Can the flow direction on this type of globe valve be in either direction? The service is liquid oxygen with this valve located on the upstream side of the liquid oxygen vaporizers. There is a flow arrow on the side of the valve, but why would it matter if the flow is pushing up on the disc or down on the disc?It is probably due to the design of the valve, which prescribe no leakage in a particular direction.The pressure of the fluid may be used to push down the disc against the seat, to have a zero leakage capability in that direction, which would not be true if the fluid tends to take the disc from the seat.Discuss the specific globe valve model for review with the manufacturer. If this is a traditional globe valve, the velocity between the plug and seat can cause a bath-tub stopper affect that slams the plug into the seat due to reduced pressure when operating less than 10% travel. This may not be an issue if the valve is balanced like a cage valve. Many globe style valves have a recommended orientation and work satisfactorily in both directions.Or if it's just a garden-variety manual globe valve, the flow is from under the seat so that there is minimal pressure against the packing when the valve is closed.

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