A STUFFING BOX HAVING A SELF ENERGIZED PRESSURE RESPONSIVE SEALING MEANS

摘要

To seal off a high pressure area (62) from a low pressure area (64) by providing an increasing seal between a stem (44) and a stuffing box body (48) as the pressure differential between the high and low pressure areas (62,64) increases, a packing (42) that utilizes system pressure to load the packing and achieve sealing is located between the stem (44) and the stuffing box body (48) and consists of resilient end rings (52,54) and a stack of wedge-shaped annular non-resilient members (56) which are able to slide radially against each other to exert higher radial pressure as axial pressure increases. The high pressure fluid area (62) is in contact with one end ring (54), and a gland follower (94) is in contact with the other end ring(52).