Sun Hydraulics designs a broad array of products that defy conventional categorization, which we call circuit savers. These enabling products are useful devices that often help machine designers get around difficult and perplexing circuit problems. Check this product area periodically to see new, unusual and helpful products that are challenging to explain.

  • Pilot-to-close check valves
  • Pilot unloading valves with or without check for accumulator and braking circuits
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Fixed Orifice, Flow Fuse Valve

  • Maximum operating pressure = 5000 psi
  • Maximum valve leakage = FQCA: 2 in³/min. at 1000 psi, FQEA: 3 in³/min. at 1000 psi, FQGA: 4 in³/min. at 1000 psi, FQIA: 5 in³/min. at 1000 psi.
  • Valve closes when flow from port 1 to port 2 exceeds the setting of the valve. Valve resets when pressures at port 1 and port 2 are equal.
  • Flow setting should be at least 25% above maximum normal system flow.
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Air Bleed and Start-up Valve

  • Maximum operating pressure = 5000 psi
  • Air-bleed and start-up valves require a minimum of 4 GPM flow rate and 80 psi system pressure.
  • The valve will re-open when system pressure falls below 25 psi.
  • After air has been purged, closing times vary from approximately 12 seconds at 4 GPM to 0.5 seconds at 50 GPM.
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Check, Pilot-to-Close

Pilot Ratio 120:1

  • Maximum operating pressure = 5000 psi
  • Pilot ratio = 120:1
  • Leakage rate when closed = 5 drops/min.
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Check, Pilot-to-Close

Pilot Ratio 1.8:1

  • Maximum operating pressure = 5000 psi
  • Pilot ratio = 1.8:1
  • Leakage rate when closed = 1 drop/min.
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Accumulator Sense, Pump Unload Valve - Pilot Capacity

  • Maximum operating pressure = 5000 psi
  • When applying this cartridge, a separate drain line is required to prevent erratic operation caused by tank line pressure fluctuations.
  • Note: Careful consideration should be given when selecting an adjustment range. System pressure drops and flows tend to affect the operation of unloading valves.
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Accumulator Sense, Pump Unload Valve with Check - Pilot Capacity

  • Maximum operating pressure = 5000 psi
  • Check valve capacity = 12 GPM
  • Free flow check cracking pressure = 4 psi
  • Pressure drop, port 1 to port 2 = 70 psi at 12 GPM
  • When applying this cartridge, a separate drain line is required to prevent erratic operation caused by tank line pressure fluctuations.
  • Note: Careful consideration should be given when selecting an adjustment range. System pressure drops and flows tend to affect the operation of unloading valves.
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Direct Acting, 2-way Directional Valve with Drain to Port 4 - Normally Closed

  • Maximum operating pressure = 5000 psi
  • The pilot area (port 1) and the spring chamber drain (port 4) are positively sealed.
  • There is spool leakage between the work ports (ports 2 and 3), 0.03 in³/min. at 1000 psi.
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Direct Acting, 2-way Directional Valve with Drain to Port 4 - Normally Open

  • Maximum operating pressure = 5000 psi
  • The pilot area (port 1) and the spring chamber drain (port 4) are positively sealed.
  • There is spool leakage between the work ports (ports 2 and 3), 0.03 in³/min. at 1000 psi.
CS-VtoS2PDVNC.jpg

Vent-to-shift 2-position Diverter Valve - Normally Closed

  • Maximum operating pressure = 5000 psi
  • Nominal vent flow = DSCX. DSEX: 23 in³/min., DSGX, DSIX: 35 in³/min.
  • There must be a pressure source at port 3, relative to port 1, to shift the valve.
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Vent-to-shift, 2-position, 3-way Diverter Valve

  • Maximum operating pressure = 5000 psi
  • Nominal vent flow = DSCY. DSEY: 23 in³/min., DSGY, DSIY: 35 in³/min.
  • There must be a pressure source at port 3, relative to port 1, to shift the valve.
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Normally Open, Bi-directional, Modulating Logic Element

  • Maximum operating pressure = 5000 psi