the company says. Valve spring stiffness. When the cylinder is moved at high speed with no outer force against the counterbalance valve with 280 bar setting, an inlet pressure of 1575 psi is required. Thus, the spring chamber is in no way related to the tank chamber of the counterbalance valve. The valve spring pressure stiffness c p. To hold the load, the counterbalance valve must be set to 1.3 * 10000/ 5e-3 = 26e5 Pa, where 1.3 is the safety coefficient, 10000 N is the load, 5e-5 m^2 is the effective piston area in the rod chamber. - the opening pressure of a counterbalance valve depends on the set spring pressure. The load on the cylinder can be adjusted using the grey buttons. Counterbalance valves with pilot assist are meant to control an overrunning load. Figure 1 Counterbalance valve. Free flow check cracking pressure = 40 psi Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. Truck Mixers Single Overcentre Counter Balance Valve Ask Price We are highly appreciated by the clients for offering a superior quality range of Truck Mixers Single Overcentre Counter Balance Valve. pilot pressure, required to open the relief valve is 333 psi, i.e: [set.pressure 3000 psi] = [load pressure 2000 psi] … Product Description: Counterbalance Valve 3:1 Pilot Ratio Adjustable Range: 1000-4000 PSI Standard Setting: 3000 PSI 25 PSI Check Rated Flow: 30 GPM Cavity: T-2A Replaces Sun CBEA-LHN, CBEALHN, CB-2A-33-H-L, CB2A-33HL Manufacturer: Winner Hydraulics Certifications: IP65, ISO9001, CE, RoHS 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. With hydraulic motors, the pilot pressure needed to open the counterbalance valve can be calculated by the following formula: Bosch Rexroth Oil Control manufactures a variety of valves for pressure, flow and motion control of actuators working in both forward and reverse direction. to bypass the counterbalance valve when raising the load). ... (k_p + k_c), where p_s is the valve setting pressure, p_L is the load pressure (p_L = … Generally it is recommended to use a setting of 1.3 multiplied by the maximum load pressure. 2. Standard, 4000 psi Maximum Setting. The usual pressure setting is 1.3 times the load-induced pressure. The two-stage valve has overcome many instability problems by preventing the total decay of the stored energy in the cylinder and stopping the valve overreacting. Counterbalance valve with improved relief pressure setting arrangement . Use low pilot ratios (3:1 and 4.5:1) for applications where loads may vary widely. 3. United States Patent 5875811 . Figure 1 Counterbalance valve. Setting Pressure Range Code Pilot Ratio A 3:1 B 4.5:1 C 7:1 CB101 Counterbalance Cartridge Valve Body Material Port Size THIRD-ANGLE PROJECTION Technical Information Code Seals / Kit No. The dynamic performance of a balance valve is many times better than the dynamic performance of a pilot operated check valve. This valve module includes 2 sections, each one composed by a check and a relief valve pilot assisted by pressure in the opposite line: the check section A check valve is incorporated in the circuit in Figure 1 to allow free-flow in the reverse direction (i.e. You also need to know the pilot ratio. On a very few machines, the 250 – 300 PSI spread between the relief valve and the compensator settings will not be enough to overcome the cracking pressure of the relief valve. to bypass the counterbalance valve when raising the load). If you want to know the setting of the motion control valves...they are not counter balance valves, they have a pilot supply to them, then you need to supply pressure to port a or port b. Selecting the right counterbalance valve. It allows the pressure to fall to the counterbalance setting, which can be … Pilot assist at port 3 lowers the effective setting of the relief valve … In this case, the min. oil-control-counterbalance-valves. Counterbalance valves are used in hydraulic systems working with an overriding (run-away) or suspended load. At a flow rate of 15 GPM that is the equivalent of about 10.8 KW horse power. As shown in Figure 1, a counterbalance valve attached to the full-bore (cap end) area of the cylinder and set to 150 bar, at zero load, will force the pump to develop a pressure of 300 bar at the annular (rod end) area before the cylinder is allowed to move (if the annular area is half the full bore). 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