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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
FlowSee PRESSURE DROP VS.FLOW graph.CavitySUN T-11AFiltrationRefer to "Cleanliness of Hydraulic Fluid"Max.Setting350 barMax.Recommended Load Pressure at Max.Setting270barInternal Leakage5 drops/min.Pilot Ratio4.5: 1Temperature-40°F to +250°F(-40°C to +120°C)FluidsMineral-based fluids with viscosities of 7.4 to 420 cSt.Body Material6061-T6 aluminum alloy rated to 207bar, Steel & Ductile iron rated to 350bar -
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