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Flow Sensitive Unloader 13.2GPM 5800PSI

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10.00 lbs
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An unloader with a flow-balanced piston for precise pressure adjustment. Allows high-pressure spraying equipment to start smoothly and softly. It handles a maximum flow rate of 13.2 GPM and pressure of 5800 PSI.


Product Description

13.2 GPM Flow-Sensitive Unloader Valve

Thanks to its flow-balanced piston, the General Pump ZK9 flow-sensitive unloader is able to make precise pressure adjustments and safely eliminate discharge line pressure when in the bypass mode. The unloader is designed so there are no external moving parts. Internal components are made with brass, stainless steel, and Buna-N. It delivers smooth, soft starts for a wide range of high-pressure spraying equipment. The valve is engineered to endure a maximum pressure of 5800 PSI and a flow rate of 13.2 GPM.


  • Manufacturer: General Pump
  • Model Number: ZK9
  • GPM: 2.5 to 13.2
  • Max PSI: 5800
  • Inlet: 1/2" BSP-F
  • Outlet: 1/2" BSP-M
  • Bypass: 1/2" BSP-F
  • Temperature: 165° F
  • Dimensions: 7.7" x 5.3" x 2.5"
  • Materials: Brass, Stainless Steel, Buna-N
  • Weight: 10 lbs.

Product Reviews

Frequently Asked Questions

Question:Is this unloader available in 3/8 for the inlet and outlet? - Anthony (06/15/2021)
Response:No, it is only available in ½”