Heavy Duty Balanced Opposed Compressors - Ariel Corporation

FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE
Type "UP" Pressure Breaker
This is a single solid ring. This ring breaks down or slows the gas flow without sealing it completely.
See Figure 5-32.
Type “P1U” Pressure Breaker
This set is made up of two rings. It allows controlled leakage in one direction only, and is
installed in the first or second packing cup (closest to the piston). The first ring (pressure
side) is one-piece with a single radial cut. The second ring is uncut (solid). The bore in the
second ring is larger than the rod diameter. See Figure 5-33.
Total End Gap - Installed:
0.058 to 0.064” (1.5 / to 1.7 mm) for
PEEK
0.029 to 0.035” (0.7 to 0.9 mm) for
Bronze & Cast Iron
End gap should be maintained by
replacing the ring.
FIGURE 5-32 TYPE “UP” PRESSURE BREAKER
FIGURE 5-33 TYPE “P1U” PRESSURE BREAKER
Type "BTR" Single Acting Seal Set
Pressure
Side
Pressure
Side
This set is made up of three rings. It seals in one direction only. The first ring (pressure side)
is radially cut. The second ring is a tangentially step cut ring and is made of the same material
as the first ring. The first two rings are doweled so the end gaps are staggered. The total
end gap installed is 17/32 to 9/16 in. (13 to 14 mm) for PEEK, Bronze & Cast Iron, and 9/32
to
5/16 in. (7 to 8 mm) for Teflon. The end gap should be maintained by replacing the ring. The
third ring is called a back-up ring and is radially cut. The bore in the backup ring is larger
than the rod diameter which allows its radial joints to fit tight together. No dowel is necessary
for this ring. See Figure 5-34.
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