VHP50-400 | 5800 PSI High-Pressure Compact Unloader Valve Unit

VHP50-400 – Unloader Valve – 5800 PSI

The Annovi Reverberi VHP50-400 is a high-capacity unloader valve engineered for the most demanding
professional and industrial cleaning applications. Rated for a maximum operating pressure of
5,800 PSI (≈400 BAR), it provides uncompromising safety, smooth regulation, and long-term reliability
in heavy-duty systems where pump protection and operator safety cannot be compromised. With
1/2″ F x 1/2″ F threaded ports, the VHP50-400 integrates securely into a wide range of
industrial-grade pressure washers, high-volume contractor rigs, and fixed facility wash stations.

At its core, the VHP50-400 features a rugged housing and precision-machined internal components,
built to withstand the extreme forces generated by ultra-high-pressure systems. By instantly diverting
water into bypass mode when the spray gun trigger is released, the valve prevents dangerous overpressure
that could damage pumps, hoses, fittings, and spray equipment. This not only ensures operator safety but
also significantly extends the service life of critical pump assemblies.

Heavy-Duty Protection Under Extreme Pressures

The VHP50-400 belongs to AR’s line of industrial-grade unloader valves specifically designed to thrive
under the stress of continuous 24/7 operation. At 5,800 PSI, even small fluctuations in system pressure
can create damaging loads on pump seals, bearings, and pistons. The bypass mechanism in this model
activates instantly, absorbing those surges and redirecting fluid safely.

For contractors and facility managers, this means:

• Reduced downtime – pumps last longer and require fewer rebuilds.
• Increased system reliability – consistent bypass function keeps pressure stable.
• Lower maintenance costs – protects hoses, fittings, and downstream accessories from premature wear.
• Improved operator safety – minimizes the risk of pressure spikes reaching the spray gun.

Built for Continuous Use

High-output cleaning systems—such as those used in fleet wash bays, industrial plants, or marine yards—
rarely operate in short cycles. Instead, they run for hours at a time under maximum load. The VHP50-400
is designed with:

• Rugged housing that withstands constant pressure cycling.
• Heat- and wear-resistant internals engineered for endurance.
• Service-friendly design for quick inspection and replacement.

This durability makes it a trusted choice for contractors and facilities that cannot afford interruptions.

Compact and Versatile Design

While rated for extreme pressures, the VHP50-400 remains compact enough to integrate easily into new systems
or as a direct replacement valve. Its 1/2″ F x 1/2″ F ports provide straightforward compatibility with standard
plumbing configurations, reducing the need for adapters or custom fittings.

This versatility makes it equally suitable for:

• Mobile contractor rigs that require reliable, rugged parts.
• Fixed industrial wash stations in factories or plants.
• Marine and shipyard cleaning systems exposed to salt and moisture.
• Construction cleaning operations where durability is critical.

Benefits to Operators & Facilities

• Extended pump life – less wear on seals, valves, and bearings.
• Safe operation – automatic bypass prevents dangerous overpressure events.
• Cost savings – reduces service intervals and protects high-value components.
• Ease of installation – standard ports and compact body for quick setup.
• Trusted durability – engineered for continuous high-pressure operation.

Typical Applications

The VHP50-400 is used worldwide in industries where extreme water pressure is required for effective cleaning:

• Industrial Cleaning Facilities – large-scale cleaning systems operating continuously.
• Contractor Systems – high-output mobile rigs tackling concrete, equipment, and fleets.
• Marine Cleaning – shipyards, docks, and vessel maintenance requiring corrosion-resistant reliability.
• Facility Maintenance – heavy-use wash bays in transportation, waste management, and municipal operations.
• Oil & Gas Support Services – rigs and equipment requiring ultra-high-pressure cleaning with strict safety protocols.

Key Features & Applications

• Pressure Rating: 5,800 PSI (≈400 BAR)
• Connections: 1/2″ F x 1/2″ F threaded ports
• Function: Automatic bypass to protect pumps and system components
• Construction: Rugged housing, precision-machined internals for continuous duty
• Applications: Industrial cleaning, contractor systems, facility maintenance, marine yards,
  construction wash stations

✅ The Annovi Reverberi VHP50-400 stands as a benchmark unloader valve in the extreme-duty category. By combining
smooth bypass regulation, industrial-strength construction, and operator safety, it ensures reliable performance
under the heaviest workloads. For contractors and facilities running 5,800 PSI systems, this valve is not just a
component—it is an essential safeguard for protecting pumps, maximizing uptime, and keeping operations running at
peak performance.