Electro-Proportional Valves
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Note: Data may vary by configuration. See CONFIGURATION section.

Cavity 2A-3
Rated Flow 31.7 gpm 120 L/min
Maximum Operating Pressure 5000 psi 350 bar
Valve Hex Size 1-1/8 in. 28.57 mm
Valve Installation Torque 44 - 52 lbf-ft 60 - 70 Nm
Response Time-Typical 10 ms
Maximum Leakage Approximately 50 cc/min at 1000 psi 50 cc/min at 70 bar
Weight 0.44 lbs 0.2 kg
This is a pilot-operated, balanced piston, ventable relief valve with an integral 8A-2 pilot control cavity, designed for use with any 8A-2 pressure control cartridge valve. When the pressure at port 1 exceeds the pilot control setting, it pilots open port 2, allowing throttled flow to regulate the pressure. The pressure differential between port 1 and port 2 is determined by the settings of the pilot control. Changes in pressure at port 2 do not affect the pressure setting, making it suitable for sequential applications. This valve is commonly paired with Winner proportional relief valves, such as the PRB8A or PRA8A.

  • When the pressure drop across the relief valve is high, cavitation can easily occur, leading to noise and manifold erosion. If this is a concern, please refer to the balanced poppet type RV-2A-3G-Y-85.
  • Maximum pressure can be accepted at port 2, suitable for use in cross port relief circuits but spool leakage should be considered.
  • The maximum leakage is approximately 50 cc/min at 70 bar (1000 psi).
  • W spring is suitable for higher pressure drop application.
  • Pressure at port 3 is added directly to the valve setting in a 1:1 ratio and must be less than 350 bar (5000 psi).
  • This valve is not proper to use in load holding applications due to spool leakage.
  • 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.
1. Pilot Capacity Proportioanl Relief Valve (direct acting)
PRB-8A-2D-Y-Z
PRB-8A-2C-Y-Z

2. Pilot Capacity Proportioanl Relief Valve (inverse direct acting)
PRA-8A-2C-Y-Z
PRA-8A-2D-Y-Z-74