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

Cavity 21A-4
Rated Flow 15.85 gpm 60 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
Maximum Leakage Approximately 0.7 cc/min at 5000 psi 0.7cc/min at 350 bar
Weight 0.42 lbs (Z=L) 0.19 kg (Z=L)
This is a balanced poppet, normally open, logic element valve. The valve remains closed until the pilot pressure applied at port 3 exceeds the valve setting determined by the integral pilot relief stage. The poppet shifts, blocking the flow path between port 1 and port 2.

  • The maximum leakage is approximately 0.7 cc/min at 350 bar (5000 psi), with a very low leakage rate between port 1 and port 2.
  • All ports can withstand up to 350 bar (5000 psi).
  • When the pilot pressure drops to setting approximately 85 % of cracking value, the valve will return to the spring biased closed position.
  • Back pressure at port 4 (drain) adds directly to the relieving setting at a 1:1 ratio.
  • 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.
  • Recommendation of minimum pilot pressure required to shift valve is 28 bar (port 3).
pressure differential versus flow curve for LN21A4P balanced poppet, normally open, logic element valve, showing pressure and flow characteristics during piloted opening