Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1987-10-13
1989-01-03
Griffin, Donald A.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
F16J 1526
Patent
active
047951710
ABSTRACT:
A pressurized fluid housing (4) has an opening (6) for receiving a movable shaft or stem (2). A hold down plate or bonnet (8) covers the opening and has an aperture (14) through which the shaft enters the housing. The hold down plate further includes a rigid, annular shoulder (34), facing downward, adjacent the shaft. A pressure plate or gland (18) is located within the opening and below the hold down plate. The pressure plate has an aperture (24) through which the shaft passes, and an upward-facing annular shoulder portion (40) adjacent the shaft and opposed to the shoulder on the hold down plate. An annular space (54) between the hold down plate and the pressure plate is maintained at ambient pressure through channels (16). The system pressure is imposed agains the lower surface (22) of the pressure plate to compress a packing ring (28) between the shoulders of the pressure plate and the hold down plate, thereby producing a radial pressure to seal the ring against the shaft. A variety of embodiments are shown, including arrangements for closing a vessel opening where no penetrating shaft or stem is present.
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