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
  • 22947 Literature


U.S. Metric
Flow (Maximum) 60 GPM 225 L/min
Flow (Minimum) 2.1 GPM 8.0 L/min
Pressure (Maximum) 1160 PSI 80 bar
Pressure (Minimum) 300 PSI 20 bar
Continuous Temperature 160 ºF 70 ºC
Inlet 1″ FNPT
Outlet 1″ FNPT
Bypass 1″ BSP
Weight 17.5 lbs 8.0 kg
Materials Brass


Repair Kit – Part #09813
4 12045 Spring, Discharge Valve 1
4A 12118 Spring, Inlet Valve 1
5 12046-0100 Ball Valve, Inlet 1
6 06733 Valve, Discharge 1
11 06577 O-Ring 3
12 12056 Support Ring 2
13 12057-0001 O-Ring, Discharge Valve Seat 1
14 06736 O-Ring 2
17 04847 O-Ring for 15 1
17A 04848 Support Ring 2
19A 22618 O-Ring, Valve Stem 1
19B 12064 Spacer, Valve Stem 2
19D 12066 Tension Sleeve 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.