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Featured Image for 22650A

This is a flow-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 does not “trap” pressure, so it eliminates the need for an easy start valve and virtually eliminates the “kick-back” (that occur with pressure-actuated type of unloaders) upon start up.

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
Minimum Flow3 GPM11.3 L/min
Maximum Flow4.5 GPM17 L/min
Minimum Pressure0 PSI0 bar
Maximum Pressure3000 PSI207 bar
Tempurature Rating160 °F70 °C
Inlet Port3/8" FNPT
Outlet Port3/8" FNPT
Bypass Port3/4" MNPT
Weight2 lbs.0.9 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.
Short Repair Kit – Part #22666A
5 22640 O-Ring, Seat 1
9 22641 Shim 1
10 22608 O-Ring 1
16 22618 O-Ring, Nipple 1
18 22622 O-Ring, Sleeve 1
21 22603 O-Ring 2
23 22792 Snap Ring 1
25 22659 O-Ring 1
Long Repair Kit – Part #22688A
1 22601 Nut 1
2 22602 Valve Cone 1
3 22661 Piston Rod 1
4 22660 Seat 1
5 22640 O-Ring, Seat 1
6 22696B Piston 1
7 22691 Spring 1
7A 22689 Helper Spring 1
8 22694 Cone Washer 1
10 22608 O-Ring 1
18 22622 O-Ring, Sleeve 1
21 22603 Piston ring 2
23 22792 Snap Ring 1
24 22642 Bypass Plate 1



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  • Giant Industries Limited Warranty
  • 22650A Literature



Sample Pump

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