VRT100-330D | 4800 PSI 1/2 NPT Unloader Valve Blue Spring Control

VRT100-330D Unloader Valve – Overview

The VRT100-330D unloader valve is a heavy-duty regulator engineered for stable pressure control at 4,800 PSI (330 bar). Its reinforced blue spring delivers precise, repeatable adjustments, while the trapped-pressure design automatically diverts flow to bypass the instant the trigger is released—protecting pumps, guns, hoses, and accessories from heat and pressure spikes. With rugged D-series construction and 1/2 in NPT female ports, it installs cleanly into contractor rigs, facility wash bays, and industrial systems that run hard all day.

What This Means for Your Rig

• Locks in stable pressure across changing tips, lances, and long hose runs.
• High-rate spring reduces chatter, vibration, and hose whip.
• Consistent feel across machines simplifies operator training.
• Fewer nuisance trip-outs and longer seal life for fleet managers.

Performance Specs

Quick Reference

• Max Pressure: 4,800 PSI (330 bar)
• Ports: Inlet / Outlet / Bypass – 1/2 in NPT female
• Spring: Reinforced blue spring; adjustable 330-bar regulation
• Function: Trapped-pressure unloader; automatic bypass on trigger release
• Temperature: Up to 194°F (90°C) typical
• Flow Capacity: Match to pump GPM for best stability

Build & Materials

• Reinforced D-series housing for continuous high-duty use.
• Precision valve stack and high-rate spring for smooth regulation.
• Metal NPT-female ports for repeatable torque and leak-resistant sealing.
• Clear port layout simplifies routing to gauges, reels, and bypass return lines.
• Service-friendly design with common VRT100 wear parts.

Benefits & Differentiators

• High-pressure stability in the 4,800 PSI class.
• Instant bypass reduces heat, water hammer, and seal wear.
• Easy integration with US-standard fittings via 1/2 in NPT ports.
• Smooth, incremental adjustment improves commissioning accuracy.
• Lower lifetime cost due to durable internals and common service kits.
• Consistent configuration for fleets and multi-rig operations.

Industries & Applications

• Industrial washers and plant wash bays
• Contractor cleaning rigs and mobile fleets
• High-duty wash stations and rental yards
• Municipal / public works equipment washdown
• Construction 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 if your system requires recirculation.
• Use high-pressure-rated thread sealants; verify torque on metal fittings.

Porting Standard

• All ports are 1/2 in NPT female.
• Use rated adapters when converting to BSP or quick-connect fittings.

Power Pairing

• Ideal for triplex pumps running up to 4,800 PSI.
• Integrate with thermal relief, inlet filtration, and a regulator/gauge tee.
• Use burst-rated hose, gun, lance, and wand assemblies.

Nozzle / Orifice Guidance

• Select orifice size based on pump GPM at target PSI.
• Adjust unloader only with trigger open and water flowing.
• Turbo nozzles create spikes—ensure all components meet or exceed pressure rating.

Setup, Service & Reliability

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

What’s Included

• VRT100-330D unloader valve with reinforced blue spring
• Inlet / Outlet / Bypass ports – 1/2 in NPT female
• 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 when using hot water or chemicals.