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.
|Full Repair Kit – Part #09321|
|Seal Repair Kit – Part #09322|
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.