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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 knob 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.  This unloader design requires a partial bypass to operate.

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 Flow10.5 GPM40 L/min
Max Pressure5100 PSI350 bar
Maximum Intermittent Pressure5655 PSI
Intermittent Temperature195 °F90 °C
Continuous Temperature140 °F60 °C
Inlet Port3/8" MBSP
Outlet Port3/8" FNPT
Bypass Port1/2" FBSP
Weight1.8 lbs.0.82 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 #09183
2 08573 O-Ring 2
5 05457 O-Ring 1
7 05459 Seat 1
8 05460 Piston 1
9 08706 O-Ring 1
11 05462 Stem Seal 1
12 08719 O-Ring 1
16 05465 Piston Seal 1
18 08624 Ball S.S. 11/32″ 1


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  • Giant Industries Limited Warranty
  • 22085 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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