Spraying Systems 6815 Pressure Relief Valve 300 PSI 3/4"

Spraying Systems 6815-3/4-300 Pressure Relief Valve – 3/4", 0–300 PSI

The Spraying Systems 6815-3/4-300 Pressure Relief Valve is an adjustable brass pressure relief and regulating valve designed to control line pressure in spraying systems. It helps maintain the desired operating pressure by directing excess liquid back to the supply tank or pump inlet, reducing unnecessary liquid waste.

This valve features a 3/4-inch male NPT inlet, a 3/4-inch female NPT outlet, and an adjustable pressure range of 0–300 PSI. Its brass construction and serviceable internal components make it a practical choice for professional spray equipment.

Features & Benefits

• Adjustable Pressure Control: Regulates system pressure within a 0–300 PSI operating range.
• Pressure Relief Function: Returns excess liquid to the supply tank or pump inlet.
• Brass Construction: Durable metal valve body for spray system plumbing.
• 3/4" NPT Connections: Male inlet and female outlet.
• Serviceable Design: Internal wear components can be replaced using a compatible repair kit.

Specifications

Adjusting the Relief Pressure

Loosen the lock nut, then turn the adjustment stem to increase or decrease the relief pressure. Tightening the adjustment increases the pressure setting, while loosening it decreases the setting. Retighten the lock nut after adjustment. Use a pressure gauge to verify the setting, and do not exceed the pressure rating of the valve or other system components.

Repair Kit & Parts Diagram

This valve is rebuildable with the appropriate 300 PSI repair kit.

• Shop Spraying Systems PK6815-300 Pressure Relief Valve Repair Kit
• View Manufacturer 6815-300 Exploded Parts Diagram (PDF)