Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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Section 4 Part Replacement For Models: JGH:E:K:T Variable Volume Clearance Pocket (VVCP) A VVCP changes the clearance volume of the head end of a cylinder. The amount of clearance depends on the position of the clearance pocket piston. Users turn the piston/stem assembly counterclockwise to increase clearance, and clockwise to decrease it. Sometimes gas begins to leak from the VVCP, usually detected by a device connected to the VVCP packing vent. This leakage indicates a need to replace the V-packing or seal within the VVCP. VVCP Removal CAUTION: Completely vent the cylinder before VVCP removal. Attempting to remove the VVCP without venting results in possible equipment damage, personal injury, or death. 1. After venting the cylinder, loosen the locking handle so the adjustment handle can turn freely. Try to turn the adjustment handle. CAUTION: A hard to turn adjustment handle indicates pressurized gas trapped within the VVCP. See VVCP Disassembly caution below. 2. Tighten the locking handle. 3. Disconnect the packing vent. 7 4. Remove plastic plug from eyebolt hole and thread an eyebolt into the eyebolt hole. FIGURE 4-2 Typical VVCP 5. Slide a crane hook through the eyebolt and remove slack from the crane chain. 6. Remove all flange bolts and slide the VVCP out from the cylinder. The <strong>Ariel</strong> Performance Program contains approximate VVCP weights. 7. Discard the head gasket and transport the VVCP to a suitable work area for disassembly VVCP Disassembly 1 2 3 4 5 The VVCP piston ring is not gas-tight to allow a nearly balanced gas pressure, which eases VVCP adjustment with the cylinder pressurized. Gas pressure behind the VVCP piston normally vents when the cylinder vents. However, process debris or rust around the piston ring can form a seal that traps gas within the VVCP assembly, sometimes at substantial pressure. CAUTION: Trapped gas pressure can present a personal safety hazard when servicing the VVCP. Work in a well-ventilated, non-sparking area, particularly with sour gas applications. Do not breathe gas emission from VVCP when venting trapped gas. PAGE 4-2 3/11 6 1. Cylinder 2. Eyebolt 3. Packing Vent 4. Locking Handle 5. Adjustment Handle 6. Flange bolts 7. Bellows Thread Protector
For Models: JGH:E:K:T Section 4 Part Replacement 1. Place the VVCP on a table, adapter up. 2. The bellows thread protector grips a lip on the adjustment handle. Use pliers to pull the bellows from the adjustment handle lip. Do not tear the bellows. 3. Remove locknut. 4. Remove adjustment handle. The adjustment handle is a tapered fit onto the piston stem; use a slugging hammer or puller to break the fit. 5. Thread the locking handle off of the piston stem. Leave the bellows thread protector attached to the locking handle. 6. Depending on size, a VVCP may have two to four socket head bolts. Use a marker to draw match marks on the side of the VVCP where the adapter and 1 2 3 4 5 6 7 8 9 8 10 11 1. Locknut 2. Adjustment Handle 3. Adjustment Handle Lip 4. Bellows Thread Protector 5. Locking Handle 6. Grease Fitting NOTES: • Some adapters use a bolted retaining plate (15) and others use a snap ring (16) and spring retainer (17). • The O-ring (14) fits into a groove machined into either the head (11) face or adapter (7) base. FIGURE 4-3 VVCP Disassembly/Assembly head join at each socket head bolt location. Loosen the socket head bolts evenly and incrementally to release any potentially high-pressure gas. Do not breathe gas emission from VVCP. 7. Remove socket head bolts and turn the adapter counterclockwise to thread it off of the piston stem. Place adapter base up next to the head. 8. Remove the piston stem and piston assembly from the head. The piston stem and piston are permanently joined; do not attempt to disassemble them. 9. Remove the piston ring from the piston. 10. Depending on VVCP size, <strong>Ariel</strong> machines a groove for the O-ring into either the face of the head or the base of the adapter. Remove and discard the O-ring. 11. Some adapters use a bolted retaining plate while others use a snap ring and spring retainer: a. Retaining Plate - Remove retaining plate bolts and retaining plate. 3/11 PAGE 4-3 9 12 13 14 7. Adapter 8. Match Mark 9. Piston Stem 10. Socket Head Bolt 11. Head 12. Piston 13. Piston Ring See Notes 15 16 17 18 19 20 14. O-ring 15. Retaining Plate 16. Snap Ring 17. Spring Retainer 18. Compression Spring 19. Backup Ring 20. V-packing or Seal
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Maintenance and Repair Manual For J
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For Models: JGE:H:K:T Oil Strainer.
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For Models: JGE:H:K:T SECTION 5 - S
Page 8 and 9: For Models: JGH:E:K:T FIGURE 4-23
Page 10 and 11: For Models: JGH:E:K:T General Safet
Page 12 and 13: For Models: JGH:E:K:T Ariel Contact
Page 14 and 15: Section 1 - Tools For Models: JGH:E
Page 16 and 17: Section 1 - Tools For Models: JGH:E
Page 18 and 19: Section 2 - Instrumentation For Mod
Page 32 and 33: Section 3 - Maintenance For Models:
Page 60 and 61: Section 4 Part Replacement For Mode
Page 102 and 103: Section 5 - Start Up For Models: JG
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Section 5 - Start Up For Models: JG
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Section 5 - Start Up For Models: JG
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Section 6 - Troubleshooting For Mod
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Section 6 - Troubleshooting For Mod
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Appendix A Ariel Fasteners and Torq
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Appendix B - Clearances For Models:
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Appendix C - Frame Specifications F
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Appendix C - Frame Specifications F
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Appendix D Compressor Clearance, Oi
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Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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