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Automatic vent valves solves the following air problems in water mains.
- Exhaustion of air when the main is being filled and to close when the pipe is full to prevent loss of water.
Also to open and admit air to break the onset of vacuum in the pipe during hydraulic transients.
- To release air which had been dissolved in the liquid under standard operating conditions.
Single air valves serve both purpose and are sized with orifices for either (1) and (2), but not both.
A proper size selection is important to prevent overpressures, vacuum and pockets of air in pipeline and then not reduce pipeline capacity and efficiency of the line.
Nencini designs and manufactures also an anti-slam device, to assemble upstream the air valve and perform a slow closing, where operating conditions cause a regular floater to slam shut.
The main data on this type of valve follows:
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| Medium |
Water (drinking, corrosive, waste) |
| Features |
Large air flow capacities; compact assemblies; simple and robust construction; proven efficiency; easy maintenance and minimal servicing. |
| Application |
On all pipeline high points and changes in grade; on long ascending/descending stretch at 500 to 700 meters intervals; on all pipeline critical points to prevent vacuums from forming. |
| Size |
From DN50 to DN600 (from 2" to 24") |
| Pressure Class |
From PN10 to PN100 (from ANSI125 to ANSI600) |
| Flanges |
According to main National and International Standards
(ANSI, ISO, BS, DIN, ...) |
| Materials |
Body in: Cast Iron, Cast Steel, Aluminum Bronze
Trim in: Stainless Steel; Aluminum Bronze; Hastelloy; Rubber Lined |
| Coating |
Any type of required painting cycle. |
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