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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 nut 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 20% above the system pressure.

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
Maximum Flow53 GPM200 L/min
Max Pressure2175 PSI150 bar
Intermittent Temperature194 °F91 °C
Continuous Temperature140 °F60 °C
Inlet Port1" FNPT
Outlet Port1" FNPT
Bypass Port1" FNPT
Weight4.4 lbs.2 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.
Repair Kit – Part #09182
2 08712 O-Ring 2
5 04108 O-Ring 1
7 08719 O-Ring 1
8 08718 Seat 1
9 08717 Shutter 1
10 08716 O-Ring 1
12 08714 Piston Housing 1
13 04106 O-Ring 1
22 08709 Back Ring 1
23 08710 O-Ring 1


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  • Giant Industries Limited Warranty
  • 22090 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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