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.

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
  • 22984 Literature


U.S. Metric
Flow (Maximum) 79.3 GPM 300 L/min
Flow (Minimum) 2.1 GPM 8 L/min
Pressure (Maximum) 3000 PSI 207 bar
Pressure (Minimum) 580 PSI 40 bar
Continuous Temperature 160 ºF 70 ºC
Inlet 1″ BSP
Outlet 1″ BSP
Bypass 3/4″ BSP
Weight 15.4 lbs 7.0 kg


Repair Kit – Part #09811
14 13247 Piston 1
15 05704 Seal Support 1
16 04036 Hexagon Nut 1
18 13012 O-Ring 1
20A 07281 O-Ring 1
21 07840 Support Ring 1
21A 07904 Support Ring 1
22 13254 Seal Pack 1
22A 08087 Grooved Seal Ring 1
23 13256 Valve Seat 1
25 12057 O-Ring 2
26 12055 O-Ring 1
28B 07653 O-Ring 1
29 13260 Valve Plate 1
30 07750 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.