Product Description
Air Release / Vacuum Relief Valves
Air Release / Vacuum Relief Valves provide vital protection to pipeline systems. They allow air to escape during system startup by preventing air restrictions, water hammer caused by large air masses, inaccurate flow meter readings, and explosive conditions from air being compressed by water.
They also allow air to enter the pipeline during valve closure or system shutdown. This minimizes the collapse of mainline and submain pipes, back siphonage of dirt into emitters, and water hammer caused by sudden reversal of flows.
• Dual Acting Air Release/Vacuum Relief Valve
• 80 psi working pressure
• Inlet 3/4” and 1” npt
• Seals at 5 psi
• Clear open diameter is 0.610”
Why air release / vacuum relief valves are needed on all sprinkler and drip / micro systems
The air release feature allows air to escape the pipeline during system startup. This prevents:
a. Air restrictions (air locks) in pipelines, which can partially or completely block waterflow.
b. Water hammer caused by large air masses which would otherwise remain in the pipe during and after startup.
c. Inaccurate flow meter readings
d. Explosive condition from air being compressed by water
The vacuum relief feature allows air to enter the pipeline during valve closure or system shutdown.This minimizes:
a. Collapse of mainline and submain pipes due to a vacuum.
b. Back siphonage of dirt into emitters. Vacuum relief valves can reduce this problem, but in some configurations will not eliminate it. See special notes on this subject.
c. Water hammer caused by a sudden reversal of flows which can occur if a negative pressure (vacuum) exists downstream of a valve that was just closed.
