Unloader Valve – LWD / TP / RCV

Part Number: 85.300.003
Category: Pressure Washer Replacement Parts
Type: Unloader Valve

The Unloader Valve – LWD / TP / RCV is a key pressure regulation component for pressure washer systems. It controls and redirects water flow when the spray gun trigger is closed, helping to maintain safe operating pressure and protect the pump and downstream components from excessive stress.

Designed for reliability in daily use, this unloader valve supports consistent performance across a wide variety of commercial, industrial, and residential pressure washer applications.

Key Functions

• Pressure Regulation
  Maintains system pressure by diverting flow when the trigger gun is shut, helping avoid pump stress and pressure spikes.

• Bypass Flow Control
  Redirects water back to the inlet or bypass loop to relieve pressure and reduce heat buildup in the pump.

• Pump Protection
  Prevents “dead-heading” conditions that can lead to internal damage, premature wear, or seal failure.

• Smooth Operation
  Helps ensure stable pressure transitions between spraying and bypass modes for consistent cleaning performance.

Compatibility & Use

This unloader valve is compatible with pressure washer systems requiring a regulated bypass valve for pressure control. It is often used as a replacement or upgrade for OEM unloader valves in systems identified by LWD, TP, or RCV style references.

Before installation, verify compatibility with your specific pressure washer model and pump type to ensure proper fit and function.

Specifications

Note: Specific pressure adjustment range, thread sizes, and flow characteristics vary by system and are not provided here. When available, official manufacturer specs can be added.

Why This Unloader Valve Matters

An unloader valve helps protect your pressure washer pump by:

• Preventing excessive pressure when the trigger gun is closed

• Reducing internal heat and stress during bypass

• Extending seal and component life

• Improving overall system performance and reliability

Without an effective unloader valve, pumps can experience rapid wear, overheating, and failure due to uncontrolled high-pressure conditions.

Installation Overview

1. Power off and depressurize the pressure washer (trigger the gun until flow stops).

2. Disconnect water supply and hose connections.

3. Remove the old unloader valve following the manufacturer’s guidance.

4. Install the new valve in the same orientation, ensuring proper thread engagement and seal seating.

5. Reconnect hose and pressure lines.

6. Test at low pressure, then adjust as needed per your pressure washer’s adjustment instructions.

Always refer to your pump or pressure washer OEM manual for detailed instructions, torque values, and safety recommendations.