FOR MODELS: JGW, JGR AND JGJ SECTION 5 - MAINTENANCE
PAGE 5 - 32 1/01
Piston Rod Packing Ring Material
In the past, bronze was the standard material for Ariel packing rings. Bronze, however, is
unsatisfactory for sour gas service, (hydrogen sulfide in the gas). PEEK, cast iron and Teflon
provide outstanding service with sour gas, and since they perform equally well with sweet
gas, they are now the standard materials.
A typical packing will have a PEEK pressure breaker, Teflon/cast iron single acting rings, all
Teflon double acting rings, and a cast iron wiper set. The Teflon is glass reinforced and
impregnated with molybdenum disulfide. This provides a strong, slick material to reduce fric-
tion and wear.
Valves
Valves - Removal
1. Slightly loosen all of the bolts on each valve cap. With all the bolts loose, the cap
should stay in its original position. If it pushes out on its own accord-stop! Take
steps to completely vent the cylinder. See Caution above. A typical valve
assembly is shown in Figure 5-19: on Page 5-34.
2. After all the above safety checks, remove the valve cap bolts. A pair of prybars
(or screwdrivers), one on each side of the cap, will help pry it loose. With the
retainer still in place, screw a valve tool over the valve center bolt. See Figure 7-
1: on page 7-3. Now the valve and retainer can be pulled out together. For cylin-
der class 2R-FS-HE and 2RJ-FS-HE tandem cylinders, the suction and dis-
charge piping and cylinder head must be removed to gain access to the
concentric valve. A concentric valve combines the suction and discharge valves
in one assembly. See Caution at “Piston and Rod - Removal” on page 5-18.
3. In most cases the flat metal gasket will remain in the pocket. It is difficult to see.
A flashlight and a small mirror on an adjustable rod are the best tools to see the
gasket clearly. On cylinders with horizontal valves, the gasket may fall into the
gas passage. A small magnet on a flexible extension rod will help fish it out. This
gasket should be replaced after several uses.
CAUTION
BEFORE ATTEMPTING TO REMOVE ANY VALVE CAP, BE
CERTAIN THAT ALL PRESSURE HAS BEEN VENTED FROM
THE COMPRESSOR CYLINDER. THE PRESSURE MUST BE
COMPLETELY VENTED FROM BOTH THE SUCTION AND
DISCHARGE PASSAGES OF THE CYLINDER. SEE FIGURE 1-
3: ON PAGE 1-4 FOR LOCATION OF IMPORTANT SAFETY
INFORMATION PLATES.
!
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