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YUW21235 White Spring Pressure Washer Unloader Valve 21 GPM 2200 PSI – OEM Replacement Part

by PA
Original price $160.00 - Original price $160.00
Original price
$160.00
$160.00 - $160.00
Current price $160.00

Part Number: 6966
Category: Pressure Washer Parts → Unloader Valves → Pressure Actuated Unloader Valves
Type: PA YUW21235 White Spring Unloader Valve


The PA YUW21235 White Spring Unloader Valve (Part #6966) is a heavy-duty OEM replacement pressure-actuated unloader designed for high-volume pressure washer systems operating up to 21 GPM and 2,200 PSI. Built for commercial, industrial, agricultural, and multi-gun cleaning applications, this unloader provides dependable pressure regulation, efficient bypass operation, and reliable pump protection under demanding operating conditions.


Key Features & Benefits

  • Genuine PA OEM replacement unloader valve
  • High-flow capacity up to 21 GPM
  • Maximum operating pressure of 2,200 PSI
  • Pressure-actuated bypass operation
  • White spring configuration
  • Heavy-duty brass and stainless steel construction
  • Designed for commercial and industrial pressure washer systems
  • Protects pumps and plumbing components from pressure buildup
  • Maintains stable operating pressure
  • Suitable for multi-gun cleaning systems
  • High-temperature rating up to 200°F
  • Long service life and reliable operation

Technical Specifications

Part Number: 6966

Manufacturer: PA (PA S.p.A.)

Model: YUW21235

Product Type: Pressure Actuated Unloader Valve

Maximum Flow Rate: 21 GPM

Maximum Pressure: 2,200 PSI

Maximum Temperature: 200°F

Inlet Connections: Dual 1/2" FPT

Outlet Connection: 1/2" FPT

Bypass Connection: 1/2" FPT

Spring Color: White

Operation Type: Pressure Actuated

OEM Replacement: Yes


How a Pressure Actuated Unloader Works

The YUW21235 automatically regulates system pressure by redirecting water flow when the spray gun is closed.

When the trigger gun is released:

  • System pressure rises
  • The internal unloader mechanism activates
  • Water is diverted into the bypass circuit
  • Pump overload conditions are prevented
  • System components are protected from pressure spikes

When the trigger gun is reopened:

  • Water flow is restored to the discharge line
  • Operating pressure quickly returns
  • Cleaning performance resumes immediately

Designed for High-Flow Systems

With a 21 GPM capacity, the YUW21235 is ideal for:

  • Multi-gun pressure washer systems
  • Industrial wash bays
  • Agricultural cleaning equipment
  • Fleet washing operations
  • Heavy equipment cleaning
  • Centralized cleaning systems
  • Manufacturing facilities
  • Food processing wash-down systems

Its high-flow design allows it to efficiently manage large-volume water systems while maintaining consistent pressure control.


Performance Benefits

  • Reliable pressure regulation
  • Smooth bypass operation
  • Improved pump protection
  • Reduced component wear
  • Stable operating pressure
  • Consistent cleaning performance
  • High-volume water handling capability
  • Extended equipment lifespan

Common Applications

Commercial Pressure Washing

Ideal for:

  • Fleet washing
  • Truck washing
  • Equipment cleaning
  • Agricultural operations
  • Industrial maintenance

Industrial Cleaning Systems

Suitable for:

  • Manufacturing facilities
  • Food processing plants
  • Processing equipment wash-down
  • Municipal maintenance operations
  • Multi-operator cleaning stations

Signs an Unloader Valve Needs Replacement

Replace the valve if you notice:

  • Pressure fluctuations
  • Unstable bypass operation
  • Reduced cleaning pressure
  • Water leakage
  • Inconsistent trigger response
  • Excessive pressure spikes
  • Internal corrosion or wear

Installation Notes

  1. Verify compatibility with system flow and pressure requirements.
  2. Install using proper thread sealant on all connections.
  3. Ensure bypass plumbing is correctly routed.
  4. Inspect fittings and hoses before startup.
  5. Adjust pressure according to equipment specifications if applicable.
  6. Test system operation after installation.

Important: Always ensure pumps, hoses, spray guns, and fittings are rated for the intended operating pressure and flow requirements.


Maintenance Recommendations

  • Inspect regularly for leaks and wear.
  • Verify bypass operation periodically.
  • Maintain clean inlet water filtration.
  • Monitor system pressure during operation.
  • Replace worn internal components as necessary.
  • Service the unloader during routine pressure washer maintenance.

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