Heavy Duty Balanced Opposed Compressors - Ariel Corporation

FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE
When “WAT” rings are used in tail rod applications, the pressure side is the outboard side,
due to the air compressing-blowing action with the tail rod catcher. In this case, the match
mark letters for “WAT” rings only are to be positioned away from the cylinder.
Outer Wedge
Ring - Radial
Cut
Outer Wedge Ring (Pressure Side)
Center Wedge
Ring - Radial
Cut
Center Wedge Ring
Butt Tangent
Ring
FIGURE 5-36 TYPE “WAT” DOUBLE ACTING SEAL SET
Type “AL” Double Acting Seal Set
This set is made up of five rings which function like a double ended “WAT” design ring set.
The total end gap installed is 9/32 to 5/16 in. (7 to 8 mm) for Teflon. The end gap should be
maintained by replacing the ring. It is meant to be used in a groove into which low-pressure
fluid is supplied which serves to totally block leakage. “AL” rings must be centered when
installed in the packing case. See Figure 5-37.
FIGURE 5-37 TYPE “AL” DOUBLE ACTING SEAL SET
Type “BTU” Single Acting Seal Set
Butt Tangent Ring
Alignment
Dowel
Material: Teflon;
Letters toward pressure/cylinder
Material:
Teflon
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. 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
uncut (solid). The bore in the back-up ring is larger than the rod diameter. See Figure 5-38.
7/09 PAGE 5 - 49