We don't have synonyms for valsalva yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are valhalla and villalva.
(n) :
Ellipsis of Valsalva device. [A device used in spacesuits and diving helmets to allow the wearer to equalize the pressure in their ears by performing the Valsalva maneuver inside the suit without using their hands to block their nose.]
(n) :
Ellipsis of Valsalva device. [A device used in spacesuits and diving helmets to allow the wearer to equalize the pressure in their ears by performing the Valsalva maneuver inside the suit without using their hands to block their nose.]