Air Release Valves:
An Air Release Valve is used to eliminate small air pockets that form at the high points of a pipeline and restrict flow. Air pockets reduce pipeline capacity and increase the amount of energy required to pump fluids. DeZURIK manufactures three main styles of APCO Air Release Valves:
Air Vacuum Valves:
Air/Vacuum Valve are used to protect pipelines from damage by expelling or admitting large quantities of air. Air/Vacuum Valves expel air when filling the pipeline and admit air to relieve a vacuum when draining the pipeline. DeZURIK manufactures two main styles of APCO Air Vacuum Valves:
Combination Air Valves:
Combination Air Valves combine the functions of both an Air/Vacuum Valve with an Air Release Valve. Combination Air Valves, in either single to dual body types, are typically installed on all high points of a system where it has been determined that the functions of both an Air/Vacuum Valve and an Air Release Valve are needed to vent and protect a pipeline. DeZURIK manufactures four main styles of APCO Combination Air Valves:
- ASU Single Body Combination Air Valves
- AVV Dual Body Combination Air Valves
- ASC Single Body Sewage Combination Air Valves
- ASD Dual Body Sewage Combination Air Valves
Vacuum Relief/Air Inlet Valves:
Vacuum Relief/Air Inlet Valves are normally closed. If the system pressure becomes negative, the Vacuum Relief/Air Inlet Valve will immediately admit air into the system and prevent a vacuum from forming. When system pressure returns to positive, the Vacuum Relief/Air Inlet Valve closes air tight.
Surge Check Valves:
A Surge Check Valve is used to prevent critical shock conditions from occurring in installations where the operating conditions cause a regular air valve to slam open and/or closed. The Surge Check Valve reduces the rate of flow of water into the air valve by means of throttling orifices in the disc, thereby preventing water hammer. This Surge Check Valve provides this slow closing feature and is mounted on the inlet of the Air/Vacuum Valve.
Double Acting Throttling Device:
Air/Vacuum Valves can efficiently discharge air from deep well pump columns when combined with a Double Acting Throttling Device. The Double Acting Throttling Device is fitted on the discharge orifice of the Air/Vacuum Valve. Because the pipeline media does not contact the Double Acting Throttling Device, it can be used on pipelines containing dirty fluids.
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