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| HYDRAULIC FEATURES | The "ROMA"
model automatic air vent is an automatic valve with single float, used
for the evacuation and discharge of large volumes of air from water
supply pipes. The integrated tap device is equipped with a dual position
90° male seal. Position "A" communicates the system with the upper air
discharge recess while position "B" bypasses the system discharge recess
and permits its draining through the front slot. This renders it
particularly ideal for installation in zones outside buildings where
there is a high risk of freezing. The "ROMA" air vent valve may only be
installed vertically. In order to maximize the efficiency of the
discharge, it should be installed at the highest points in the system
or, if this is not possible, a TEE fitting should be installed at the
input, as in figure "C". When installing it at the top of an ascension
pipe, a conveyable discharge hose can be installed (option available
only on request). The particular spherical profile of the internal
floater-obturator in special thermoplastic rubber forestalls water
spatter during the sealing phase, in closure. The absence of sliding
guides, hence drag, allows the spherical floater an elevated velocity
and precision in closing besides avoiding dangerous incrustations. At
the discharge outlet there is a protective catch for dust and lint,
which, over time, could deposit upon the opening of the cap, obstructing
it; moreover, being perforated, anti-tampering seals may be used in
compliance with legislation currently in force.
The lower
anti-spray guard allows the hydraulic thrust to be distributed evenly
across the entire surface of the sphere, limiting
| | TECHNICAL FEATURES | | Pressure : |
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| | Maximum allowable working pressure (PN) |
| 16 bar | | minimum accumulation |
| 0.5 bar (Grade A according to EN 12266-1) | | Range of operation air evacuation |
| from 0.5 bar to 16 bar (tolerance ± 10% max. detected) | | Temperature : |
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| | maximum working temperature (TS) |
| 0° C(excluding ice) +110°C | | minimum plant storage |
| -20° C (with recess fluid discharged) | | Threading: |
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| | Pipeline connection |
| Threads according to ISO 228/1 | | Requirements and tests as per: |
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| | Air vents |
| EN 1074-4 | | Seat tightness |
| EN 1074-4 §5.2.2 | | Stop device |
| EN 1074-2 | | Pressure tightness |
| EN 1982 B.7 | | Pressure resistance |
| EN 1074-4 §5.1.1 | | DESIGN | | Cast brass body and male |
| EN 1982 - CB753SEN 1074-4 | | Cap in brass |
| EN 12165 - CW617N | | O-ring |
| NBR RUBBER | | Spherical floater |
| THERMOPLASTIC ELASTOMER | | Sphere guard |
| ACETAL RESIN (POM) | | | PRODUCT SIZE | | 20 - M - 3/4" | | 25 - M - 1" | | 33 - M - 1" 1/4 |
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