Overview

• Pilot operated, spool type screw-in cartridge pressure reducing/relieving valve
• This valve maintains a constant secondary (lower) pressure in hydraulic subsystems regardless of pressure variations in the primary system
• In addition to the reducing function, this valve also provides a flow path from the reduced pressure port to the tank port
• If pressure in the secondary circuit exceeds the desired pressure, the valve opens this flow path to relieve excess pressure to tank
• This valve is normally open, allowing flow from port 2 to port 1; port 3 must be vented
• Once the pressure setting is reached at port 1, the spool shifts to restrict the inlet flow at port 2
• This regulates the pressure at port 1
• If pressure at port 1 exceeds the predetermined setting of the valve, the spool will shift further and relieve excess pressure through port 3