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These 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; however system pressure remains constant (or slightly higher). This valve is typically used for applications which require frequent on/off action, such as a car wash application. However, they are more frequently used in applications that require a constant pressure at the point of use. They also are used whenever the driver of the pump is turned on/off, such as misting systems. While slightly different design concepts are used, typically these unloaders 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 Flow6.6 GPM25 L/min
Min Pressure0 PSI0 bar
Max Pressure2000 PSI140 bar
Maximum Temperature194 °F90 °C
Inlet Port3/8" FNPT
Outlet Port with Injector3/8" MNPT
Outlet Port without Injector3/8" FNPT
Bypass Port3/8" FNPT
Weight2 lbs.0.91 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.
Full Repair Kit – Part #09321
4 07770 O-Ring 1
5 08553 Support Ring 1
6 07915 O-Ring, Piston 2
8 08691 Piston 1
9 22659 O-ring 1
10 08563 Seat 1
17 08559 Support Ring 1
18 12326 O-Ring 1
19 07913 O-Ring 1
23 08564 O-Ring 1
Seal Repair Kit – Part #09322
4 07770 O-Ring 1
5 08553 Support Ring 1
6 07915 O-ring, Piston 2
9 22659 O-Ring 1
17 08559 Support Ring 1
18 12326 O-Ring 1
19 07913 O-Ring 1
23 08564 O-Ring 1


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  • Giant Industries Limited Warranty
  • 23295RH Literature


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