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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 Flow, Side Inlet21.1 GPM80 bar
Maximum Flow, Bottom Inlet10.6 GPM40 bar
Max Pressure2320 PSI160 bar
Maximum Intermittent Pressure180 bar
Permissible Pressure2610 PSI
Permissible Pressure180 bar
Intermittent Temperature194 °F90 °C
Continuous Temperature140 °F60 °C
Inlet Port1/2" NPT
Outlet Port1/2" NPT
Bypass Port1/2" NPT
Weight6.7 lbs.3 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.
Plunger Packing Kit – Part #09712
2 08736 O-Ring 2
4 05906 Support Ring 1
5 05907 O-Ring 1
7 05908 Seat 1
8 04332 O-Ring 1
9 05565 Ball 1
14 08588 Support Ring 1
15 08587 O-Ring 1
16 08770 O-Ring 1
19 05909 O-Ring 1


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  • Giant Industries Limited Warranty



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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