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This is a valve that you may hear hissing if it's working. The deep-well AVC below does not use copper tubing, all it's parts are self-contained. US Gauge & Similar Type 310WJ, Type 300SL, or Type 6 Rectangular Air Volume Controls = Excess Air Vents The hole seen in the end of the brass screw is the air inlet for this air volume control. The alternative air volume control shown below does not include a disc-shaped device and has no connection to the water system's The AVC may also be located right on top of a one line or two line jet pump such as is visible at the top center in our Meyers™ well pump photo at left. The air volume control might be found on the side of the water tank (above left) and is typically connected to the water pump itself (above right) by a flexible copper tube. The tube connecting the AVC to the pumping chamber suction side provides the pressure drop that pulls on a diaphragm on the AVC that in turn causes the AVC to draw in its air charge. Used on jet pump water supply systems, on each pump "on" cycle the AVC draws in a small volume of air that is then pushed onwards into the water pressure tank. To the tank, or perhaps on the side of the tank with a plastic or copper tube connecting the disc to a fitting on the tank or nearby piping, this is the AVC. If you see a round steel disc of about 4" diameter and about 1" thick on the water tank, mounted perhaps at the middle of the tank height or at the water outlet The tank from time to time as water pressure cycles up and down, that is, each time that the water pump runs. The AVC is intended to automatically put a little bit of replacement air into Round Air Volume Control Devices With Copper TubeĪn "automatic" air volume control (AVC) device may be installed on the water pressure tank if it's an older, bladderless steel tank. The water pump turning on and off rapidly - "short cycling" of the water pump. If a water tank loses its air charge it stops working properly and usually results in The air volume control or "AVC" device mounted (usually) on older steel water tanks (ones that do not useĪn internal bladder to keep water and air separate) is designed to automatically add air to the water pressure tank The job of the AVC is to keep air in the water tank to avoid waterlogged water tanks or well pump short cycling.
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This means that the tank is full or nearly full of water. In water pressure tanks that do not use an internal bladder, over time, the air in the tank willīe absorbed into the water and the tank will become ‘waterlogged’.
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Water Tank AVCs Air Volume Controls - Defined, How they Work, How to Use We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. We describe what AVCs look like, we explain the types of air volume controls used on jet pumps and on submersible pumps, and we describe where to find them, and how these devices work, and how they can be repaired, replaced or just abandoned. This article describes water tank air volume controls (AVCs) used to keep a proper air charge in a water pressure tank and thus avoid well pump turning on and off to frequently. Guide to air volume controls on water tanks: We have no relationship with advertisers, products, or services discussed at this website. InspectAPedia tolerates no conflicts of interest.