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APCO Vacuum Relief/Air Inlet Valves (AVR)


Technical Information

Vacuum Relief/Air Inlet Valves are normally closed valves.


When the system pressure becomes negative, the valve opens, allowing air into the system to prevent a vacuum from building.


When system pressure returns to positive, the Vacuum Relief/Air Inlet Valve closes air tight.


Standard Vacuum Relief/Air Inlet Valves are designed to open with a minimal, 1/4 psi pressure differential across the orifice. 


Higher or lower relief settings are available to suit the application.

Body material:
Cast iron, ductile iron, carbon steel, 316 stainless steel


Body styles:
Series 1500


Pressure rating:
ASME 125 and 250 class


Size rage:
3-36” (80-900 mm)