VB80-310-SS-NPT | 4500 PSI 316SS NPT Stainless Unloader Valve

VB80-310-SS-NPT – Unloader Valve – 4500 PSI – 316 Stainless Steel, NPT Connections

The Annovi Reverberi VB80-310-SS-NPT is a high-performance unloader valve engineered for heavy-duty commercial and industrial pressure washer systems. Rated for 4,500 PSI and 21 GPM, this stainless-steel valve provides stable pressure regulation, automatic bypass protection, and U.S.-standard NPT threading for seamless integration into North American cleaning equipment.

Built for Corrosion Resistance & Durability

Premium 316 Stainless Steel Construction

• Constructed entirely from 316 stainless steel for superior corrosion resistance.
• Designed for environments where brass or lower-grade metals quickly fail.
• Resists chloride attack, pitting, scaling, and chemical corrosion.

Ideal for Harsh & Demanding Environments

• Marine facilities and coastal wash systems exposed to saltwater.
• Chemical plants using strong detergents and solvents.
• Food and beverage processing requiring sanitary, non-reactive materials.
• Outdoor and high-humidity environments that accelerate corrosion.

Automatic Bypass Protection

Protects Pumps, Operators, and System Components

• Automatically diverts water flow into bypass when the spray trigger is released.
• Prevents destructive overpressure spikes that can crack pumps or rupture hoses.
• Reduces heat buildup during idle cycles, extending pump life.
• Improves operator safety with stable, predictable pressure regulation.
• Lowers maintenance costs by minimizing wear on seals and accessories.

NPT Connections for U.S. Compatibility

Direct Integration with North American Systems

• NPT-threaded ports eliminate the need for adapters or conversion fittings.
• Perfect for U.S.-standard contractor rigs, fleet equipment, and OEM machinery.
• 1″ NPT inlet and outlet support the full 21 GPM flow capacity.
• Reduces leak points and simplifies installation.

Precision Engineering & Serviceability

Reliable, Adjustable Performance

• Precision-machined internals ensure smooth pressure control.
• Fully adjustable regulation for dialing in exact system requirements.
• Rebuildable design with seals and internal kits available.
• Factory-tested for accuracy, bypass function, and long-term stability.

Shipping & Availability

Fast Delivery for Contractors & Industrial Teams

• Ships via UPS Ground within 24 hours under normal conditions.
• Peak-season processing typically 2–3 days.
• Widely supported through AR North America’s distribution network.

Why Choose the VB80-310-SS-NPT?

Key Advantages

• NPT-threaded for seamless U.S. system compatibility.
• Rated for 4,500 PSI and up to 21 GPM—ideal for high-flow rigs.
• 316 stainless steel construction for maximum corrosion resistance.
• Automatic bypass function ensures pump safety and longevity.
• Serviceable, rebuildable design for extended lifespan and reduced ownership costs.

Key Features & Specifications

Performance & Build

• Maximum Pressure: 4,500 PSI
• Flow Capacity: 21 GPM
• Construction: 316 stainless steel body and internals
• Connections: 1″ NPT inlet/outlet (U.S. standard)
• Function: Automatic bypass with adjustable pressure control

VB80-310-SS-NPT | 4500 PSI 316SS NPT Stainless Unloader Valve

Ideal Use Cases

• Marine and offshore pressure washing systems
• Industrial chemical plants and wash stations
• Contractor-grade multi-gun rigs and high-flow wash units
• Food and beverage CIP (Clean-In-Place) environments
• Heavy industrial facility and equipment cleaning