K3.0E Pressure Washer Unloader Valve 2.1–3.0 GPM 400–1450 PSI – OEM Replacement Part
Part Number: 2347
Category: Pressure Washer Parts → Unloader Valves → Flow Actuated Unloader Valves
Type: General Pump K3.0E Pressure Washer Unloader Valve
The General Pump K3.0E Pressure Washer Unloader Valve (Part #2347) is a genuine OEM replacement flow-actuated unloader valve designed for pressure washer systems operating between 2.1 and 3.0 GPM with adjustable pressures from 400 to 1,450 PSI. Manufactured by General Pump, the K3.0E provides reliable pressure regulation and smooth bypass operation while protecting pumps and system components from excessive pressure buildup.
Key Features & Benefits
- Genuine General Pump OEM replacement unloader valve
- Flow-actuated balanced piston design
- Designed for 2.1–3.0 GPM pressure washer systems
- Adjustable pressure range from 400–1,450 PSI
- Maximum operating pressure of 1,450 PSI
- Balanced nozzle design reduces pressure spikes
- Smooth transition between spray and bypass modes
- Stainless steel and brass internal components
- Dual gauge ports for easy pressure monitoring
- Helps extend pump and component life
- Durable commercial-grade construction
- OEM-quality fit and performance
Technical Specifications
Part Number: 2347
Manufacturer: General Pump
Model: K3.0E
Product Type: Flow Actuated Unloader Valve
Flow Range: 2.1–3.0 GPM
Pressure Adjustment Range: 400–1,450 PSI
Maximum Pressure: 1,450 PSI
Maximum Temperature: 195°F
Inlet Connection: 3/8" BSP-F
Outlet Connection: 3/8" BSP-M
Bypass Connection: 3/4" BSP-M
Operation Type: Flow Actuated
Gauge Ports: Dual
OEM Replacement: Yes
How the K3.0E Works
The K3.0E uses a flow-actuated balanced piston design to regulate pressure.
When the spray gun is open:
- Water flows normally through the valve.
- The piston remains in the operating position.
- Full system pressure is delivered to the spray nozzle.
When the spray gun is closed:
- Water flow stops.
- Pressure rises downstream of the internal orifice.
- The balanced piston shifts automatically.
- Water is diverted through the bypass port.
- Pressure spikes are minimized, protecting the pump and plumbing.
This balanced design provides smoother operation than many conventional unloader valves and reduces stress on the entire pressure washer system.
Common Applications
Residential & Commercial Pressure Washers
Ideal for:
- Residential pressure washers
- Portable pressure washer systems
- Light commercial cleaning equipment
- Vehicle washing
- Property maintenance
Industrial Cleaning Equipment
Suitable for:
- Equipment wash stations
- Agricultural cleaning
- Maintenance departments
- Small industrial cleaning systems
- Custom pressure washer builds
Performance Benefits
- Precise pressure adjustment
- Smooth bypass operation
- Reduced pressure spikes
- Improved pump protection
- Consistent cleaning performance
- Extended equipment lifespan
- Lower maintenance costs
- Reliable long-term operation
Signs an Unloader Valve Needs Replacement
Inspect or replace the unloader if you notice:
- Pressure fluctuations
- Reduced cleaning pressure
- Water leakage around the valve
- Difficulty adjusting pressure
- Inconsistent bypass operation
- Delayed trigger response
- Excessive internal wear
Installation Notes
- Verify compatibility with your system's flow and pressure requirements.
- Install using the appropriate BSP fittings and thread sealant.
- Connect the inlet, outlet, and bypass ports according to the system layout.
- Install a pressure gauge using one of the gauge ports for accurate adjustment.
- Set the operating pressure using a calibrated pressure gauge.
- Ensure a minimum 5% bypass flow is maintained for proper operation.
Important: Verify that all pressure washer components—including pumps, hoses, spray guns, and fittings—are rated for the intended operating pressure before placing the system into service.
Maintenance Recommendations
- Inspect the valve regularly for leaks and wear.
- Verify pressure settings during scheduled maintenance.
- Keep inlet water filtration clean.
- Maintain the recommended minimum bypass flow.
- Replace worn seals or internal components using the appropriate OEM repair kit.
- Follow General Pump's recommended maintenance schedule.
