APCO Vacuum Relief/Air Inlet Valves (AVR)
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.
Vacuum Relief/Air Inlet Valves (AVR) Specifications
Cast iron, ductile iron, carbon steel, 316 stainless steel
ASME 125 and 250 class
3-36” (80-900 mm)