Roma Air Vent
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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 position90° male seal. Position "A" communicates the system with the upper air discharge recess while position "B" bypasses the system discharge recessand 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, obstructingit; 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 : 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 : maximum working temperature (TS) 0° C(excluding ice) +110°C minimum plant storage -20° C (with recess fluid discharged) Threading: Pipeline connection Threads according to ISO 228/1 Requirements and tests as per: 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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