Infloor Air Separators 31080-31088 - Manual (Page 3)

Operating principle
The air separator uses the combined action of several physical
principles. The active part consists of an assembly of concentric
metal mesh surfaces. These elements create the whirling
movement required to facilitate the release of micro-bubbles and
their adhesion to these surfaces.
The bubbles, fusing with each other, increase in volume until the
hydrostatic thrust is such as to overcome the adhesion force to the
structure. They rise towards the top of the unit from which they are
released through a float-operated automatic air release valve.
Construction details
DISCAL devices are constructed in such a way as to allow
maintenance and cleaning operations to be carried out without
having to remove the valve body from the pipework. All valves are
fitted with a bottom connection for fitting a drain valve. All internal
air release control components are fully accessible in all the
models.
The automatic air release valve, located at the top of the units, has
a long chamber for the movement of the float. This feature prevents
any debris present in the water from reaching the sealing seat. In
threaded models, the valve may be removed in order to have full
access to the steel separating element.
Flanged models are fitted with a further cock to drain large amounts
of air when filling the circuit and to remove any debris present
above the water level.
Insulation
DISCAL flanged units are available complete with heat-preformed
shell insulation. This system ensures not only perfect heat insulation
but also the tightness required to prevent atmospheric water
vapour from entering the unit. For this reason, this type of insulation
may also be used in cooling water circuits, as it prevents
condensation from forming on the surface of the valve body.