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 10% above the system pressure.

  • Giant Industries Limited Warranty
  • 22980 Literature


U.S. Metric
Flow (Minimum) 2.1 GPM 8.0 L/min
Flow (Maximum) 26.4 GPM 100 L/min
Pressure 72500 PSI 500 bar
Continuous Temperature 160 ºF 70 ºC
Inlet 3/4: BSP
Outlet 1/2″ BSP
Bypass 1/2″ BSP
Weight 15.4 lbs 7.0 kg


Repair Kit – Part #09543
14 06687 Piston 1
15 06715 Seal Support 1
16 06713 Hexagon Nut 1
18 12004 O-Ring 1
21 07392 Support Ring 1
21A 06718 Support Ring 1
22 07391 Seal Pack 1
22A 06717 Seal Ring 1
23 08523 Valve Seat 2
25 07489 O-Ring 2
26 12057 O-Ring 2
29 08531 Valve Plate 1
30 12216 Valve Spring 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.