VRT100-330K-R | 4800 PSI 1/2 NPT Unloader Valve Assembly

VRT100-330K-R – High-Pressure Unloader Valve

The VRT100-330K-R unloader valve is the retail-packaged version of the high-pressure VRT100 platform, engineered for stable regulation at 4,800 PSI (330 bar). Tuned with a blue spring and an adjustable control knob, it diverts flow to bypass instantly when the trigger is released—protecting pumps, hoses, guns, and accessories from pressure spikes and heat buildup. Featuring 1/2″ NPT female ports and rugged construction, it installs cleanly as a dependable replacement for contractor rigs, industrial washers, and facility wash systems.

What This Means for Your Rig

At 4,800 PSI, you need an unloader that maintains your set pressure across changing nozzles, hose runs, and operator demands. The VRT100-330K-R’s high-rate blue spring ensures steady output, reducing chatter, hose whip, and seal wear. Its retail packaging improves counter identification and speeds field replacement—minimizing downtime and keeping crews productive.

Performance Specs (Quick Reference)

• Max Pressure: 4,800 PSI (330 bar)
• Ports / Connections: Inlet, Outlet, Bypass — 1/2″ NPT female
• Spring / Control: Blue spring with manual control knob
• Function: Trapped-pressure unloader with automatic bypass
• Temperature: Up to 194°F (90°C)
• Flow Capacity: Match to pump GPM for ideal performance

Build & Materials (Made to Last)

• Reinforced housing for industrial durability
• Precision valve stack for smooth, stable pressure modulation
• High-rate blue spring for consistent regulation in the 4,800 PSI class
• Metal NPT-female ports for repeatable torque and reliable sealing
• Service-friendly design with commonly available VRT100 wear parts

Benefits & Differentiators

• Retail-ready packaging for quick identification and replacement
• High-pressure stability with minimal pressure oscillation
• Protects pumps and hoses from heat, spikes, and water hammer
• Clean, easy plumbing with US-standard 1/2″ NPT ports
• Fast setup with predictable, repeatable control-knob adjustments
• Lower long-term cost through durable internals and easy service

Industries & Applications

• Professional contractor fleets and replacement markets
• Industrial washers and plant wash bays
• Commercial facilities and maintenance departments
• Municipal and public works washdown
• Construction equipment and heavy-duty cleaning
• Agriculture/food processing (verify chemical compatibility)

Compatibility & Fit

• Plumbing: Install downstream of the pump, upstream of hose or reel
• Bypass routing: Return to tank when heat management is required
• Porting: 1/2″ NPT female; use rated adapters for BSP/QC systems
• Pump pairing: Ideal for triplex pumps up to 4,800 PSI
• Nozzle selection: Use an orifice matched to pump GPM and target PSI
• Turbo nozzle use: Ensure all components meet or exceed system pressure

Setup, Service & Reliability

• Prime with clean water and purge all air before startup
• Adjust pressure only with the trigger pulled
• Check strainers and inlet screens regularly
• Watch for chatter, pressure creep, or oscillation—signs of wear or contamination
• Service using standard VRT100 wear parts for consistent performance
• Keep temperature, chemistry, and water quality within manufacturer limits

What’s Included VRT100-330K-R

• VRT100-330K-R unloader valve (retail-packaged)
• Blue-spring regulation with manual control knob
• 1/2″ NPT-female inlet, outlet, and bypass ports
• Basic installation and setup guidance

Notes

• List any included adapters or plugs on your product page for installer clarity.
• Confirm seal kit and temperature limits for hot-water or chemical applications.