Cartridge Valves
  • Technical Data
  • Product Description
  • Performance Curve
  • Application Example
  • Technical Reference
  • Files

Note: Data may vary by configuration. See CONFIGURATION section.

Cavity 21A-4
Rated Flow Ports 1 to 2:15.85 gpm, Ports 3 to 4: 0.21 gpm Ports 1 to 2:60 L/min, Ports 3 to 4: 0.8 L/min
Maximum Operating Pressure 5000 psi 350 bar
Valve Hex Size 7/8 in. 22.22 mm
Valve Installation Torque 30 - 37 lbf-ft 40 - 50 Nm
Adjustment Screw Internal Hex Size 5/32 in. 4 mm
Locknut Hex Size 9/16 in. 14.27 mm
Locknut Torque 6 - 7 lbf-ft 9 - 10 Nm
Weight 0.42 lbs 0.19 kg
This is a direct-acting, spool type, accumulator sensing, pump unloading valve, featuring optional unload/reload pressure ratios for use in accumulator-type hydraulic systems. Port 2 is the accumulator port; when the pressure at port 2 reaches the predetermined setting, port 3 (unload) connects to port 4 (drain) to vent a relief valve and unload the pump. This allows flow from port 3 to port 4. When the pressure at port 2 falls below the setting, flow between port 3 and port 4 is blocked, and the pump will return to recharge the accumulator. For higher capacity pumps, we offer an alternative option: the accumulator sense, pump unload valve (QP-11A-X-Y-Z). Please note that this version requires the use of a separate check valve for proper functionality.

  • Note: careful consideration should be given when selecting an adjustment range. System pressure drops and flows tend to influence the operation of unloading valves.
  • Working parts are heat-treated and high-precision ground to increase hardness for long life.
  • A variety of seal kit materials for different applications, see seals information under Technical Reference.
  • Winner's cartridges pressure rating tested to the standard of the NFPA specification T2.6.1 and the fatigue rating's assurance and verification level is “90/90”.
  • WINNERcoat® Zinc-Nickel Plating is salt spray tested in accordance with DIN EN ISO 9227 for up to 1000 hours.
  • Winner guarantees that all products performance a 100% functional test before shipment.