ARI Armaturen Air vent PN 40 EN - Manual (Page 3)

Rev. 0040807004 2714 Page 2-3
Operating and installation instructions
Automatic air vent
4.0 Description
4.1 Scope of application
Automatic air vents with level regulation are used for the de-aeration and venting of pipeline
systems.
The information complies to the Pressure Equipment Directive 97/23/EC.
It is the responsibility of the machine planner to ensure compliance.
The special markings on the valve must be taken into account.
Refer to the catalogue sheet to see which materials are used in standard versions.
Please contact the supplier or the manufacturer if you have any questions.
4.2 Operating principles
(refer to Fig. 3 page 8)
Deaeration and venting is controlled by a swivel-mounted ball float (Pos. 24.16).
As the automatic air vent is installed at the highest point of the pipeline system or vessel,
any air in the pipeline system or vessel is led to the automatic air vent.
As long as no liquid flows into the automatic air vent, the float controller (Pos. 24) stays
open, and air is discharged.
If liquid enters the automatic air vent, the ball float (Pos. 24.16) rises with the liquid level
and the valve plug (Pos. 24.4) seals the outlet of the controller (Pos. 24). The pipeline
system or vessel is closed to the outside. No liquid can escape from the system via the
automatic air vent.
If the liquid in the pipeline system or vessel falls, the ball float (Pos. 24.1) drops down and
the controller orifice is opened.
For increased venting power use a version with built-on venting valve.
ATTENTION !
- Refer to the data sheet for applications, limits on use and possibilities.
- Certain media require or preclude the use of special materials.
- The valves are designed for standard operating conditions. If conditions exceed
these requirements, e.g. aggressive or abrasive media, the operator should
state the higher requirements when ordering.
- Valves made from grey cast iron are not authorised for use in systems subject
to TRD 110.