PPJCBBN - Air-controlled, pilot operated, pressure reducing/relieving valve

Part Number: PPJCBBN

Manufacturer: Sun Hydraulics


Air-controlled, pilot-operated pressure reducing/relieving valves use compressed air over a diaphragm instead of an adjustable spring to control the setting. These valves reduce a high primary pressure at the inlet (port 2) to a constant reduced pressure at port 1, with a full-flow relief function from port 1 to tank (port 3). The air signal is supplied through a port in the hex-end of the cartridge and the hydraulic setting is directly proportional to the air setting at a ratio of 20:1 (hydraulic:air).

  • Full reverse flow from reduced pressure (port 1) to inlet (port 2) may cause the main spool to close. If reverse free flow is required in the circuit, consider adding a separate check valve to the circuit.
  • The pressure at port 3 determines the minimum valve setting and should not exceed 1000 psi (70 bar).
  • The full adjustment range is 50 to 1500 psi (3,5 to 105 bar).
  • Maximum air pressure should not exceed 150 psi (10,5 bar) due to the strength of the diaphragm.
  • Maximum pressure differential, inlet to outlet, should not exceed 3000 psi (210 bar).
  • Pilot operated reducing, reducing/relieving valves by nature are not fast acting valves. For superior dynamic response, consider direct acting valves.
  • The air control feature allows explosion proof remote control.
  • All three-port pressure reducing and reducing/relieving cartridges are physically interchangeable (i.e. same flow path, same cavity for a given frame size). When considering mounting configurations, it is sometimes recommended that a full capacity return line (port 3) be used with reducing/relieving cartridges.
  • Incorporates the Sun floating style construction to minimize the possibility of internal parts binding due to excessive installation torque and/or cavity/cartridge machining variations.

Capacity80 gpm320 L/min.
Pilot Ratio20:120:1
Maximum Operating Pressure2000 psi140 bar
Control Pilot Flow15 - 20 in³/min.0,25 - 0,33 L/min.
Maximum Air Pressure150 psi10,5 bar
Valve Hex Size1 5/8 in.41,3 mm
Valve Installation Torque350 - 375 lbf ft474 - 508 Nm
Locknut Hex Size9/16 in.15 mm
Locknut Torque80 - 90 lbf in.9 - 10 Nm
Model Weight3.10 lb1,40 kg
Seal kit - CartridgeViton: 990-019-006

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