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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.
• 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).
Technical Data280barSee PRESSURE DROP VS.FLOW graph.SUN T-11ARefer to "Cleanliness of Hydraulic Fluid"215bar5 drops/min.3:1-40ºF to +250ºF(-40ºC to +120ºC)Mineral-based fluids with viscosities of 7.4 to 420 cSt.6061-T6 aluminum alloy rated to 207bar, Steel & Ductile iron rated to 350bar
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