Overview
The Dixon AL 606 unloader valve is a compact, reliable pressure relief solution designed for hydraulic and pneumatic pump systems. This blue spring unloader automatically relieves pressure from the pump at shut-off, protecting equipment and reducing energy waste. With all-brass construction and female NPT connections, the AL 606 is a drop-in replacement for standard 3/8″ pump unloaders in pressure washers, hydraulic systems, and industrial applications.
Key Features
- Automatic pressure relief—shuts off pump flow when system pressure reaches set limit
- Blue spring design rated for 3650 PSI maximum operating pressure
- 3/8″ female NPT inlet and outlet connections for easy plumbing integration
- Dual bypass ports (2 × 3/8″ female NPT) for manifold mounting
- Brass body construction—corrosion-resistant and long-lasting
- Maximum operating temperature 190°F (88°C)
Technical Specifications
- Model: AL 606
- Type: Blue Spring Unloader Valve
- Pressure Rating: 3650 PSI maximum
- Flow Capacity: 8 GPM (gallons per minute) maximum
- Inlet Connection: 2 × 3/8″ Female NPT
- Outlet Connection: 3/8″ Female NPT
- Bypass Ports: 2 × 3/8″ Female NPT
- Body Material: Brass
- Spring Color: Blue
- Operating Temperature Range: 32°F to 190°F (0°C to 88°C)
- Connection Type: NPT (National Pipe Taper)
Typical Applications
- Pressure washer unloading systems
- Hydraulic pump protection and pressure regulation
- Pneumatic system pressure relief
- Mobile equipment hydraulic circuits
- General-purpose pump bypass and unloading
- Water processing and plumbing system manifolds
Compatibility & Replacements
Compatible With
- Dixon fluid control and manifold systems
- Standard 3/8″ NPT hydraulic and pneumatic plumbing
- Pressure washers with 8 GPM pump capacity
- Hydraulic systems operating below 3650 PSI
- Brass valve manifolds and aluminum pump heads
Replaces / Drop-In Replacement For
- Standard AL 606 unloader valves in all configurations
- Equivalent 3/8″ NPT female unloader valves from other manufacturers
- Legacy pump bypass valves with matching connection sizes
Works With
- NPT-threaded pump manifolds and valve blocks
- Brass and aluminum hydraulic system assemblies
- Industrial pressure relief and bypass plumbing networks
- Dixon Valve & Coupling hose assemblies and fittings
- Standard pressure washer pump platforms (8 GPM and below)
