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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 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 Flow10.5 GPM40 L/min
Max Pressure3625 PSI250 bar
Continuous Temperature194 °F90 °C
Inlet Port3/8" BSP
Outlet Port3/8" BSP
Bypass Port(2) 1/4" BSP
Weight1.9 lbs.0.85 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 #09749
12 16269 Seat, Stainless Steel 1
13 16268 Ball 1
14 05494 Spring 1
15 05496 Self Locking Nut 2
19 05499 O-Ring 1
20 05500 Support Ring 1
21 05501 O-Ring 1
22 05502 O-Ring 1
24 05504 Support Ring 1
25 05505 O-ring 1
26 05506 Support Ring 1
29 03664 Kick Back Valve Spring 1
30 04228 Kick Back Valve w/o Spring 1


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  • Giant Industries Limited Warranty
  • 25150 Literature
  • 25150 Dimensions


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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