Enerpac ZA4 Series air hydraulic pumps combine compressed-air power with Enerpac Z-Class hydraulic pump technology for industrial hydraulic systems requiring high hydraulic flow and operating pressures up to 10,000 psi. The modular ZA4 platform is available with multiple valve configurations, reservoir capacities and factory-installed options for matching the pump to the hydraulic application.
ZA4 pumps use two-stage hydraulic operation, providing higher oil flow during rapid cylinder advance before transitioning to high-pressure operation. Enerpac identifies the ZA4 flow group as providing approximately 80 inĀ³/min at 10,000 psi.
Choosing an Enerpac ZA4 Air Hydraulic Pump
The correct ZA4 pump depends primarily on the hydraulic circuit, required valve functionality, usable oil capacity and application requirements. The ZA4 model number provides information about the pump configuration, including valve type and reservoir size.
ZA42 Pumps for Single-Acting Hydraulic Systems
ZA42 configurations use a 3-way, 2-position hydraulic valve. These configurations are appropriate for hydraulic circuits requiring this valve arrangement, including compatible single-acting cylinder applications.
ZA42 pumps are available with different reservoir capacities, allowing the pump to be matched to the total oil volume required by the connected cylinder or hydraulic system.
ZA44 Pumps for Double-Acting Hydraulic Systems
ZA44 configurations use a 4-way, 3-position hydraulic valve for directional hydraulic control. This valve arrangement supports applications requiring powered hydraulic flow in both directions, including compatible double-acting cylinders.
ZA4 Reservoir Capacity Options
Enerpac's ZA4 model-number system incorporates reservoir capacity into the pump designation. Available usable oil-capacity codes include:
- 04: approximately 1.2 gallons.
- 08: approximately 1.8 gallons.
- 10: approximately 2.6 gallons.
- 20: approximately 5.2 gallons.
- 40: approximately 10.3 gallons.
Select reservoir capacity according to the total oil volume required by the connected cylinder or cylinders, hydraulic lines and other components in the system.
ZA4 Two-Stage Hydraulic Performance
During initial cylinder movement at lower hydraulic pressure, the ZA4 platform provides higher hydraulic flow for faster advancement. As system pressure increases, the pump transitions to its high-pressure operating stage.
This makes hydraulic flow, cylinder speed and required oil capacity important considerations in addition to maximum operating pressure.
ZA4 Pump Selection Factors
- Cylinder type: Determine whether the hydraulic system uses a single-acting or double-acting cylinder.
- Valve configuration: Match the hydraulic valve to the required advance, hold and retract functions.
- Operating pressure: Confirm that the pump and every hydraulic component are rated for the required system pressure.
- Usable oil capacity: Select a reservoir large enough for the connected hydraulic equipment.
- Hydraulic flow: Consider required cylinder speed and cycle time.
- Compressed-air supply: Verify that the available air system can meet the requirements of the selected ZA4 configuration.
Need an Air-Driven Torque Wrench Pump?
Hydraulic torque wrenches require the correct torque-wrench valve, couplers and controls. Browse Enerpac ZA4T air-driven torque wrench pumps for dedicated hydraulic bolting configurations. Confirm compatibility between the exact pump, hose and wrench before ordering.
Shop Enerpac ZA4 Air Hydraulic Pumps
Compare Enerpac ZA4 pumps below by model number, valve configuration, hydraulic application and reservoir capacity. For other compressed-air-powered pump platforms, browse the complete selection of Enerpac air hydraulic pumps.
