VRT100-330DD | 4800 PSI 1/2 NPT Dual-Port Unloader Valve Body

VRT100-330DD Unloader Valve – Overview

The VRT100-330DD unloader valve is a versatile dual-port regulator engineered for stable 4,800 PSI (330 bar) control in complex or high-duty pressure-washer builds. Its two 1/2 in NPT-female primary ports streamline parallel connections, gauge tees, chemical loops, and auxiliary accessories without extra manifolds. When the spray trigger is released, the valve instantly diverts flow to bypass, protecting pumps, hoses, guns, and downstream tools from heat and pressure spikes. For contractors, OEMs, and industrial facilities needing both performance and plumbing flexibility, the VRT100-330DD delivers clean installs, smooth regulation, and long service life.

What This Means for Your Rig

• Locks in your set pressure in the 4,800 PSI class—even with long hose runs or changing tips.
• Dual 1/2 in NPT-F ports reduce fittings, tees, and leak points.
• Blue-spring regulation minimizes chatter, hose whip, and operator fatigue.
• Smoother performance, simplified service, and fewer callbacks for fleet managers.

Performance Specs

Quick Reference

• Max Pressure: 4,800 PSI (330 bar)
• Primary Ports: Dual 1/2 in NPT female
• Bypass Port: 1/2 in NPT female
• Spring: Blue spring for 330-bar class; adjustable set pressure
• Function: Trapped-pressure unloader; automatic bypass on trigger release
• Temperature: Up to 194°F (90°C) typical
• Flow Capacity: Match to pump GPM for optimal stability

Build & Materials

• Reinforced body designed for continuous duty and high vibration environments.
• Precision valve stack provides smooth, incremental regulation.
• Metal NPT-female ports offer reliable torque and leak-resistant sealing.
• Dual-port layout reduces tees/adapters and speeds installation.
• Common VRT100 wear parts simplify preventive maintenance.

Benefits & Differentiators

• Dual-port flexibility for accessories, gauges, loops, or secondary circuits.
• Stable 4,800 PSI performance with blue-spring pressure class.
• Automatic bypass minimizes heat, water hammer, and seal wear.
• Cleaner plumbing with fewer joints and leak paths.
• US-standard NPT ports for fast integration.
• Durable internals and easy-to-source wear parts reduce downtime.

Industries & Applications

• Mobile wash trailers and contractor rigs
• Industrial wash bays and plant cleaning lines
• OEM pressure-washer builds needing compact plumbing
• Commercial facilities and fleet-wash operations
• Construction, rental yards, and heavy equipment cleaning
• Agriculture and food-equipment washdown (verify chemistry compatibility)

Compatibility & Fit

Mounting & Plumbing

• Install downstream of the pump and upstream of hose or reel.
• Route bypass to tank where recirculation is required.
• Use thread sealants rated for high-pressure water service; verify fitting torque.

Porting Standard

• Dual 1/2 in NPT-F primary ports.
• Dedicated 1/2 in NPT-F bypass return.
• Use rated adapters when converting to BSP or quick-connect systems.

Power Pairing

• Ideal for triplex pumps up to 4,800 PSI working pressure.
• Include thermal relief, inlet filtration, and a regulator/test gauge tee.
• Use burst-rated hose, guns, lances, and fittings.

Nozzle / Orifice Guidance

• Select spray tip orifice based on pump GPM at the target PSI.
• Adjust unloader only with water flowing (trigger open).
• Turbo nozzles create spikes—ensure all components exceed system PSI with margin.

Setup, Service & Reliability

• Prime system with clean water, purge air, and confirm supply.
• Adjust pressure only under flow to avoid over-pressure.
• Inspect inlet screens and strainers regularly.
• Watch for chatter or pressure creep—signs of contamination or wear.
• Service with VRT100 wear parts on a preventive schedule.
• Keep temperature, chemistry, and water quality within manufacturer limits.

What’s Included

• VRT100-330DD unloader valve with dual 1/2 in NPT-F ports (blue spring)
• Dedicated 1/2 in NPT-F bypass port
• Basic installation and setup instructions

Notes

• List any included adapters or plugs on your product page for installer accuracy.
• Confirm seal kit and temperature ratings when running hot-water or chemicals.