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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 Flow2.2 GPM8.3 L/min
Maximum Flow13 GPM49.2 L/min
Min Pressure375 PSI25.9 bar
Max Pressure2400 PSI165 bar
Continuous Temperature160 °F70 °C
Inlet Port1/2" FNPT
Outlet Port1/2" FNPT
Bypass Port1/2" BSP
Weight2.8 lbs.1.3 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 #12099
3 12004 O-Ring, Valve Cap 1
6 11507 O-Ring, Valve Stem 1
7 11508 Back-up ring, Valve Stem 2
9 04006 Cup (23mm) 1
10 04018 Back-up ring, Piston 1
13B 12092 O-ring, Spring Retainer 2
14A 12094 O-ring, Outlet Valve 1
20A 12017 O-ring, Plug 4
Complete Repair Kit – Part #09530
3 12004 O-Ring, Valve Cap 1
6 11507 O-Ring, Valve Stem 1
7 11508 Back-up ring, Valve Stem 2
9 04006 Cup (23mm) 1
10 04018 Back-up ring, Piston 1
11 12089 Ball, Inlet 1
12 12090 Spring, Outlet Valve 1
12A 12011 Spring. Inlet 1
13B 12092 O-ring, Spring Retainer 2
14 12093 Outlet Valve 1
14A 12094 O-ring, Outlet Valve 1
15 12095 Seat, Inlet Valve (S.S.) 1
15A 12096 Seat, Outlet Valve (Brass) 1
20A 12017 O-ring, Plug 4

Literature

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  • Giant Industries Limited Warranty
  • 22912A Literature

Materials

Sample Pump

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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.

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