Air & Vacuum Release
These Original Air and Vacuum Valves (AL Series) are designed to exhaust large quantities of air when filling pipelines, and to allow air to re-enter pipelines when draining to prevent collapse due to vacuum formation.
Deep Well Air Valves have an adjustable top which controls the velocity of air discharged from the valve. It also helps prevent chatter, and premature closure of the valve mounted on the discharge side of the pump.
The VR Valve allows air to enter a system when a negative pressure occurs, but prevents air from being released under postive conditions, except through an optional small orifice Air Release Valve.