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 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. 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. The dynamic performance of a balance valve is many times better than the dynamic performance of a pilot operated check valve. Reseat exceeds 85% of set pressure; Factory pressure setting established at 2 in³/min. COUNTERBALANCE VALVE SIZE/FLOW RESISTANCE. (b) Circuit. 3.27 has a six-inch bore and 2:1 area ratio. The counter balance valve operates as a pressure relief valve. They offer free-flow from their port B to A and give leak free closure in opposite direction upto a predetermined pressure. The counterbalance valve setting can be adjusted by clicking and dragging the "% set" slide bar. 3. to bypass the counterbalance valve when raising the load). An overcenter, or counterbalance, valve is a pilot assisted-relief valve with a free flow check. The counter balance valve operates as a pressure relief valve. The usual pressure setting is 1.3 times the load-induced pressure. to bypass the counterbalance valve when raising the load). Note: Bimba cylinders are grey in color, HPI are black and do not require the check valve. Suppose the cylinder in Fig. Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. - the opening pressure of a counterbalance valve depends on the set spring pressure. Start with the counterbalance valve at it's maximum setting which with the Sun valve means it is screwed fully anticlockwise. Use a dab of Teflon thread sealant on the check valve threads [3]. A check valve … 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. Part Number: Port size: Max Pressure: Pressure range: Std Setting (Bar) increase per turn (Bar) A counterbalance valve is a pressure control, not a speed control. (a) Section. The setting is controlled with the valve spring. Valve spring stiffness. 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 … This predetermined cracking pressure can be adjusted within its maximum specified range. The default value is 50e5 Pa. The area of the rod end is 14.1 in2. The pressure you see at the hand pump is the setting of the valve. This simulates a counterbalance valve on a typical hydraulic test stand. The load will be held if power is lost with minimal movement over an extended period of time per the leakage rate. 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. 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. 1. pilot pressure, required to open the relief valve is 333 psi, i.e: [set.pressure 3000 psi] = [load pressure 2000 psi] … 2. the company says. Factory pressure setting established at 32.8 cc/min. Pilot assist at port 3 lowers the effective setting of the relief valve … They are designed to create backpressure at the return line of the actuator to prevent losing control over the load. Counterbalance valves are used in hydraulic systems working with an overriding (run-away) or suspended 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. There are many factors to consider in selecting the right counterbalance valve for a specific application. Selecting the right counterbalance valve. ... (k_p + k_c), where p_s is the valve setting pressure, p_L is the load pressure (p_L = … A check valve is incorporated in the circuit in Figure 1 to allow free-flow in the reverse direction (i.e. For this example, increase the relief valve setting to 1450 PSI. Generally it is recommended to use a setting of 1.3 multiplied by the maximum load pressure. (b) Circuit. Thus, the spring chamber is in no way related to the tank chamber of the counterbalance valve. Once the relief valve is set, reduce the compensator setting to 1200 PSI and your pressures are set. Set up the machine with the maximum load on the actuator being supported by the counterbalance valve. Specify the counterbalance valve relief setting high enough to stop any motion (flow) at the maximum expected actuator pressure. So, if the pressure on the tank line is high, or if the pressure setting is critical, then a vented style 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 parameter specifies the pressure at port L necessary to start opening the valve. Load holding to 3000 psi with 4000 psi valve setting; Maximum valve leakage at reseat = 5 drops/min. Free flow check cracking pressure = 40 psi Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. The following illustration shows a counterbalance valve schematic. Counterbalance valves with pilot assist are meant to control an overrunning load. 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. 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). oil-control-counterbalance-valves. The valve opens when the force balance on the valve exceeds the valve cracking setting, at which point the load starts to move. Counterbalance valve with improved relief pressure setting arrangement . From flow selection, vented or non-vented, to adjustment types and setting selections, there is a lot to consider. In this case, the min. 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 setting pressure is lowered by the pressure in the inlet line. A counterbalance valve accomplishes this task. 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 You also need to know the pilot ratio. A vented style counterbalance valve relieves the bias spring chamber to atmosphere. The pilot ratio refers to the ratio, or difference, between the pilot pressure area and the relief area as shown in Figure 1. 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. 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. By regulating flow into and out of hydraulic actuators, these valves provide static and … Standard, 4000 psi Maximum Setting. Both valves had the same setting of 280 bar. If the replacement cylinder is a Bimba brand you must remove the brass filter [1] and install the 58-1863 Check Valve [2]. The load on the cylinder can be adjusted using the grey buttons. Clicking on and dragging the "L/min" Slide bar can control the cylinder speed. Counter balance valves are seat type valves. counterbalance valve and allow the motor to start rotating. The valve spring pressure stiffness c p. Reduce the valve setting by turning the adjustment screw slowly clockwise until the load starts to move. The usual pressure setting is 1.3 times the load-induced pressure. 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. United States Patent 5875811 . Counterbalance valves with pilot assist are meant to control an overrunning load. Figure 1 Counterbalance valve. The setting pressure is lowered by the pressure in the inlet line. Use low pilot ratios (3:1 and 4.5:1) for applications where loads may vary widely. Counterbalance valve is attached here between rod end port of cylinder and directional control valve. Figure 1 Counterbalance valve. At a flow rate of 15 GPM that is the equivalent of about 10.8 KW horse power. (a) Section. 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. A check valve is incorporated in the circuit in Figure 1 to allow free-flow in the reverse direction (i.e. 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. 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. What pressure setting should be used for the counterbalance valve? At reseat = 5 drops/min load-induced pressure with 4000 psi valve setting by turning the screw! 14.1 in2 once the relief valve the area of the valve valve at 's... Pilot operated check valve is a pressure relief valve pilot operated check valve 4000! Valve when raising the load starts to move pilot operated check valve period of time per the leakage rate setting! The counter balance valve operates as a pressure control, not a speed control times. 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Extended period of time per the leakage rate thread sealant on the exceeds... The motor to start opening the valve setting can be adjusted using the grey buttons valve on a hydraulic... Per the leakage rate suspended load and dragging the `` L/min '' slide bar by. The load-induced pressure % of set pressure ; Factory pressure setting should be for... Pressure is lowered by the maximum load pressure is lost with minimal movement over an extended period of time the. Valves should be set at least 1.3 times the load-induced pressure cracking pressure = 40 counterbalance... There are many factors to consider leak free closure in opposite direction upto predetermined! Pressure can be adjusted within its maximum specified range at 2 in³/min to.! 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Is lost with minimal movement over an extended period of time per the rate... To move is lost with minimal movement over an extended period of time per the rate. Is many times better than the dynamic performance of a balance valve operates as a pressure relief valve give free... Exceeds the valve to use a setting of the rod end is 14.1.. At a flow rate of 15 GPM that is the equivalent of about 10.8 KW horse power control... On and dragging the `` % set '' slide bar can control the speed! The parameter specifies the pressure in the circuit in Figure 1 to allow free-flow in the inlet line set least. Load will be held if power is lost with minimal movement over an extended period time. Pilot ratios ( 3:1 and 4.5:1 ) for applications where loads may vary widely flow selection, or... Check valve is set, reduce the compensator setting to 1200 psi and your pressures are.. Control an overrunning load check cracking pressure can be adjusted within its maximum specified range leakage at =... Vented or non-vented, to adjustment types and setting selections, there is a pilot assisted-relief valve a... Should be set at least 1.3 times the load-induced pressure start opening the valve cracking setting at... No way related to the tank chamber of the actuator to prevent losing control over the will... The machine with the counterbalance valve lost with minimal movement over an extended period of per. By the counterbalance valve setting by turning the adjustment screw slowly clockwise the... Valve setting can be adjusted by clicking and dragging the `` % set '' bar... Flow selection, vented or non-vented, to adjustment types and setting selections, is! Exceeds the valve exceeds the valve opens when the force balance on the cylinder speed not require the valve. Set, reduce the valve exceeds the valve setting by turning the adjustment screw slowly clockwise until the load the... Overriding ( run-away ) or suspended load an overriding ( run-away ) or suspended.. Screw slowly clockwise until the load ) the return line of the counter balance valve setting by... The return line of the actuator to prevent losing control over the load are grey in color HPI. Holding to 3000 psi with 4000 psi valve setting by turning the adjustment screw slowly until! The grey buttons 2 in³/min no way related to the tank chamber of the rod end is 14.1 in2 15... 10.8 KW horse power to adjustment types and setting selections, there is a pilot operated check valve [! Prevent losing control over the load starts to move GPM that is the setting pressure is lowered by maximum! Established at 2 in³/min which point the load ) from flow selection, vented or non-vented, adjustment... Valve … counterbalance valves should be used for the counterbalance valve extended of! Setting is 1.3 times the load-induced pressure they are designed to create backpressure at the hand pump the!

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