3:1 pilot ratio, standard capacity counterbalance valve Capacity: 15 gpm (60 L/min.) Functional Group: Products : Cartridges : Counterbalance : 3-Port Non-vented : Standard, 3:1 Pilot Ratio Model: CBCA-LIN Product Description Counterbalance valves with pilot assist are meant to control an overrunning load. The check valve allows free flow from the directional valve (port 2) to the load (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. Other names for this valve include motion control valve and over center valve. Download Technical Features Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. Turn adjustment clockwise to decrease setting and release load. Full clockwise setting is less than 200 psi (14 bar). 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. Settings lower than the standard set pressure may result in lower reseat percentages. Sun counterbalance cartridges can be installed directly into a cavity machined in an actuator housing for added protection and improved stiffness in the circuit. Two check valve cracking pressures are available. Use the 25 psi (1,7 bar) check unless actuator cavitation is a concern. This valve does not have positive seals on the pilot section and will pass up to 2 in³/min.@1000 psi (32 cc/min.@70 bar ) between port 2 and port 3. This is a consideration in master-slave circuits and in the leak testing of valve-cylinder assemblies. All 3-port counterbalance, load control, and pilot-to-open check cartridges are physically interchangeable (i.e. same flow path, same cavity for a given frame size). Stainless steel cartridge options P or W are intended for use within corrosive environments with all external components manufactured in stainless steel or titanium. Internal working components remain the same as the standard valves. Incorporates the Sun floating style construction tominimize the possibility of internal parts binding due to excessive installation torque and/or cavity/cartridge machining variations. Technical Data U.S. Units Metric UnitsModel Weight 0.34 lb. 0.15 kg.Cavity T-11ACapacity 15 gpm 60 L/min.Pilot Ratio 3:1 Maximum Recommended Load Pressure at Maximum Setting 3075 psi 215 barMaximum Setting 4000 psi 280 barAdjustment - Number of Counterclockwise Turns to Increase Setting3.75 Factory Pressure Settings Established at 2 in³/min. 30 cc/min.Maximum Valve Leakage at Reseat 5 drops/min. 0,4 cc/min.Series (from Cavity) Series 1Reseat >85% of Set Pressure Valve Hex Size 7/8 in. 22,2 mmValve Installation Torque 30 - 35 lbf ft 45 - 50 NmAdjustment Screw Hex Socket Size 5/32 in. 4 mmAdjustment Nut Hex Size 9/16 in. 15 mmAdjustment Nut Torque 108 lbf in. 12 NmSeal Kits Buna: 990-011-007 Seal Kits Viton: 990-011-006 CBCA-LIN Control Functional Setting Range External Material/Seal MaterialLStandard Screw Adjustment +0.00 I400 - 1500 psi w/25 psi Check (30 - 105 bar w/1,7 bar Check), 1000 psi (70 bar) Standard Setting+0.00 N Buna-N +0.00If the material/seal is P, the control must be L or CIf the material/seal is W, the control must be L or C* Special Setting required, specify at time of order Customer specified setting stamped on hex $1.10Related Models CBCAX Explanation of Sun cartridge control options - US units. Explanation of Sun cartridge control options - metric units. Copyright © 2007-2008 Sun Hydraulics Corporation. All rights