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 www.P65Warnings.ca.gov

  • Giant Industries Limited Warranty
  • 22090 Literature


U.S. Metric
Flow 53 GPM 200 L/min
Pressure (Maximum) 2175 PSI 150 bar
Continuous Temperature 140 ºF 60 ºC
Maximum Temperature (short periods) 194 ºF 91 ºC
Inlet 1″ FNPT
Outlet 1″ FNPT
Bypass 1″ FNPT
Weight 4.4 lbs 2.0 kg


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

Repair Kits Available

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.

Service & Repair

Giant provides service on each pump and accessory that we sell. Many basic repair procedures are covered in the Giant repair manual. For all other questions on service or repair needs please contact your local Giant distributor.