The bypass lines are very short no more than a few feet.  I usually select a block valve and inlet line the same size as the PSV inlet flange and the outlet line the same size as the PSV outlet flange.  The bypass doubles as a vent.  The operating procedure for this arrangement needs to be developed with a view to the points raised above.
The bypass lines are very short no more than a few feet.  I usually select a block valve and inlet line the same size as the PSV inlet flange and the outlet line the same size as the PSV outlet flange.  The bypass doubles as a vent.  The operating procedure for this arrangement needs to be developed with a view to the points raised above.

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