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Pressure-actuated valves control the flow of the water to the nozzle(s). During bypass mode, all of the water is directed back to the supply at nearly zero pressure. This valve is typically used in applications in which frequent on/off action is required at the nozzle, such as; pressure washer, central cleaning station or hydro-excavation. While slightly different design concepts are used, these unloaders typically will actuate at 5 to 20% above the operating pressure of the system.

Flow ranges are from 0.5 GPM (2 l/min) to 625 GPM (2366 L/min) and pressure range is from 100 PSI to 50,750 PSI (7 to 3500 Bar). In lower pressure applications, a manually adjusted spring is used to control the flow; however, pneumatic and electric controls can also be used. Typical metal materials are forged brass, 303 stainless steel, 316 stainless steel and elastomers will be either Nitrile, Viton or Teflon.

For individual specifications see below.

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

Specification US Metric
Maximum Flow53 GPM200 L/min
Max Pressure1015 PSI70 bar
Intermittent Temperature194 °F91 °C
Continuous Temperature140 °F60 °C
Inlet Port1" FNPT
Outlet Port1" FNPT
Bypass Port1" FNPT
Weight4.4 lbs.2 kg
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.
Repair Kit – Part #09182
2 08712 O-Ring 2
5 04108 O-Ring 1
7 08719 O-Ring 1
8 08718 Seat 1
9 08717 Shutter 1
10 08716 O-Ring 1
12 08714 Piston Housing 1
13 04106 O-Ring 1
22 08709 Back Ring 1
23 08710 O-Ring 1


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  • Giant Industries Limited Warranty
  • 22091 Literature


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