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High-Flow/Low-Pressure & Low-Flow/High-Pressure Circuits

The circuits shows one pump for high pressure/low flow and another pump for high flow/low pressure driven by the same electric motor and feeding the same user. Both circuits unload pumps without decompression shock in the system.

  • Standard counterbalance valve:   CB**, CB*J
  • Pressure relief valves:                  RD*A
  • Balanced logic valves:                  DK*S
  • Pressure-reducing valves:            PR*R
  • Y Assemblies:                              YRES (Series 2) , YRGJ  (Series 3), YRIA  (Series 4)


Benefits of this circuit arrangement:

  • Fig.1 shows a CB unload the high-flow pump at a preset high pressure.
  • Fig.2 shows a balanced logic valve unload the high-flow pump at a preset high pressure.
  • The circuit allows the use of one motor with limited power to drive a double pump for either high flow or high pressure. When the system pressure rises, the high-flow pump is unloaded to tank to limit the power requirement from the electric motor.

For Sun technical support, contact Bernhard Kristen.

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