Heavy Duty Balanced Opposed Compressors

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FOR MODELS: JG AND JGA SECTION 5 - MAINTENANCE upon the operating speed (RPM), gas specific gravity and the suction temperature of the gas. Contact Ariel in Mount Vernon, for assistance in valve selection. Valves - Reassembly 1. The 1/32 inches (0.8 mm) thick soft metallic flat gasket should be coated with an anti-seize lubricant. It can then be either inserted into the valve pocket or stuck onto the valve. In either case, care must be taken to keep this gasket from falling into the gas passage. 2. The retainer keeper is a plastic thumb screw in a threaded hole in the bottom valve retainers. This should be screwed through just far enough to provide friction so that bottom retainers will not fall out while the cap is being installed. 3. Using the Valve Tool illustrated in Figure 7-1: on page 7-3, the valve and the retainer may be inserted into the pocket together. When installed correctly, the distance from the outer retainer face to the surface of the valve boss on the cylinder will be 1/8 inches (3 mm) shorter than the length of the nose on the valve cap. 4. Inspect the valve cap O-ring for cuts or gashes and replace it if necessary. Lubricate the O-ring and the nose of the valve cap. Some high pressure cylinders use a soft metallic wire gasket in lieu of the O-ring design. Insert the cap and tighten the bolts evenly to the recommended torque in Table 1-15 on page 1-15. See “Bolt Tightening for Valve Caps” on page 5-33. If the assembly is correct, the distance from the underside of the cap to the valve boss surface on the cylinder will be 1/8 inches (3 mm). NOTE: BE CERTAIN ALL PARTS, GASKET FACES, AND MATING SURFACES ARE ABSOLUTELY CLEAN AND ALWAYS USE CLEAN, FRESH OIL ON THE THREADS BEFORE REINSTALLING BOLTS. PAGE 5 - 32 11/01
FOR MODELS: JG AND JGA SECTION 5 - MAINTENANCE Valve Retainer Suction Valve Springs Guide Ring Seat Suction Valve Plate Guard Typical Suction Valve Valve Cap O-Ring Center Bolt or Stud Cylinder Bore FIGURE 5-18: TYPICAL VALVE ASSEMBLIES Bolt Tightening for Valve Caps Valve Cap 1/8” (3mm) Proper fastener tightening technique is essential for sealing of valve caps with soft metallic wire gaskets used in some high pressure cylinders. It is important to draw up bolting to full torque in even and gradual steps. Do not allow the valve cap to be tightened with bias on one bolt or to become cocked in the bore. Such bias or cocking can cause uneven crush of the gasket, which could cause a leak and could also cause bolt failure. This step tightening procedure is also recommended for all valve caps. Install the valve assembly (and high clearance spacer, when applicable), with the flat gaskets) and valve retainer, in the valve pocket. See “Valves - Reassembly” on page 5-32. For 11/01 PAGE 5 - 33 Lock Nut Guard Typical Discharge Valve Plastic Thumb Screw Discharge Valve Springs Discharge Valve Plate Seat “Steel” Valve Gasket
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Heavy Duty Balanced Opposed Compressors

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