MV500 | Safety Relief Valve, 3500 PSI, 1/4 in NPT Inlet

MV500 Safety Relief Valve Overview

The AR MV500 safety relief valve is a compact, precision-machined overpressure protection component designed to safeguard pumps, hoses, seals, and fittings in high-pressure cleaning and fluid-handling systems up to 3,500 PSI. Engineered to open at a preset limit and automatically reseat when pressure returns to normal, it provides a dependable final layer of system protection without requiring operator adjustment.

Featuring a 1/4 in NPT inlet and corrosion-resistant brass construction with stainless-steel internal components, the MV500 delivers reliable, repeatable performance in both portable and stationary equipment.

Key Features

• 3,500 PSI factory-set relief rating
• 1/4 in NPT inlet for universal compatibility
• Automatic opening and reseating under pressure spikes
• Corrosion-resistant brass body with stainless-steel spring and internals
• Protects pumps, hoses, seals, and fittings from overpressure damage
• Compact size ideal for tight manifolds and confined system layouts
• Precision-machined seat ensures accurate crack pressure and clean reseating

Construction & Durability

Built from heavy-duty brass with stainless-steel internals, the MV500 resists corrosion, deformation, and galling while maintaining long-term relief accuracy. Its robust construction ensures reliability in harsh commercial environments subjected to vibration, temperature changes, and frequent cycling.

Durability Benefits

• Brass body withstands chemical exposure and thermal variation
• Stainless-steel spring maintains tension across repeated cycles
• Precision-ground internal seat minimizes wear and leakage
• All-metal construction prevents cracking or thread failure

Performance & Operation

The MV500 functions as an automatic overpressure safeguard: when system pressure exceeds the preset limit, it opens momentarily to vent excess pressure, then closes cleanly to restore line integrity. This protects critical components from damage caused by nozzle blockages, hose pinches, gun failures, or unloader mis-adjustments.

Performance Advantages

• Fast, controlled venting during pressure spikes
• Stable reseating ensures no loss of operating pressure
• Minimizes equipment fatigue and premature seal wear
• Operates effectively in hot- or cold-water systems within rated limits

Installation & Compatibility

The 1/4 in NPT male inlet threads directly into pump heads, manifolds, relief ports, or auxiliary tees. Its compact form allows installation in tight locations such as mobile wash units, wall-mounted systems, and enclosed equipment cabinets.

Installation Highlights

• Simple thread-in design using standard 1/4 in NPT fittings
• Compact footprint supports dense plumbing configurations
• Requires no calibration—factory preset for reliability
• Discharge should be routed safely with minimal backpressure

Maintenance

Routine care is minimal. Inspecting the valve periodically and ensuring the discharge path remains clear helps maintain consistent relief behavior. Systems exposed to hard water or heavy use may benefit from occasional flushing to prevent scale buildup.

Maintenance Tips

• Inspect relief opening for debris or scale buildup
• Verify clear discharge pathway for proper venting
• Flush systems periodically if mineral deposits are present
• Check for leaks or pressure irregularities during service intervals

MV500 | Safety Relief Valve, 3500 PSI, 1/4 in NPT Inlet

Applications

• Pressure washers and industrial wash systems
• Car wash manifolds and pump stations
• Agricultural sprayers and fluid-delivery systems
• Portable wash rigs and compact industrial skids
• Any high-pressure system requiring overpressure protection

Professional Advantages

The AR MV500 provides reliable, maintenance-light overpressure protection that helps prevent burst hoses, seal failures, and pump damage. Its automatic reseating, durable brass construction, and precise relief performance make it an essential safeguard for ensuring safe, efficient system operation in demanding environments.