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The 'ROMA' Fig. 669 Pressure/Vacuum Breather Valve is a dead weight loaded disc relief valve.
The valve body is designed to accommodate a weight loaded pressure relief disc to lift at a pre-determined pressure to discharge to atmosphere, and a dead weight loaded vacuum relief disc to lift at a pre-determined vacuum and admit air to a vessel.
The pressure and vacuum disc assemblies are weighted to relieve at the specified pressure and vacuum. When the lift-off pressure or vacuum is reached the valve will open with only a small accumulation in pressure or vacuum.
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