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This is a pressure-actuated unloader that is designed for any pump that fits within the flow and pressure range of the unloader. The unloader regulates the flow in the system and maintains system pressure via an adjustable hand-wheel that controls the amount of tension on a pressure spring. When no flow is going out the outlet port, all flow is diverted to the bypass port at virtually no pressure. The unloader is capable of handling one or more shut-off guns and should be run with no bypass (if the full flow from the pump is going through the unloader). It actuates at around 10% above the system pressure. The unloader features a panel mount connection.

WARNING: This product might contain a chemical known to the State of California to cause cancer, and birth defects or other reproductive harm. For more information go to

Specification US Metric
Minimum Flow1.3 GPM5 L/min
Maximum Flow5 GPM19 L/min
Min Pressure580 PSI19 bar
Max Pressure4000 PSI276 bar
Continuous Temperature160 °F70 °C
Inlet Port3/8" FNPT
Outlet Port3/8" FNPT
Bypass Port1/4" BSP
Gauge Port1/4" BSP
Weight2.1 lbs.0.95 kg
The repair kits listed to the right are available for this pump. If you need further information about these repair kits, or have questions about other specific parts for your pump, please contact you local Giant distributor or contact Giant customer service.
Full Repair Kit – Part #09163
3 07913 O-Ring 1
6 12305 Spacer Ring 1
7 12018 Support Ring 2
8 11507 O-Ring 1
10 03001 O-Ring, Piston 1
11 08324 Backup Ring. Piston 1
15 12007 O-Ring 2


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  • Giant Industries Limited Warranty
  • 22765APM-SS Literature


Sample Pump

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For 50 years, Giant Pumps has offered the most dependable positive displacement high-pressure triplex pumps available. Designed and built to the highest quality standards, customers count on Giant Pumps products to keep their equipment running. Every design detail of Giant Pumps products is optimized for long-life and reliable performance, making Giant Pumps the most trusted name in high-pressure pumps and systems.

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