Abstract: A pulsation dampener device particularly adapted for the efficient dampening of pulsations over a wide frequency range. The device is characterized by the ability to operate over a high temperature range and be operable when contacted by corrosive and like aggressive fluids within which pulses are generated. The device includes a pressure vessel which is cylindrical in section, a piston member shiftable axially within the vessel and dividing the same into a gas chamber and a fluid chamber, the piston incorporating a deflectible diaphragm disposed within a permeable cage whereby dampening may be effected by either or both of a bodily movement of the piston within the vessel or by deflecting movements of the diaphragms within the cage.

Abstract: A captive sealing assembly including a sealing mass of deformable material and first and second retainers on opposite sides of the sealing mass. The sealing assembly is adapted for use in a seal groove at least partially defined by first and second surfaces to be sealed. The first and second surfaces and the retainers cooperate to define a completely enclosed seal cavity of variable volume for the sealing mass. The retainers are resiliently loaded in a direction to compressively load the sealing mass.