Skip to main content
Service
Pumps
Contact
Search
Featured Image for 22981-40

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

Specification US Metric
Minimum Flow2.1 GPM8 L/min
Maximum Flow79.3 GPM300 L/min
Min Pressure580 PSI40 bar
Max Pressure2175 PSI150 bar
Continuous Temperature150 °F70 °C
Inlet Port1" BSP
Outlet Port1" BSP
Bypass Port3/4" BSP
Weight15.4 lbs.7 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.
ITEM# PART# DESCRIPTION Qty.
Repair Kit – Part #09578-40
14 13247 Piston 1
15 05256 Seal Support 1
16 12021 Hexagon Nut 1
18 13012 O-Ring 1
20A 07281 O-Ring 1
21 07840 Support Ring 1
21A 13253 Support Ring 1
22 13254 Seal Pack 1
22A 13255 Seal Pack 1
23 13256 Valve Seat 2
25 12057 O-Ring 2
26 12055 O-Ring 1
28B 07653 O-Ring 1

Literature

Documents open in new window/tab.

  • Giant Industries Limited Warranty
  • 22981-40 Literature

Materials

Sample Pump

Our Company

For 50 years, Giant Pumps has offered the most dependable positive displacement high-pressure triplex pumps available. Designed and built to the highest quality standards, customers count on Giant Pumps products to keep their equipment running. Every design detail of Giant Pumps products is optimized for long-life and reliable performance, making Giant Pumps the most trusted name in high-pressure pumps and systems.

Learn More

Join Our Newsletter

Get the latest updates from Giant Pumps delivered right to your inbox!

Subscribe to the Giant Newsletter

Back to Top