Cryogenic Globe Valve Flow Direction
Cryogenic Globe Valve Flow Direction
(OP)
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?





RE: Cryogenic Globe Valve Flow 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.
RE: Cryogenic Globe Valve Flow Direction
RE: Cryogenic Globe Valve Flow Direction
RE: Cryogenic Globe Valve Flow Direction
I2I
RE: Cryogenic Globe Valve Flow Direction
RE: Cryogenic Globe Valve Flow Direction
RE: Cryogenic Globe Valve Flow Direction
I2I
RE: Cryogenic Globe Valve Flow Direction
RE: Cryogenic Globe Valve Flow Direction
I2I
RE: Cryogenic Globe Valve Flow Direction
Is this valve in an isolation or control/throttling application? For isolation, I agree with JimCasey, flow under the seat will isolate the packing from system pressure, however this is only true for an unbalanced plug (which you would likely be using if it was an isolation application)
Is it a balanced or unbalanced plug?
What type of actuator is installed on this valve (pneumatic spring-diaphragm, pneumatic piston, electric, manual gear operator, top mounted handwheel)? For a top-mounted handwheel or gear operator, the bathtub stopper effect is not an issue.
tsenthill/I2I: With respect to the flashing/cavitation discussion, quote "With anti-cavitation trims, the vapor bubbles are maintained in the inner cavity so their collapse is located away from the trim solid parts susceptible to cavitation damage"
Is the purpose of anti-cavitation trim not to limit the pressure drop through the cage to small stages such that vapour bubbles never form at all, and thus, never collapse?
RE: Cryogenic Globe Valve Flow Direction
I2I
RE: Cryogenic Globe Valve Flow Direction
Also i was told that Multistage trims used in flashing service to reduce trim exit velocity.
RE: Cryogenic Globe Valve Flow Direction
I2I
RE: Cryogenic Globe Valve Flow Direction
RE: Cryogenic Globe Valve Flow Direction
I2I