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 hand-wheel 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. The unloader features a panel mount connection.

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
  • 22765APM-SS Literature


U.S. Metric
Manimum Flow 5 GPM 19 L/min
Minimum Flow 1.3 GPM 5 L/min
Pressure (Maximum) 4000 PSI 276 bar
Pressure (Minimum) 580 PSI 19 bar
Maximum Temperature 160 ºF 70 ºC
Inlet 3/8″ FNPT
Outlet 3/8″ FNPT
Bypass Port (2) 1/4″ BSP
Gauge Port 1/4″ BSP
Weight 2.1 lbs 0.95 kg


Full Repair Kit – Part #09163
3 07913 O-Ring 1
6 12305 Spacer Ring 1
7 12018 Support Ring 2
8 11507 O-Ring 1
10 03001 O-Ring, Piston 1
11 08324 Backup Ring. Piston 1
15 12007 O-Ring 2

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.