VLP17.21 | Pressure Relief Valve 4060 PSI 4.5–5.6 GPM Range

VLP17.21 – Pressure Relief Valve – 4,060 PSI – 4.5–5.6 GPM

Overview

The Annovi Reverberi VLP17.21 Pressure Relief Valve is a heavy-duty safety component
engineered to protect commercial and industrial pressure washer systems operating at
4,060 PSI with a flow range of 4.5–5.6 GPM. Designed for high-output
cleaning environments, this valve automatically releases excess system pressure before it can
cause damage, ensuring safe, stable, and reliable operation during demanding cleaning tasks.

Unlike unloaders, which regulate pressure during normal operation, a pressure relief valve
serves as a fail-safe protection device. The VLP17.21 activates only when system
pressure exceeds safe limits—such as during a clogged nozzle, sudden trigger shutoff, thermal
expansion, or flow restriction—preventing catastrophic failures that can damage pumps, hoses,
spray guns, and fittings.

Built to Annovi Reverberi’s professional standards, the VLP17.21 is a critical component for
contractors, industrial facilities, fleet maintenance operations, and municipal systems that
run high-pressure equipment for extended periods and cannot afford unplanned downtime or safety
risks.

Why the VLP17.21 Is Essential

• Specifically designed for larger-capacity pressure washer systems used in commercial and industrial applications.
• Prevents dangerous pressure surges caused by clogged nozzles, closed valves, or sudden trigger release.
• Protects pumps from cracked housings, overheated seals, and premature mechanical failure.
• Acts as a secondary safety layer alongside unloaders and regulators.
• Extends overall system life and reduces costly repair-related downtime.

In high-output systems, pressure spikes can develop instantly and without warning. Even a brief
overpressure event can cause permanent damage to a pump or lead to hose rupture. The VLP17.21
is engineered to respond immediately when pressure exceeds its set threshold, venting excess
pressure before damage occurs.

How the Pressure Relief Valve Works

• Remains closed during normal operating pressure.
• Opens automatically when system pressure exceeds 4,060 PSI.
• Diverts excess or overheated water out of the system.
• Restores pressure to a safe operating range.
• Provides continuous overpressure protection during heavy-duty operation.

This automatic action requires no operator input and functions independently of the unloader
valve. In the event of an unloader failure or abnormal system condition, the VLP17.21 becomes
the last line of defense, protecting both equipment and personnel.

Robust Construction & Reliability

• Precision-machined housing ensures accurate pressure response and leak-free operation.
• Reinforced internal components withstand repetitive high-pressure cycling.
• Corrosion-resistant materials handle water, detergents, and common cleaning chemicals.
• Designed for both outdoor contractor rigs and indoor industrial installations.
• Built for long service life with minimal maintenance requirements.

The VLP17.21 is engineered to operate reliably in harsh environments where vibration, moisture,
temperature fluctuations, and chemical exposure are common. Its rugged internal design ensures
consistent performance even after thousands of pressure relief cycles, making it suitable for
daily professional use.

Flow Capacity & System Compatibility

• Optimized for systems operating between 4.5 and 5.6 GPM.
• Ideal for higher-output pressure washers that exceed residential or light commercial capacity.
• Provides pressure relief without restricting normal system flow.
• Calibrated to vent only when necessary—no premature pressure loss.

Proper flow matching is critical for pressure relief valves. The VLP17.21 is carefully tuned to
activate only under unsafe pressure conditions while allowing full flow during normal operation.
This ensures that cleaning performance is not compromised while maintaining maximum protection.

Applications

• Commercial pressure washers operating for extended daily cycles.
• Industrial cleaning facilities handling large equipment, floors, and surfaces.
• Fleet washing stations for trucks, buses, trailers, and heavy machinery.
• Municipal maintenance systems used by cities and public works departments.
• Contractor rigs exposed to varying water supply and jobsite conditions.

In these environments, equipment reliability and operator safety are paramount. The VLP17.21
provides peace of mind by ensuring that unexpected pressure events do not result in costly or
dangerous failures.

Key Features & Specifications

• Maximum Pressure: 4,060 PSI
• Flow Range: 4.5–5.6 GPM
• Construction: Corrosion-resistant housing and reinforced internals
• Function: Automatic overpressure relief
• Response: Fast-acting safety protection
• Applications: Contractor rigs, industrial systems, fleet washing, municipal cleaning

Benefits for Operators & Facilities

• Pump & Hose Protection: Prevents damage from sudden pressure spikes.
• Extended Equipment Life: Reduces stress on seals, valves, and internal components.
• Operator Safety: Minimizes risk of hose whip, fitting failure, and blowouts.
• Durability: Resistant to corrosion, chemicals, and heavy-duty use.
• Operational Efficiency: Keeps high-flow systems running smoothly with minimal downtime.

For facilities managing multiple pressure washer systems, the cost of a failed pump or burst hose
far exceeds the investment in proper safety components. The VLP17.21 helps protect capital
equipment while reducing maintenance labor and unexpected shutdowns.

Summary

The Annovi Reverberi VLP17.21 Pressure Relief Valve is a professional-grade safety
solution rated at 4,060 PSI and optimized for systems flowing
4.5–5.6 GPM. Designed for commercial and industrial pressure washing setups, it
provides automatic overpressure protection, extends equipment life, and enhances operator safety
under demanding conditions.

For contractors, facility managers, and industrial operators seeking dependable protection for
higher-output systems, the VLP17.21 delivers proven performance, rugged durability, and the peace
of mind that comes from knowing your equipment is protected against unexpected pressure events.