AR51204 | VB80/150 Unloader Valve, Brass

AR51204 | VB80/150 Unloader Valve, Brass

The Annovi Reverberi AR51204 VB80/150 Unloader Valve is a high-performance pressure regulation component engineered for reliability, safety, and smooth operation in professional cleaning systems. Rated for up to 150 BAR (≈2,175 PSI), it is built to handle the rigorous demands of commercial and industrial pressure washers while providing NPT-threaded connections for direct integration with North American plumbing standards.

At its core, the AR51204 automatically diverts water into bypass whenever the spray trigger is released or flow is interrupted. This keeps system pressure within safe limits, protecting pumps, hoses, and fittings from damaging spikes during idle cycles and stop-start operation.

Pressure Regulation & Protection

• Automatic bypass function sends water to bypass when the trigger is closed or flow is restricted.
• Prevents overpressure conditions that can cause seal damage, hose rupture, or pump failure.
• Maintains stable working pressure during continuous use in contractor-grade systems.
• Helps extend the service life of pumps, seals, hoses, and spray accessories by reducing stress.

Construction & Compatibility

• High-grade brass body with precision internal components for long, reliable service.
• Engineered to withstand high-frequency cycling and constant pressure fluctuations in industrial duty.
• NPT threading provides a tight, leak-free connection for standard North American plumbing layouts.
• Ideal for systems using NPT hose kits, pumps, and accessories without extra adapters.

Installation & Service

• Plug-and-play design simplifies installation on new or existing pressure washer frames.
• Compact housing fits easily into confined cabinets and mobile rigs where space and weight matter.
• Technician-friendly layout allows quick inspection, servicing, or pressure checks without removing the valve.
• Designed to minimize downtime in the field by enabling fast swap-outs and straightforward maintenance.

Key Specifications

• Model: AR51204 VB80/150 Unloader Valve
• Maximum pressure: 150 BAR (≈2,175 PSI)
• Maximum flow: up to 21 GPM (VB80 high-flow body)
• Maximum temperature: ≈195°F (90°C)
• Inlet: 1/2 in NPT female
• Outlet: 1/2 in NPT female
• Bypass: 1/2 in NPT female
• Thread type: NPT (National Pipe Thread)
• Body material: Brass with precision-machined internals
• Function: Automatic bypass and pressure regulation for high-pressure pump systems
• Use profile: Continuous commercial and industrial cleaning duty

Typical Applications

• Contractor-grade cleaning rigs used for building, fleet, and surface cleaning.
• Industrial pressure washer systems in plants, factories, and processing facilities.
• Permanent wash bays and installations built around NPT plumbing standards.
• Equipment builders and distributors assembling NPT-based pump and hose packages.
• Mobile detailers and commercial operators needing a compact, rugged unloader valve for daily use.

AR51204 | VB80/150 Unloader Valve, Brass

• The AR51204 VB80/150 Unloader Valve delivers reliable control, safety, and performance for heavy-use pressure washer systems. Its brass construction, automatic bypass protection, and NPT-threaded compatibility make it a smart choice wherever uptime, equipment protection, and standard plumbing fit are critical.