FOR MODELS: JGW, JGR AND JGJ SECTION 5 - MAINTENANCE
1/01 PAGE 5 - 31
Type “AL” Double Acting Seal Set
This set is made up of five rings. The center three are radial cut and the two outboard rings
are step-tangent cut. The last two rings on each end are doweled together to stagger the
cuts. The installed total end gap is 0.078 to 0.109 inches (1.98 to 2.77 mm). The center ring,
along with the two adjacent rings, form a wedge that overcomes rod friction and forces the
set to have constant contact against both groove faces during either direction of rod travel.
This ring set is designed for gas purge applications. See Figure 5-18:.
Typical Arrangement of Piston Rod Packing Rings
Ariel supplies JGW, JGR and JGJ packings in two pressure ranges. The general arrange-
ment of the oil supply, seal ring and vent locations is shown below:
The oil wiper rings and a seal ring set are carried on a separate diaphragm in the crosshead
guide when a “two compartment distance piece” is supplied.
NOTE: REFER TO THE PACKING ASSEMBLY IN YOUR PARTS BOOK. SEE page 4-27
FOR PACKING TUBING AND DISTANCE PIECE VENTING AND page 4-28 FOR
PACKING LUBRICATION AND VENTING.
FIGURE 5-18: TYPE “AL” DOUBLE ACTING
Pressure Side
Pressure Breaker Ring
1-Single Seal Ring Set
Oil Supply
3-Single Seal Ring Sets
Primary Vent
Double Seal Ring Set
Wiper Set
Crankcase Side
Material: Teflon
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