SURGE SUPPRESSING CHECK VALVE

摘要

A check valve operable (20) between an open condition providing for fluid passage (25) and a closed condition closing the fluid passage and dividing it into inlet (26) and outlet (27) portions, has a variable-volume chamber (40-65) in communication with the outlet portion of the fluid passage and responsive to a predetermined pressure therein for increasing the volume of said chamber, thereby to increase the effective volume of the outlet portion of the fluid passage for suppressing pressure surges therein.