Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE VVCP - Head-End Variable Volume Clearance Pocket VVCP Piston VVCP - Removal ! CAUTION TRAPPED GAS PRESSURE CAN PRESENT A PERSONAL SAFETY HAZARD WHEN SERVICING THE VVCP. WORK IN A WELL VENTILATED, NON SPARKING AREA. DO NOT BREATHE GAS EMITTED FROM VVCP WHEN VENTING TRAPPED GAS. Compressor Cylinder Trapped Gas Pressure VVCP Piston Ring (not gas tight seal) VVCP Assembly Compression Spring Vent to Safe Atmosphere Snap Ring O-Ring Locking Handle or Locknut Backup Ring Grease Fitting VVCP Packing V-Packing Thread Protector Bellows or Dust Cover Over End of Stem See the Ariel Parts Book for the VVCP Assembly Drawing and Parts List that applies. VVCP Stem and Piston Assembly Adjusting Handle or on smaller VVCP’s, Wrench Flats on Stem for Adjusting FIGURE 5-50 COMPRESSOR CYLINDER WITH VVCP - TYPICAL Nylon Insert Locknut to Secure Adjusting Handle be sure that all pressure is relieved from the compressor cylinders prior to removing vvcp. Disconnect VVCP packing vent. Remove the VVCP from the cylinder using similar procedures as when removing a cylinder head. The approximate weights of VVCP’s for handling purposes can be found in the current Ariel Performance Program. 7/09 PAGE 5 - 61
FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE VVCP - Disassembly For larger VVCP’s, unsnap thread protector bellows from the slot in adjusting handle. With the locking handle locked, remove nylon-insert locknut and adjusting handle. Smaller VVCP’s are not equipped with an adjusting handle, but have wrench flats on the stem for adjustment. Some smaller VVCP’s have a dust cover. The smallest VVCP’s have a locking nut in lieu of a locking handle. A hammer or puller may be required to break adjusting handle to stem tapered fit. Loosen the locking handle (or locknut) and unscrew to remove. Remove head bolting to remove VVCP from cylinder. Remove socket head screws at inside of bolt flange and separate the halves of the VVCP. Unscrew the VVCP stem and piston assembly to remove. VVCP - Maintenance To replace or clean the VVCP packing, mechanically depress the packing assembly spring and remove the snap ring. A piece of threaded rod, two hex nuts and two heavy washers may be used to compress the packing assembly. The inner washer must be large enough to catch the packing assembly, and small enough to allow the snap ring to be compressed and removed. Use proper snap ring pliers. Replace the VVCP packing when excessive leakage is noted at the vent. Remove the VVCP piston ring; replace as necessary. Clean all parts to remove all debris, rust, etc. The stem and piston are permanently attached to each other, do not attempt to disassemble. When replacing the VVCP packing, place new packing between two flat surfaces, such as two pieces of wood and tap wood with hammer to relax the packing elements prior to assembly. Reassemble the VVCP in reverse order, lubricate and install a new O-ring at the bolt flange between the two-halves. Refer to Section 1 for bolting tightening torque value. Lubricate stem with three to four pumps of all-purpose petroleum grease with a hand pump grease gun at the grease fitting. To re-install the VVCP on the cylinder, use a new head gasket. Lubricate threads and bolting seating surfaces with petroleum type lubricant and install bolting. Tighten each cap screw until snug using a criss-cross pattern. Next tighten each cap screw to 25 percent of full torque, moving from cap screw to cap screw in a criss-cross pattern. Repeat this step for 50, 75, and 100 percent of full torque. Refer to Section 1 for tightening torque value. Reconnect VVCP packing vent. Re-install and tighten locking handle (or locknut), install bellows, adjusting handle and Nylon-insert locknut, if applicable. Be sure that thread protector bellows are properly aligned when installing adjusting handle. Tighten Nylon-insert locknut. Refer to Section 1 for tightening torque value. When installing a new VVCP, check total piston end clearance, check crank end/head end feeler gage clearances with VVCP completely closed. Refer to Section 1 for clearances. VVCP - Adjustment VVCP clearance volume may be changed with the compressor running or stopped. Consult the Packager’s instructions regarding where to set the VVCP. Also refer to the VVCP data sheet in the Ariel Technical Manual Parts Book. The VVCP piston ring is designed not to be gas tight, to allow a nearly balanced gas pressure for ease of VVCP adjustment with the cylinder pressurized. Gas pressure behind the VVCP piston normally vents when cylinder is vented. Process debris or rust around the piston ring PAGE 5 - 62 7/09
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Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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