AR21350 | Stainless Unloader Valve 2900 PSI Corrosion Resistant

AR21350 | Stainless Unloader Valve 2900 PSI Corrosion Resistant

The Annovi Reverberi AR21350 VR-SS Stainless Unloader Valve is a premium
stainless steel pressure regulation solution engineered for cleaning systems that operate in the
harshest, most corrosive environments. Rated for up to 2,900 PSI, it provides
automatic bypass protection to safeguard the pump, protect the operator, and maintain long-term
system reliability. Unlike standard brass-bodied unloaders, the VR-SS features a full stainless
steel body and internals for exceptional corrosion resistance, making it ideal for marine work,
chemical processing plants, food and beverage facilities, and any application where moisture,
salt, and aggressive detergents are part of daily operation.

Built on AR’s proven VR series architecture and upgraded with stainless steel
construction, the AR21350 is designed to withstand continuous duty in demanding commercial and
industrial cleaning systems. Contractors and facility managers can rely on consistent,
repeatable performance even during long, punishing cleaning cycles.

Key Features

• Pressure rating: Handles up to 2,900 PSI for medium- to heavy-duty cleaning.
• Valve type: VR-SS stainless steel unloader with automatic bypass.
• Bypass function: Instantly diverts water to bypass when the spray trigger is released.
• Corrosion resistance: Full stainless steel body and internals resist rust and chemical attack.
• Connections: Standard threaded ports for quick, direct integration into compatible systems.
• Target applications: Marine cleaning, chemical plants, food & beverage, and industrial contractors.

Stainless Steel Construction

The defining feature of the AR21350 VR-SS is its all-stainless housing and internal
components. Where traditional unloaders rely on brass or composite housings, this model
is built specifically for installations where corrosion is a constant threat:

• Saltwater exposure: Ideal for shipyards, fishing fleets, offshore platforms, and dockside cleaning.
• Harsh chemicals: Withstands caustic washdowns and strong detergents in chemical processing or sanitation work.
• Sanitary environments: Stainless surfaces support hygiene requirements in food plants, dairies, and breweries.

This upgraded metallurgy delivers long-term reliability, reduces replacement frequency, and keeps
system performance consistent in places where standard brass valves corrode or seize prematurely.

How the VR-SS Unloader Works

The AR21350 functions as both a pressure regulator and an
automatic bypass safety valve:

• During normal operation, water flows through the valve to the spray gun or nozzle at the set pressure.
• When the operator releases the trigger, system pressure rises and the valve responds instantly by shifting to bypass.
• Flow is redirected back to the pump inlet or buffer tank, preventing overpressure damage and reducing stress on hoses and components.

This automatic cycling protects the pump from dangerous spikes, limits heat build-up during idle
periods, and contributes to longer service life for seals, pistons, and fittings.

Installation & Adjustment

• Connections: Stainless ports with standard female/male threading for quick mounting on compatible AR pumps and frames.
• Bypass routing: Always route the bypass line back to the pump inlet or a supply tank—never restrict or cap bypass flow.
• Pressure adjustment: Use the integrated adjustment screw to fine-tune system pressure within the valve’s rated range.
• Service-friendly: Straightforward plumbing and familiar VR-series layout minimize downtime for replacement or setup.

Applications

• Marine cleaning & shipyards: Hull, deck, and dock cleaning in constant saltwater exposure.
• Chemical processing plants: Systems exposed to caustic cleaners and aggressive rinse agents.
• Food & beverage facilities: CIP and washdown systems where stainless is preferred for sanitation.
• Pharmaceutical production: Environments requiring clean, corrosion-resistant components.
• Contractor rigs: Heavy-duty mobile washers using strong detergents on a daily basis.

Benefits

• Extended service life in corrosive, wet, or chemically aggressive environments.
• Reliable bypass performance that protects pumps, hoses, guns, and operators.
• Reduced maintenance costs due to stainless construction and robust VR-series design.
• Improved system uptime with smooth, predictable pressure regulation.
• Drop-in compatibility with many commercial and industrial cleaning systems.

AR21350 | Stainless Unloader Valve 2900 PSI Corrosion Resistant

• Model: AR21350 VR-SS Stainless Unloader Valve
• Maximum pressure: 2,900 PSI
• Flow capacity: Compatible with standard commercial system ranges (see pump datasheet for exact pairing).
• Valve type: VR-SS stainless steel unloader with automatic bypass.
• Construction: Full stainless steel body and internal components.
• Primary applications: Marine, chemical, food & beverage processing, and contractor rigs.

Bottom line: The AR21350 VR-SS Stainless Unloader Valve is the
premium choice when you need the corrosion resistance of stainless steel combined with the proven
reliability of Annovi Reverberi’s VR series. Built for harsh environments and heavy-duty use, it
delivers long-lasting pump protection, stable pressure regulation, and reduced downtime—making it
a smart, long-term investment for professional cleaning operations.