L3 Compact Liquid Pumps

Product Features and Specifications

  • General Product Information
    • schydraulic-l3pump

      SC air driven compact liquid pumps operate on the principal of differential areas. An air piston drives a smaller diameter hydraulic plunger to provide a pressure ratio. The pressure ratio determines the maximum outlet pressure.

      SC compact liquid pumps cycle automatically. When compressed air is first applied to the pump, it will cycle at its maximum speed producing maximum flow. At this stage, the pump is acting as a transfer pump filling the pressure receiver with liquid. The pump will then gradually start to cycle at a slower rate as the pressure in the receiver increases and offers more resistance to the reciprocating differential piston.

      SC pumps stop automatically when the output pressure force and the air drive force is balanced to create a stall condition. At this point, the pump will maintain pressure without energy consumption, thus providing an economical source for hydraulic power.

      SC pumps will cycle with a slight drop in the outlet pressure or increase in the air drive pressure due to very low frictional resistance.

      SC pumps are suitable for use on scissor jack lifts, aircraft jacks, clamping devices, punches and pin presses, valve actuation, roller tensioning, torque wrenches, press system overload, pressure testing, crimping, trash compactors, paper and printing paper cutters.

      Compatible with all hydraulic fluids, plain water, distilled and di-ionized water, solvents, mild chemicals and liquefied CO2.

      316 Stainless steel wetted hydraulic construction, light weight (six pounds), 3.5" x 7.00" body includes inlet and exhaust muffler.

      Available in eight ratios: 15, 25, 35, 45, 65, 105, 125 and 195.

      Requires less than 15 psi air drive pressure to operate, the L3 series pump is self priming for immediate operation. Maximum air drive pressure is 125 psi (intermittent duty)

      Can supply pressures up to 24,375 psi @ 125 psi air drive and flow rates up to 1.0 gpm.

      Requires no electrical power or connections.

      Alternative gases that can drive the pump include nitrogen vapor from liquefied gas or natural gas pipeline, thus offering a completely self-contained package independent of external power sources.

      Hand pump attachment option allows for manual operation when shop air is not available or for precision pressure control.

  • Applications
    • Crimping
      Valve actuation
      Pressure testing
      Torque wrenches
      Clamping devices
      Trash compactors
      Well Control Panels
      Press system overload
      Punches and pin presses
      Roller and bolt tensioning
      Scissor jack lifts, aircraft jacks
  • Dimensions
    • Dash
      Max Pressure
      psig @125 Pa (1)
      Per Cycle
      Cu. In.
      NPT/LF4 (Std) SAE/LF4 (Optional) C D L
      A Thread B Thread A Thread B Thread B Thread
      -15 20 2,250 0.27 3/8" 1/4" -8 SAE -6 SAE 7/16-20 * 1.5 2.43 8.02
      -25 31 3,500 0.18 3/8" 1/4" -8 SAE -6 SAE 7/16-20 * 1.5 2.43 8.02
      -35 40 4,375 0.14 3/8" 1/4" -8 SAE -6 SAE 7/16-20 * 1.5 2.43 8.02
      -45 55 6,125 0.1 3/8" 1/4" -8 SAE -6 SAE 7/16-20 * 1.5 2.43 8.02
      -65 79 8,875 0.069 1/4" 1/4" -6 SAE -6 SAE 7/16-20 * 1 1.93 7.52
      -105 123 14,000 0.044 1/4" 1/4" -6 SAE -6 SAE 7/16-20 * 1 1.93 7.52
      -125 138 15,600 0.044 1/4" 7/16-20 * -6 SAE - - 1 1.93 7.52
      -195 213 24,375 0.038 3/8" 9/16-18 - - - 2.24 2.71 8.75

      *Coned and threaded high pressure connection for 20KSI O.D. tubing
      (1) Maximum static outlet pressure. Do not exceed 125-psi of air supply pressure

  • Ordering
    • TABLE 1 Pump Series Designation (1)
      L3 Compact Pump Stainless Steel Hydraulic Section
      L3C Compact pump Carbon Steel Hydraulic Section
      TABLE 2 Seal Compound - Hydraulic Section
      Blank Std- Buna-N O-rings, UHMWP/CG-PTFE Main Seal (3)
      Blank Std- Buna-N O-rings, Polyurethane Main Seal
      03 EPR O-rings, Polyurethane Main Seal
      04 Viton O-rings, Polyurethane Main Seal
      TABLE 3 Modifications
      Blank Standard - No Modifications
      M002 Remote Pilot
      M003 SAE Straight Thread Ports
      M004 Hand Pump Attachment
      M005 Distance Piece—Isolator
      M006 No Air Piston Return Spring
      M008 Noise Reduction
      M009 7/16"-20 x 1/4" High Pressure Fitting Outlet
      M011 7/16-20 x ¼" Mounting Holes
      M027 Hand Pump Attachment - 195 Ratio
      TABLE 4 Actual Pressure Ratio (1)
      Blank Standard - No Modifications
      15 20:1 Actual Ratio
      25 31:1 Actual Ratio
      35 40:1 Actual Ratio
      45 55:1 Actual Ratio
      65 79:1 Actual Ratio
      105 123:1 Actual Ratio
      125 133:1 Actual Ratio
      195 213:1 Actual Ratio
      Notes: (1) Do not fill gap on a two digit description
      (2) Additional Special Modifications may be included with an "M" suffix at the end of the model number.
      (3) Available only for L3-195
  • Modifications
    • M002 - Remote Pilot: This option provides for a separate 1/8" NPT external air to pilot cycling valve. Useful for remote control operation of the pump.


      M003 - Straight Threads: The straight thread modification offers the fluid inlet and outlet ports with SAE straight thread options.

      M004 & M027 - Integral Hand Pump Attachment: This modification permits supplementary operation of the pump by hand. Useful in precise testing or emergency back-up applications requiring a hand pump in addition to pneumatic power. schydraulic-m004mod
      M005 - Distance Piece: The distance piece models are furnished with an isolator attachment which prevents the hydraulic piston from retracting into the air drive during operation, thus providing 100% separation of the hydraulic assembly from the air drive assembly. The isolator attachment prevents contamination and acts as a heat barrier. schydraulic-m005mod
      M006 - No Air Piston Return Spring: This modification provides improved fill on the suction stroke when pumping liquefied gases such as CO2.
      M008 - Noise Reduction: Noise reduction incorporates a special internal bumper allowing the pump to run quieter without impairing performance.
      M009 - 1/4" O.D. High Pressure Tubing Fluid Outlet: This modification provides a coned and threaded high pressure connection for 20 KSI 1/4" O.D. tubing (7/16-20 thread LF4 connection).
      M011 - Mounting Holes: Tapped and threaded bottom mounting holes are available for tank top mounting applications. schydraulic-m011mod
  • Performance Chart
    • schydraulic-l3-15perfchart schydraulic-l3-25perfchart schydraulic-l3-45perfchart.png schydraulic-l3-65perfchart schydraulic-l3-105perfchart schydraulic-l3-125perfchart schydraulic-l3-195perfchart