, bronze rod construction, and fully rebuildable architecture support long-term facility cleaning programs where predictable maintenance costs and maximum uptime are operational priorities

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

Industrial RKA Series Performance Backed by Domestic Support

The RKA4037NLMVR35 is protected by Annovi Reverberi’s 5-year limited warranty through the US-based warranty and service network. Every internal wear component — solid ceramic plungers, bronze connecting rods, brass manifold seals and o-rings, Gymatic VR35 unloader service parts, piston packing kits, and crankcase bearings — is stocked domestically through authorized distribution channels. Contractors, industrial facility managers, fleet operators, municipal purchasing departments, resellers, and volume buyers are invited to contact the WSHPWR wholesale team for pricing on the RKA4037NLMVR35 and the complete Annovi Reverberi pump and unloader assembly line. WSHPWR maintains one of the most complete Annovi Reverberi inventories available through any US web store — with thousands of products in stock and a continually expanding catalog.

14,800 Cleaning Units. 3,700 PSI. 4.0 GPM. 1,750 RPM. 45mm Extended Shaft. VR35. No Injector.

Italian Engineering. High-Output Industrial Belt-Drive Platform. Factory-Approved Assembly. US Warranty Coverage.

For contractors, fleet operators, industrial maintenance teams, agricultural operations, and facility managers who need 4.0 GPM at 3,700 PSI on a 1,750 RPM belt-drive platform — with a 45mm extended solid shaft for correct v-belt and poly-drive belt pulley engagement, bronze connecting rods for continuous high-pressure industrial duty, factory-matched Gymatic VR35 with 300 PSI of operating headroom, straight water output for external chemical management, and a completely rebuildable platform backed by a 5-year US warranty — the RKA4037NLMVR35 delivers a purpose-engineered high-output industrial solution from one of the global pressure pump industry’s most trusted manufacturers. Five years of US warranty. A decade of service life.

Volume buyers can reach the WSHPWR wholesale team directly at wholesale@wshpwr.com to discuss pricing for quantity purchases across the complete Annovi Reverberi lineup.