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
  • 22083-SS Literature


U.S. Metric
Flow (Side Inlet) 21.1 GPM 80 L/min
Flow (Bottom Inlet) 10.6 GPM 40 L/min
Pressure (Maximum) 2320 PSI 160 bar
Pressure (Permissible) 2610 PSI 180 bar
Intermittent Temperature 194 ºF 90 ºC
Continuous Temperature 140 ºF 60 ºC
Inlet 1/2″ NPT
Outlet 1/2″ NPT
Bypass 1/2″ NPT
Weight 6.7 lbs 3.0 kg
Materials Brass


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

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.