• KBU & KBZ Reciprocating Gas Compressors

    Ariel's large medium-speed reciprocating separable compressors are capable of handling high rod loads of 150,000 lbs667,233 N. The KBU and KBZ have proven to be the most cost effective method of compression for applications requiring large-horsepower drivers and high-compression capacity.

    Size Comparison
     

  • Product Features

  • Slider_Aux_End_ZUBV_300_260

    Full-Pressure Lubrication

    A frame-driven lube oil pump provides cooled oil through a full-flow oil filter to all moving parts in the frame. A divider-block system supplies metered oil to cylinder bores and rod packings.

    Slider_Bolting_Grade8_300_260

    High-Strength Bolting

    Durable Grade 8 bolting on all loaded joints, combined with specially designed fatigue-fighting bolts on all valve caps ensure ultimate holding strength.

    Slider_Conrod_ZUBV_300_260

    Rigid Connecting Rods

    The KBZ/KBU compressors feature durable connecting rods manufactured from forged steel with a 4-bolt heavy-duty "I" section.

       
      Slider_Crosshead_ZU_300_260

      Rugged Crossheads

      One-piece, long-life crossheads with hardened, ground steel crosshead pins feature direct, full-pressure lubrication at the top and bottom for minimum wear.

       

      Slider_cylinder_300_260

      Innovative Cylinders

      Ariel's horizontal and double-acting cylinders eliminate the cost of a cylinder cooling system and remove the maintenance problems associated with water cooling.

       
      Slider_piston_rod_300_260

      Durable Pistons and Rods

      KBZ/KBU compressors feature wear-resistant ductile or gray iron pistons and precision-ground alloy steel piston rods with locking crosshead nuts. Rolled threads are 1/4" under rod diameter for easy installation.

      Slider_Bearings_ZUBV_300_260

      Precision Bearing Shells

      Every Ariel compressor features precision-machined, compact, tri-metal main and connecting rod bearings.

       
      Slider_VVCP_300_260

      Versatile Unloading Devices

      Ariel offers manual, head-end variable volume clearance pockets on most cylinders. Pneumatic suction valve un-loaders are available on a limited basis.
       
      Slider_Valve_CDZUBV_300_260

      Efficient Valving

      Plate-type valves are designed for modern speeds, utilizing non-metallic sealing elements as standard. Valves are selected to comply with established low-valve velocity standards.

       

      Slider_crankshaft_300_260

      Heavy-Duty Crankshafts

      The JGJ compressors feature forged steel, precision-machined crankshafts with integral counter-weights manufactured by Ariel Corporation.

       
      Slider_filter_canister_ZUBV_300_260

      High-Efficiency Canister Type Oil Filters

      Ariel KBU/KBZ compressors feature high-efficiency canister filters rated at 1 micron nominal and 12 micron absolute.

       

      Slider_Frame_ALL_Frames_300_260

      Rugged Crankcase

      Ariel crankcases are designed for long service life and ease of access during maintenance. Our crankcases feature a heavily-ribbed, high-strength cast iron base with a removable lightweight aluminum top cover.

    • Full-Pressure Lubrication

      A frame-driven lube oil pump provides cooled oil through a full-flow oil filter to all moving parts in the frame. A divider-block system supplies metered oil to cylinder bores and rod packings.



       

      High-Strength Bolting

      Durable Grade 8 bolting on all loaded joints combined with specially designed fatigue-fighting bolts on all valve caps ensure ultimate strength.



      Rigid Connecting Rods

      This compressor features durable connecting rods manufactured from forged steel with a 4-bolt heavy-duty "I" section.



       

      Rugged Crossheads

      One-piece, long-life crossheads with hardened, ground steel crosshead pins and direct, full-pressure lubrication at the top and bottom for minimum wear.



       

      Innovative Cylinders

      Ariel's horizontal and double-acting cylinders eliminate the cost of a cylinder cooling system and remove the maintenance problems associated with water cooling.



      Durable Pistons and Rods

      This compressors features wear-resistant ductile or gray iron pistons and precision-ground alloy steel piston rods with locking crosshead nuts. Rolled threads are 1/4" under rod diameter for easy installation.



      Precision Bearing Shells

      Every Ariel compressor features precision-machined compact tri-metal main and connecting rod bearings.



       

      Versatile Unloading Devices

      Ariel offers manual, head-end variable volume clearance pockets on most cylinders. Pneumatic suction valve un-loaders are available on a limited basis.



      Efficient Valving

      Plate-type valves are designed for modern speeds, utilizing non-metallic sealing elements as standard. Valves are selected to comply with established low-valve velocity standards.



      Heavy-Duty Crankshafts

      Ariel manufactured crankshafts are precision-machined one-piece forged steel with integral counter-weights, balanced for smooth operation.



      High-Efficiency Spin-On Oil Filters

      This compressor features high-efficiency canister filters rated at 1 micron nominal and 12 micron absolute.



       

      Rugged Crankcase

      Ariel crankcases are designed for long service life and ease of access during maintenance and feature heavily-ribbed, high-strength cast iron base with removable lightweight aluminum top cover.




    • Specifications

    • Frame KBU KBZ
      KBU/2 KBU/4 KBU/6 KBZ/2 KBZ/4 KBZ/6
      Number of Throws 2 4 6 2 4 6
      Rated Power (BHP) 2,600 5,200 7,800 2,600 5,200 7,800
      Stroke (inch) 5.75 6.75
      Maximum RPM 1,200 1,000
      Piston Speed (FPM) 1,150 1,125
      Total Rod Load (lbs) 150,000
      Tension (lbs) 75,000
      Compression (lbs) 80,000
      Average Weight without Cylinders (lbs) 14,700 27,300 39,800 14,750 27,400 39,900
      Maximum Length (inch) 86 135 183 86 135 183
      Nominal Width (inch) 192
      Crankshaft Centerline, from bottom (inch) 24
      Frame KBU KBZ
      KBU/2 KBU/4 KBU/6 KBZ/2 KBZ/4 KBZ/6
      Number of Throws 2 4 6 2 4 6
      Rated Power (kW) 1,939 3,878 5,816 1,939 3,878 5,816
      Stroke (mm) 146 171
      Maximum RPM 1,200 1,000
      Piston Speed (m/s) 5.84 5.71
      Total Rod Load (N) 667,233
      Tension (N) 333,617
      Compression (N) 355,857
      Average Weight without Cylinders (kg) 6,668 12,383 18,052 6,690 12,428 18,098
      Maximum Length (mm) 2,184 3,429 4,648 2,184 3,429 4,648
      Nominal Width (mm) 4,877
      Crankshaft Centerline, from bottom (mm) 609.6
       
      KBZ
      KBU
      Number of Throws
      2 | 4 | 6
      2 | 4 | 6
      Stroke
      6.75 in
      5.75 in
      171 mm
      146 mm
      Rated RPM
      1,000
      1,200
      Rated Power/Throw
      1,300 BHP
      969 kW

      Internal Gas Rod Loads

      Compression
      80,000 lbf
      855.9 kN
      Tension
      75,000 lbf
      333.6 kN
      Total
      150,000 lbf
      667.2 kN

      Miscellaneous

      Rod Diameter
      2.875 in
      73 mm
      Crankshaft Centerline
      18.500 in
      470 mm
      Main Diameter
      8.000 in
      203 mm
      Guide Design
      Separable

      Material

      Crankshaft
      Forged Steel
      Connecting Rod
      Forged Steel
      Crosshead
      Ductile Iron
      Crosshead Bushing
      Steel

    • Materials

    • Crankcase
      Crankcase

      Crankcase

      Crosshead
      Crosshead

      Crosshead

      Connecting Rod
      Connecting Rod

      Connecting Rod

    • Part Material
      Crankcase Gray Iron
      Crosshead Ductile Iron
      Crankshaft Forged Steel
      Connecting Rod Forged Steel
      Main Bearing Tri-Metal
      Thrust Bearing Bronze
      Connecting Rod Bearing Tri-Metal
      Crosshead Guide Ductile Iron
      Crosshead Pin Alloy Steel
      Crosshead Pin Bushing Steel Backed Bronze
      Stress Bolts, Standard Grade 8

    • Cylinders

      Cylinders

      •  
      •  
       

      Innovative Cylinders

      The proven design of the Ariel cylinder eliminates the cost of a cylinder cooling system and removes the complexity and maintenance problems associated with water cooling, such as scaling and corrosion.

      • Horizontal single or double-acting, ion-nitrided, non-cooled compressor cylinders
      • Plugged indicator connections on the head end and crank end
      • SAE series 4100 steel piston rods, ion-nitrided with rolled threads
      • Pistons of wear-resistant gray iron or ductile iron
      • Non-metallic piston and rider rings
      • Full floating, vented rod and wiper packings
      • Non-metallic plates in suction and discharge valves
    • Drag sliders to narrow cylinder choices

      Bore
       
      Pressure
       
      Operation Class BORE (inch) MAWP (psig) Material
      Double-Acting 4-5/8Z:U-VS 4.250; 4.375; 4.625 6,000 Forged Alloy Steel
      Double-Acting 4-5/8Z:U-TR-VS 4.250; 4.625 6,700 Forged Alloy Steel
      Double-Acting 5-3/8Z:U-VS 5.000; 5.375 6,000 Forged Alloy Steel
      Double-Acting 5-3/8Z:U-TR-VS 5.000; 5.375 6,700 Forged Alloy Steel
      Double-Acting 6-1/4Z:U 5.875; 6.250 2,435 Ductile Iron
      Double-Acting 6-1/4Z:U-VS 5.875; 6.250 4,500 Forged Alloy Steel
      Double-Acting 7-1/4Z:U 6.750; 7.250 2,415 Ductile Iron
      Double-Acting 7-1/4Z:U-VS 6.750; 7.000; 7.250 3,500 Forged Alloy Steel
      Double-Acting 8-3/8Z:U 7.875; 8.375 2,400 Ductile Iron
      Double-Acting 9-5/8Z:U 9.125; 9.625 1,900 Ductile Iron
      Double-Acting 11Z:U 10.500; 11.000 1,270 Ductile Iron
      Double-Acting 12-1/2Z:U 12.000; 12.500 800 Ductile Iron
      Double-Acting 12-1/2Z:U 12.000; 12.500 1,700 Ductile Iron
      Double-Acting 14-1/8Z:U 13.625; 14.125 815 Ductile Iron
      Double-Acting 14-1/8Z:U 13.625; 14.125 1,270 Ductile Iron
      Double-Acting 15-7/8Z:U 15.375; 15.875 635 Ductile Iron
      Double-Acting 15-7/8Z:U 15.375; 15.875 845 Ductile Iron
      Double-Acting 17-7/8Z:U 17.375; 17.875 445 Ductile Iron
      Double-Acting 17-7/8Z:U 17.375; 17.875 635 Ductile Iron
      Double-Acting 20-1/8Z:U 19.625; 20.125 345 Ductile Iron
      Double-Acting 22Z:U 22.000 285 Ductile Iron
      Double-Acting 24-1/8Z:U 24.125 275 Ductile Iron
      Double-Acting 26-1/2Z:U 26.500 230 Ductile Iron
      Double-Acting 13ZN:UN 13.000 1,350 Ductile Iron
      Double-Acting 9-1/4ZK:UK 8.75; 9.25 2,400 Ductile Iron
      Double-Acting 9-3/4ZM:UM:ZL:UL 8.75; 9.25; 9.75 1,700 Ductile Iron
      Double-Acting 10-3/8ZM:UM:ZL:UL 9.875; 10.375 1,900 Ductile Iron
      Double-Acting 11ZM:UM:ZL:UL 10.250; 10.750; 11.000 1,690 Ductile Iron
      Double-Acting 11-3/8ZM:UM:ZL:UL 10.875; 11.375 1,700 Ductile Iron
      Double-Acting 12-3/8ZM:UM:ZL:UL 11.250; 11.750; 12.375 1,935 Ductile Iron
      Double-Acting 12-1/2ZM:UM:ZL:UL 12.000; 12.250; 12.500 1,350 Ductile Iron
      Double-Acting 13-5/8ZM:UM:ZL:UL 13.125; 13.625 1,085 Ductile Iron
      Bore
       
      Pressure
       
      Operation Class BORE (mm) MAWP (bar) Material
      Double-Acting 4-5/8Z:U-VS 108; 111; 117 414 Forged Alloy Steel
      Double-Acting 4-5/8Z:U-TR-VS 108; 117 462 Forged Alloy Steel
      Double-Acting 5-3/8Z:U-VS 127; 137 414 Forged Alloy Steel
      Double-Acting 5-3/8Z:U-TR-VS 127; 137 462 Forged Alloy Steel
      Double-Acting 6-1/4Z:U 149; 159 168 Ductile Iron
      Double-Acting 6-1/4Z:U-VS 149; 159 310 Forged Alloy Steel
      Double-Acting 7-1/4Z:U 171; 184 167 Ductile Iron
      Double-Acting 7-1/4Z:U-VS 171; 178; 184 241 Forged Alloy Steel
      Double-Acting 8-3/8Z:U 200; 213 165 Ductile Iron
      Double-Acting 9-5/8Z:U 232; 244 131 Ductile Iron
      Double-Acting 11Z:U 267; 279 88 Ductile Iron
      Double-Acting 12-1/2Z:U 317; 500 55 Ductile Iron
      Double-Acting 12-1/2Z:U 317; 500 117 Ductile Iron
      Double-Acting 14-1/8Z:U 346; 359 56 Ductile Iron
      Double-Acting 14-1/8Z:U 346; 359 88 Ductile Iron
      Double-Acting 15-7/8Z:U 391; 403 44 Ductile Iron
      Double-Acting 15-7/8Z:U 391; 403 58 Ductile Iron
      Double-Acting 17-7/8Z:U 441; 454 31 Ductile Iron
      Double-Acting 17-7/8Z:U 441; 454 44 Ductile Iron
      Double-Acting 20-1/8Z:U 498; 511 24 Ductile Iron
      Double-Acting 22Z:U 559 20 Ductile Iron
      Double-Acting 24-1/8Z:U 613 19 Ductile Iron
      Double-Acting 26-1/2Z:U 673 16 Ductile Iron
      Double-Acting 13ZN:UN 330 93 Ductile Iron
      Double-Acting 9-1/4ZK:UK 222; 235 165 Ductile Iron
      Double-Acting 9-3/4ZM:UM:ZL:UL 222; 235; 248 117 Ductile Iron
      Double-Acting 10-3/8ZM:UM:ZL:UL 251; 264 131 Ductile Iron
      Double-Acting 11ZM:UM:ZL:UL 260; 273; 279 117 Ductile Iron
      Double-Acting 11-3/8ZM:UM:ZL:UL 276; 289 117 Ductile Iron
      Double-Acting 12-3/8ZM:UM:ZL:UL 286; 298; 314 133 Ductile Iron
      Double-Acting 12-1/2ZM:UM:ZL:UL 305; 317; 500 93 Ductile Iron
      Double-Acting 13-5/8ZM:UM:ZL:UL 333; 346 75 Ductile Iron

    • Parts

      Ariel original equipment parts


    • Genuine Ariel Parts

      Ariel original equipment parts are designed, engineered, and manufactured specifically for your JG or JGAJGC or JGDJGE, JGK, or JGTJGJJGHJGM or JGPJGN or JGQJGRKBV or KBBKBZ or KBU compressor. Discover why Ariel's comprehensive parts program will maximize the life of your compressor.

      Explore Ariel Parts

      Trusted Ariel Distributors

      Ariel OEM parts are marketed through a long-established network of qualified distributors who have unmatched expertise in the compression industry. Our distributors are available to help you select the best parts and services required to maintain the efficiency and dependability of your Ariel compressor.

      Find A Distributor


    • Support

      Ariel is committed to supporting our compressors for life. We pride ourselves on the manufacturing practices and engineering support behind our world class compression technologies. Through unmatched customer service and a global distribution network, Ariel will provide you with best-in-class compression solutions that reduce downtime and improve application performance.