Graco 127526 Annovi Reverberi Unloader Kit

High-Precision Unloader Kit for AR Pumps: Graco 127526 Annovi Reverberi Unloader Integration and Performance Analysis

The Graco 127526 Annovi Reverberi Unloader Kit is engineered to optimize fluid control in advanced air and hydraulic circuits typical in industrial spraying systems. Designed specifically for AR pump configurations, this kit integrates a precision-machined relief valve, high-strength stainless steel housing, and performance-grade seals to achieve consistent cycle rates at pressures up to 3,000 psi. Ideal for heavy-duty surface preparation, the assembly enhances the responsiveness of any airless sprayer platform by modulating downstream flow when trigger is released, thereby preventing overpressurization and reducing pulsation during continuous operation.

• Complete kit includes valve assembly, spring cap, piston carrier, and O-ring set calibrated for 2,500–3,500 psi ranges.
• Compatible with most Annovi Reverberi and AR pump models featuring 3/8" ports and standard flange mounting.
• Recommended for solvents, latex-based coatings, and high-viscosity materials used in professional coatings applications.

The unloader mechanism utilizes a dual-spring system and precision metering orifice to regulate bypass flow, ensuring optimal pump efficiency by minimizing energy losses during idle cycles. The valve’s cam-driven interface allows adjustment of cracking pressure via a calibrated thumbwheel, deliv

Graco 127526 Annovi Reverberi Unloader Kit Overview

Compatible Machines

• Graco AR Pumps with 3/8" Ports
• Annovi Reverberi Industrial Pump Models
• Professional Airless Sprayers for High-Viscosity Coatings
• Contractor Spray Lines and Industrial Coating Systems

Product Highlights

• Precision pressure regulation up to 3,000 psi for consistent output
• Durable 17-4 PH stainless steel housing with corrosion resistance
• Dual-spring unloader mechanism with calibrated thumbwheel for repeatable performance
• Reduces pulsation, overspray, and overpressurization during continuous operation
• Compatible with solvents, latex, and high-viscosity professional coatings

Materials and Specifications

Installation & Maintenance

• Torque mounting bolts to 18 lb·ft and set spring preload with supplied shims
• Routine inspection of O-rings and spring tension every 500 operational hours
• High-pressure filtration upstream recommended to protect internal components
• Streamlined flow path reduces shear on coatings for uniform film thickness

Frequently Asked Questions

ering repeatable performance across multiple coats. Its streamlined flow path reduces shear on fluid particles, supporting uniform film thickness in fine-finish operations. High-pressure filtration upstream of the unloader is recommended to protect the internal bore from particulate ingress, further extending maintenance intervals and safeguarding pump life.

Material selection is critical for prolonged service in demanding environments. The housing is CNC-machined from 17-4 PH stainless steel for superior corrosion resistance under cyclic loading. Internal components utilize hardened 440C stainless steel alloy to resist galling, while seals are available in both nitrile and PTFE to accommodate a wide chemical spectrum. Strategic placement of backup rings and specialized elastomers ensures exceptional seal longevity, even when exposed to abrasive additives and fluctuating temperatures ranging from -20°C to 80°C.

Performance validation tests reveal stable flow rates of up to 1.5 gallons per minute at 3,000 psi with less than 2% deviation over 10,000 actuations. Installation requires torqueing the mounting bolts to 18 lb·ft and calibrating the spring preload per the supplied shims to set the precise relief threshold. Routine inspection of O-ring integrity and spring tension is recommended every 500 operational hours. When integrated into professional coatings lines, the Graco 127526 kit delivers unmatched consistency in thin-film deposition, reduced downtime, and robust protection for critical pump and filter assemblies under sustained high-pressure filtration demands.