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Technical Feature
OPERATION:
Counterbalance valves with pilot assist are meant for control on overrunning load. The
check valve allows free flow from port ② to port ① while a direct-acting, pilot-assisted
relief valve controls flow from port ① to port ② . Pilot assist at port ③ lowers the
effective setting of the relief valve at a rate determined by the pilot ratio.FEATURES:
• Counterbalance valves should be set at least 1.3 times the maximum load induced
pressure.
• Backpressure at port ② adds to the effective relief setting at a ratio of 1 plus the pilot
ratio times the backpressure.
• Reseat exceeds 85% of set pressure when the valve is standard set. Setting lower than
the standard set pressure may result in lower reseat percentages.
• Factory pressure setting established at 30cc/min(2 in3/min). -
PerformanceCurves
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Technical Data
Operating Pressure350barFlowSee PRESSURE DROP VS.FLOW graph.CavityHYDAC FC06-3FiltrationRefer to "Cleanliness of Hydraulic Fluid"Max.Recommended Load Pressure at Max.Setting270barCrack Pressure1.7barInternal Leakage5 drops/min max.Standard Spring Ranges13.8 to 350 bar; preset： 228barPilot Ratio4:1Temperature-40ºF to +250ºF(-40ºC to +120ºC)FluidsMineral-based fluids with viscosities of 7.4 to 420 cSt.Body MaterialSteel & Ductile iron rated to 350bar -
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