(a) Section. - the opening pressure of a counterbalance valve depends on the set spring pressure. From flow selection, vented or non-vented, to adjustment types and setting selections, there is a lot to consider. Dual counterbalance It provides static and dynamic control of load by regulating the flow IN and OUT of the actuator, through ports C1 and C2. Selecting the right counterbalance valve. There are many factors to consider in selecting the right counterbalance valve for a specific application. 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. A check valve is incorporated in the circuit in Figure 1 to allow free-flow in the reverse direction (i.e. Counterbalance valves with pilot assist are meant to control an overrunning load. A counterbalance valve accomplishes this task. Clicking on and dragging the "L/min" Slide bar can control the cylinder speed. Counterbalance valve is attached here between rod end port of cylinder and directional control valve. This simulates a counterbalance valve on a typical hydraulic test stand. 3. Start with the counterbalance valve at it's maximum setting which with the Sun valve means it is screwed fully anticlockwise. Both valves had the same setting of 280 bar. oil-control-counterbalance-valves. The pilot ratio refers to the ratio, or difference, between the pilot pressure area and the relief area as shown in Figure 1. Factory pressure setting established at 32.8 cc/min. 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). In this case, the min. Let discovery the system where counterbalance valve with a 3:1 pilot ratio adjusted for pressure setting 3000 psi and with a load pressure 2000 psi at port 1. Use a dab of Teflon thread sealant on the check valve threads [3]. 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. 1. What pressure setting should be used for the counterbalance valve? 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. Generally it is recommended to use a setting of 1.3 multiplied by the maximum load pressure. Load holding to 3000 psi with 4000 psi valve setting; Maximum valve leakage at reseat = 5 drops/min. 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 Reseat exceeds 85% of set pressure; Factory pressure setting established at 2 in³/min. the company says. 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. A vented style counterbalance valve relieves the bias spring chamber to atmosphere. counterbalance valve and allow the motor to start rotating. Fixed-setting, 3-port Counter Balance Valves with pilot assist function similarly to the adjustable versions except the fixed setting is pre-set to a nominal value. The valve spring pressure stiffness c p. The usual pressure setting is 1.3 times the 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. 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. A check valve is incorporated in the circuit in Figure 1 to allow free-flow in the reverse direction (i.e. Once the relief valve is set, reduce the compensator setting to 1200 PSI and your pressures are set. Pilot assist at port 3 lowers the effective setting of the relief valve … pilot pressure, required to open the relief valve is 333 psi, i.e: [set.pressure 3000 psi] = [load pressure 2000 psi] … They are designed to create backpressure at the return line of the actuator to prevent losing control over the load. 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. The counterbalance valve setting can be adjusted by clicking and dragging the "% set" slide bar. During lowering of the weight or extension of cylinder, hydraulic oil leaving the cylinder will enter to the primary port of counterbalance valve i.e. (b) Circuit. Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. Counterbalance valves with pilot assist are meant to control an overrunning load. At a flow rate of 15 GPM that is the equivalent of about 10.8 KW horse power. An overcenter, or counterbalance, valve is a pilot assisted-relief valve with a free flow check. The load will be held if power is lost with minimal movement over an extended period of time per the leakage rate. A check valve … They offer free-flow from their port B to A and give leak free closure in opposite direction upto a predetermined pressure. Figure 1 Counterbalance valve. The counter balance valve operates as a pressure relief valve. 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. The load on the cylinder can be adjusted using the grey buttons. This predetermined cracking pressure can be adjusted within its maximum specified range. The parameter specifies the pressure at port L necessary to start opening the valve. Part Number: Port size: Max Pressure: Pressure range: Std Setting (Bar) increase per turn (Bar) Counterbalance Valve, Cartridge Series: VCB 0-350 Bar (0-5075 PSI) 0-400 lpm (0-105 gpm ) Features Counterbalance valves for the control or holding of a negative gravitational load. You also need to know the pilot ratio. The area of the rod end is 14.1 in2. Specify the counterbalance valve relief setting high enough to stop any motion (flow) at the maximum expected actuator pressure. (a) Section. The usual pressure setting is 1.3 times the load-induced pressure. The following illustration shows a counterbalance valve schematic. Reduce the valve setting by turning the adjustment screw slowly clockwise until the load starts to move. It allows the pressure to fall to the counterbalance setting, which can be … Suppose the cylinder in Fig. Standard, 4000 psi Maximum Setting. The default value is 50e5 Pa. A counterbalance valve is a pressure control, not a speed control. 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. Free flow check cracking pressure = 40 psi Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. Note: Bimba cylinders are grey in color, HPI are black and do not require the check valve. 2. Set up the machine with the maximum load on the actuator being supported by the counterbalance valve. 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 COUNTERBALANCE VALVE SIZE/FLOW RESISTANCE. The counter balance valve operates as a pressure relief valve. 3.27 has a six-inch bore and 2:1 area ratio. The pressure you see at the hand pump is the setting of the valve. 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. Valve spring stiffness. to bypass the counterbalance valve when raising the load). Pilot assist at port 3 lowers the effective setting of the relief valve … to bypass the counterbalance valve when raising the load). Thus, the spring chamber is in no way related to the tank chamber of the counterbalance valve. Counterbalance valves are used in hydraulic systems working with an overriding (run-away) or suspended load. For this example, increase the relief valve setting to 1450 PSI. 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. (b) Circuit. The setting pressure is lowered by the pressure in the inlet line. So, if the pressure on the tank line is high, or if the pressure setting is critical, then a vented style counterbalance valve … United States Patent 5875811 . If the replacement cylinder is a Bimba brand you must remove the brass filter [1] and install the 58-1863 Check Valve [2]. 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