Heavy Duty Balanced Opposed Compressors
Heavy Duty Balanced Opposed Compressors
Heavy Duty Balanced Opposed Compressors
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FOR MODELS: JG AND JGA SECTION 5 - MAINTENANCE<br />
upon the operating speed (RPM), gas specific gravity and the suction temperature of the<br />
gas.<br />
Contact Ariel in Mount Vernon, for assistance in valve selection.<br />
Valves - Reassembly<br />
1. The 1/32 inches (0.8 mm) thick soft metallic flat gasket should be coated with an<br />
anti-seize lubricant. It can then be either inserted into the valve pocket or stuck<br />
onto the valve. In either case, care must be taken to keep this gasket from falling<br />
into the gas passage.<br />
2. The retainer keeper is a plastic thumb screw in a threaded hole in the bottom<br />
valve retainers. This should be screwed through just far enough to provide friction<br />
so that bottom retainers will not fall out while the cap is being installed.<br />
3. Using the Valve Tool illustrated in Figure 7-1: on page 7-3, the valve and the<br />
retainer may be inserted into the pocket together. When installed correctly, the<br />
distance from the outer retainer face to the surface of the valve boss on the cylinder<br />
will be 1/8 inches (3 mm) shorter than the length of the nose on the valve<br />
cap.<br />
4. Inspect the valve cap O-ring for cuts or gashes and replace it if necessary.<br />
Lubricate the O-ring and the nose of the valve cap. Some high pressure cylinders<br />
use a soft metallic wire gasket in lieu of the O-ring design. Insert the cap<br />
and tighten the bolts evenly to the recommended torque in Table 1-15 on page<br />
1-15. See “Bolt Tightening for Valve Caps” on page 5-33. If the assembly is correct,<br />
the distance from the underside of the cap to the valve boss surface on the<br />
cylinder will be 1/8 inches (3 mm).<br />
NOTE: BE CERTAIN ALL PARTS, GASKET FACES, AND MATING SURFACES ARE<br />
ABSOLUTELY CLEAN AND ALWAYS USE CLEAN, FRESH OIL ON THE<br />
THREADS BEFORE REINSTALLING BOLTS.<br />
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