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This is a pneumatically controlled 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
Min Pressure200 PSI15 bar
Max Pressure2200 PSI150 bar
Intermittent Temperature195 °F90 °C
Continuous Temperature140 °F60 °C
Inlet Port1" FBSP
Outlet Port1" FBSP
Bypass Port1" FBSP
Weight8.8 lbs.4 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 #09182P
2 08712 O-Ring 2
4 08719 O-Ring 1
5 08718 Seat 1
6 08717 Shutter Pin 1
7 08716 O-Ring 1
9 08714 Back-Up Ring 1
10 04106 O-Ring 1
13 08710 O-Ring 1
14 08709 Back-Up Ring 1
Repair Kit – Part #09182P-1
22 03073 Stem Seal 1
25 03076 Bushing 1
27 03078 O-Ring 1
32 03083 Piston Seal 2
33 03084 O-Ring 2


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  • 22090P Literature
  • 22090P Installation


Sample Pump

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