Heavy Duty Balanced Opposed Compressors

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FOR MODELS: JG AND JGA SECTION 5 - MAINTENANCE Typical Arrangement of Piston Rod Packing Rings The general arrangement of the oil supply, seal ring and vent locations is shown below: Pressure Side Pressure Breaker Ring 1-Single Seal Ring Set Oil Supply 3-Single Seal Ring Sets 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 4-21 FOR PACKING TUBING AND DISTANCE PIECE VENTING AND PAGE 4-22 FOR PACKING LUBRICATION AND VENTING. 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 friction and wear. PAGE 5 - 30 11/01 Primary Vent Double Seal Ring Set Wiper Set Crankcase Side
FOR MODELS: JG AND JGA SECTION 5 - MAINTENANCE 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 5-18: on Page 5-33. 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 cylinder class 1-3/4JG-FS-HE and 2-1/2JG-FS-HE tandem cylinders, the suction and discharge 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. Valves - Maintenance ! 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 1-3 FOR LOCATION OF IMPORTANT SAFETY INFORMATION PLATES. Ariel uses valves manufactured by Hoerbiger Corporation. Before servicing any valve refer to the correct valve assembly drawing and parts list and Hoerbiger's literature in the Parts Book. On the valve assembly drawing you will notice that valves have different springing for different pressure levels. The cylinder cover sheet in the Parts Book lists the valve originally supplied with each cylinder. If different operating pressures are encountered, then different springs may be required. The suction valve must be selected on the basis of operating suction pressure and the discharge valve for operating discharge pressure. Proper valve spring selection is also based 11/01 PAGE 5 - 31
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Heavy Duty Balanced Opposed Compressors

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