Pressure/Vacuum valves and cargo tank venting systems
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A PV valve is not one relief valve but two built into a single body: a pressure pallet that lifts when tank pressure rises above a set point, typically in the range of 1400–2100 mmWG on a tanker's inert gas system, and a vacuum pallet that lifts when pressure falls below a set point on the other side, commonly around 350 mmWG negative. Both pallets must reseat to a gas-tight closure once the pressure returns within the design band, because the valve is guarding a cargo tank that is meant…
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