PA VB135KDM Pressure Washer Unloader Valve 6.5 GPM 2600 PSI – OEM Replacement Part
Part Number: 3340
Category: Pressure Washer Parts → Unloader Valves → Pressure Washer Regulators
Type: PA VB135KDM Pressure Washer Unloader Valve
The PA VB135KDM Pressure Washer Unloader Valve (Part #3340) is a genuine OEM replacement unloader designed to provide reliable pressure regulation and pump protection for commercial and light industrial pressure washer systems. Manufactured by PA (P.A. SpA), this compact and durable unloader is rated for up to 2,600 PSI, 6.5 GPM, and operating temperatures up to 195°F.
Key Features & Benefits
- Genuine PA (P.A. SpA) OEM replacement unloader valve
- Rated up to 2,600 PSI
- Supports flow rates up to 6.5 GPM
- Automatically diverts water flow during trigger release
- Helps protect pumps and plumbing components
- Pressure-actuated design
- Compact and durable construction
- Suitable for hot and cold water pressure washers
- Reliable pressure regulation
- Commercial-grade performance
- Helps extend equipment lifespan
- Easy replacement for compatible systems
Technical Specifications
Part Number: 3340
Manufacturer: PA (P.A. SpA)
Model: VB135KDM (YVB135KDM)
Product Type: Pressure Washer Unloader Valve
Maximum Pressure: 2,600 PSI
Maximum Flow Rate: 6.5 GPM
Maximum Temperature: 195°F
Inlet Connection: 3/8" BSP-F
Outlet Connection: 1/4" BSP-M
OEM Replacement: Yes
What an Unloader Valve Does
The VB135KDM is designed to:
- Regulate operating pressure
- Divert water flow when the trigger gun is released
- Prevent excessive pressure buildup
- Protect pumps, hoses, and fittings
- Improve system reliability
- Extend pressure washer service life
When spraying stops, the unloader redirects water through the bypass circuit until demand resumes.
Common Applications
Pressure Washer Systems
Ideal for:
- Commercial pressure washers
- Mobile cleaning units
- Property maintenance equipment
- Contractor pressure washing systems
- Light industrial cleaning equipment
Cleaning Applications
- Equipment cleaning
- Building maintenance
- Vehicle washing
- Agricultural equipment cleaning
- General commercial cleaning
Performance Benefits
- Stable pressure regulation
- Improved pump protection
- Reduced component wear
- Consistent cleaning performance
- Reliable bypass operation
- Extended equipment lifespan
- Durable commercial-grade construction
- Reduced maintenance costs
Signs an Unloader Valve Needs Replacement
Replace the unloader if you notice:
- Pressure fluctuations
- Loss of operating pressure
- Water leakage around the valve
- Difficulty adjusting pressure
- Pump cycling issues
- Excessive bypass flow
- Reduced cleaning performance
- Worn internal components
Installation Notes
- Shut down the pressure washer and relieve all system pressure.
- Verify compatibility with your pump's flow and pressure ratings.
- Install using the proper BSP-threaded fittings.
- Apply thread sealant where required.
- Adjust pressure settings according to manufacturer recommendations.
- Test for proper operation and leaks.
- Verify consistent pressure performance before returning the system to service.
Important: Always ensure the pressure washer pump, hose, spray gun, and accessories are rated for the system's operating pressure and flow.
Maintenance Recommendations
- Inspect regularly for leaks and wear.
- Verify pressure settings during routine maintenance.
- Maintain clean water filtration systems.
- Check bypass performance periodically.
- Replace worn seals and internal components as needed.
- Follow PA maintenance recommendations.
