AVM COMPACT AIR VALVE
OPTIONS:
- AVM Compact Air Valve with Surge Arrester
- AVM Sewage Compact Air Valve
- Size Range and Pressure:
- DN 50 up to DN 400 as standard
- DN25 (1”) as single orifice small size air valve with threaded end connection.
- Applicable Standards:
- Flanges to EN 1092-2 (ex DIN 2501, ISO 2531, BS 4504, ISO 7005-2)
- Flanges to ANSI 125/150 – ANSI 300
- Corrosion Protection
- Coating: Fusion Bonded Epoxy (FBE)
- Dry Film Thickness: 250 µm
- Colour: Blue, ca. RAL 5005
APPLICATIONS:
- For all kind of pipelines.
COMPACT AIR VALVES FUNCTIONS:
When a pipeline is drained, vacuum can occur unless air is permitted to get into the pipeline.
Even if the whole pipeline is drained; there is column separation at peek points of the pipelines, which mean the water falls down by gravity to both directions at peak point. If there is no air valve at such peak points, vacuum occurs there as well.
| Air valves are used to solve different problems in a pipeline, which are caused by air. These problems can be solved by one of the three basic functions of an air valve, as described below:
Vacuum breaking: – The pipeline structure is generally under load of the soil around. Normal pipeline pressure supports the line internally. But when vacuum occurs, the negative pressure brings extra load on pipe structure and when combined with other external loads, vacuum can be a reason for pipe rupture. |
– Vacuum cause contamination of the pipeline
by sucking ground water and soil into the pipeline, if the sealing is not proper. A good sealing at flange joints working well under positive internal pressure might fail under such negative pressure and cause such suction. Among this contamination, the joint can leak when the line is pressurized again. This is one reason we do no want vacuum in a pipeline. |
