Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE “Water”-cooled cases are lapped, and special care must be taken to prevent scratching the mating surfaces of the cups, which can cause significant problems. Cup surfaces must be clean and dry when being re-assembled. The cups are numbered on the outside diameter and are to be assembled in consecutive order, starting with the end cup. Reference the pressure packing assembly in your parts book and Figure 5-46 The studs are offset so the cups will only fit one way. Make sure the tie studs are completely screwed into the end cup. Put the proper ring in the groove and facing the proper direction. Be careful when sliding parts onto the tie studs to be sure that no scratching occurs to the lapped faces. Unless non-lube, rings are to be lightly coated with new clean lubricant before reassembly. Only use the same lubricant that is used in the force feed lube system. Install second cup next, put the rings in place, and make sure the two (2) small o-rings are in place around the coolant holes. Continue assembling the remaining parts in the proper configuration to the packing case drawing, in consecutive order, by repeating the above step. Install and tighten new tie rod stud-nuts. Using your fingers, make sure that all rings move freely, radially, in their grooves. Side loaded WAT and AL rings will be snug, but should still move using your fingers. Water-Cooled Piston Rod Packing - Testing 100% verification of function is required for all internal passages. The passages are to be checked by blowing dry compressed air through the connection taps on the flange and verifying that air is exiting at the proper holes. Pressure test packing cases as follows: Coolant Turnaround Cup Circumferential Identification Groove (Beginning 2006) O-Ring Groove FIGURE 5-46 “WATER”-COOLED PACKING CASE TURNAROUND CUP 1. Apply 60 to 100 psi (4 to 7 bar) dry, compressed air pressure to the “Coolant In” connection. For water cooled rod packing cases in non-lube service, compressed air is to be oil free. Air should exit at connection tap “Coolant Out”. Air 7/09 PAGE 5 - 55
FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE Valves applied to the tap stamped “Lube” should exit at the appropriate cup on the inside diameter of the case. 2 Plug the “Coolant Out” connection and apply 60 to 100 psi (4 to 7 bar) dry, compressed air pressure to the “Coolant In” connection through a ball valve with a calibrated pressure gauge located between the ball valve and packing case. Close the ball valve and disconnect the air supply. There should be no pressure drop for five minutes minimum. Cases which fail this testing procedure are to be disassembled, inspected, repaired, re-assembled and re-tested. Packing cases may be bolted into place in a cylinder head to aid sealing, using the proper bolting, and tightening torques. Most valves in JGZ and JGU cylinders use non-metallic plates. Valves - Removal ! 1. Loosen all of the cap screws slightly, on each valve cap. With all the cap screws 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 5-48 on Page 5-59. 2. After all of the above safety checks and with cap screws still in place but loosened, move the valve-cap out until the O-ring clears the cylinder to be sure that the cylinder is properly vented. A pair of appropriate pry bars, one on each side of the cap, will help pry it out. 3. Remove cap screws and valve cap. 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 1-2 ON PAGE 1-6 FOR LOCATION OF IMPORTANT SAFETY INFORMATION PLATES. CAUTION: BE CAREFUL TO PREVENT THE VALVE CAP, RETAINER AND/OR VALVE FROM FALLING OUT OF THE BOTTOM VALVE POCKETS TO PREVENT THE POTENTIAL OF PERSONAL INJURY. 4. With the retainer still in place, screw a valve tool over the valve center bolt, see Figure 7-1 on Page 7-2. 5. It may be necessary to loosen the plastic thumb screw retainer-keeper in the valve retainers. PAGE 5 - 56 7/09
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Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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