PRODUCT DATA SHEET This vent valve is for external mounting on road and rail fuel oil tankers, or static storage tanks. It protects the tank against collapse or rupture by enabling the tank to ‘breathe’ to atmosphere due to the volume variations caused by temperature change. Under normal conditions the pressure relief will open at 70 mb (1 psig) and the vacuum relief at 3 mb. Additional venting is incorporated for emergency response to higher internal tank pressures, such as may be encountered in the event of a fire. Three opening pressures are available for this condition; 140, 210 or 420 mb (2, 3 or 6 psig). An upset device is also included to prevent excessive liquid loss if the tanker overturns. This feature is overridden, however, should the emergency venting device come into operation. F0046| PRESSURE & VACUUM VENT VALVE F0046 FEATURES & BENEFITS Gunmetal body for high durability and corrosion resistance. 1“ BSPTr male threaded connection. Three pressure settings available: 2, 3 and 6 psig. Upset device to prevent liquid loss in rollover situation. Pressure relief at 70 mb (1 psig). Vacuum relief at 3 mb (0.042 psig). Weight: 0.9 kg. * * * * * * * WHEN SPECIFYING P/V VENTS FOR YOUR VEHICLE, THE FOLLOWING POINTS SHOULD BE CONSIDERED: What size of P/V Vent is required? Is this vent valve suitable for the application? * *
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