The valve handles these problems through the use of three cartridges: (a) counterbalance (b) pressure reducing and (c) pilot check. Note: Bimba cylinders are grey in color, HPI are black and do not require the check valve. . First, it is a holding valve. They are designed to create backpressure at the return line of the actuator to prevent losing control over the load. ... Troubleshooting Valve spool scored. Counterbalance valve typically installed in line between directional control valve and a vertically mounted hydraulic cylinder actuator. . The counterbalance valve working principle states that the fluid will be trapped inside the spool under pressure until the pilot pressure overcomes the pre-set value. Valve broken or scored internally. Contact Your Distributor > . This fully-illustrated color manual contains nearly 300 pages of troubleshooting and reliability procedures. The other end connects to the hose outlet [4] on the tank. Hydraulic Schematic Troubleshooting. A separate drain connection from the spring chamber is unnecessary because the pressure section of the valve is inoperative when the T port is pressurized (flow is through the check valve). For example, the control of actuator speeds depends on … 90° Fitting: connection point for the hydraulic hose. If the replacement cylinder is a Bimba brand you must remove the brass filter [1] and install the 58-1863 Check Valve [2]. Counterbalance Valve Application. . The counter balance valve serves several functions. If there is no leak, recharge the nitrogen: Remove the cap [1] from the Shrader valve. . . . The valve must be replaced if a steady flow of fluid is seen coming from the valve … . 8. counterbalance valve is a function of both the load pressure and the pilot pressure, yielding an “inverse pilot ratio”; light loads require more pilot pressure and heavy loads less pilot pressure to open the counterbalance valve, helping to improve stability and providing fine motion control. . When it is counterbalancing the back pressure at T should be kept to a minimum. If a counterbalance valve is used to support a cylinder, the total pressure at the cylinder side of the valve is a sumation pressure required to overcome the spring force plus any pressure drop caused by the flow of oil through the valve. Leave valve ports open and operate the actuator through housing ports (do not exceed OEM's operating pressure). . Locate source of contamination that caused scoring. . . Robert Sheaf. Finally, it prevents the loss of an excess amount of oil in the event of a … . . The built-in check valve prevents the oil from flowing via the pressure adjustment spool to tank. . 1.6) is applied to create a back pressure or cushioning pressure on the underside of a vertically moving piston to prevent the suspended load from free falling because of gravity while it is still being lowered. Turning the adjusting screw clockwise will increase the load carrying capacity of the valve. . … The following illustration shows a counterbalance valve schematic. 5-29 5-7. . . A counterbalance valve is a modulating valve that can maintain an actuator movement at a desired flow rate. . A Excessive Noises 1. valve oscillates and excites the other control elements to oscillation 2. flow noises 3. as 3 A 7 1. valve chatters, due to defective solenoid, or the voltage is too low 2. valve defective due to dirt or wear 3. through flow excessive 4. pilot pressure variations 5. Valve Sticks or Works Hard Tie bolts too tight on valve stacks. . . If used, remove the lifting device from the upright or remove the prop from below the boom, activate the hydraulic system and run the cylinder through one complete cycle to check for leaks. The valve will work the same way on an excavator traveling down hill no matter which way the motor is turning. Once the plumbing was corrected, the motor turned freely and predictably. A counterbalance valve will only open enough to allow the load to move at the desired flow rate, thus preventing the load from over-speeding the pump. The relief valve within the counterbalance valve provides the critical function of controlling the flow from the cylinder. There is low oil level in the counterbalance system. Pressure relief valve, pressure reducing, sequence, unloading and counterbalance valve are different types of pressure control valves. . Counterbalance valve has internal leak: Disconnect hydraulic lines and bypass valve. Secondly, it is designed to control the speed at which the lowering function operates, and allows that motion to be metered under load. Use manufacturer™s recommendation to adjust tie bolt torque. The Ten Step Troubleshooting Process is taught with the goal of eliminating the "hit or miss" methods that can be so costly in terms of time and materials. . Troubleshooting Guide MAINTENANCE AND TROUBLESHOOTING * Replacement parts may be needed. Use the bottom valve. . A counterbalance valve will re-set and lock system pressure in the cylinder irrespective of the load-induced pressure. With the pump functioning normally, the external solenoid valve is closed to ensure that the load is not lowered due to the pilot supply oil flow requirement of approximately 1 l/min [0.26 US gal/min]. In addition, fluid flow rate must be controlled in various lines of a hydraulic circuit. Try your luck with this month's reader challenge. Use a dab of Teflon thread sealant on the check valve threads [3]. C-Series Operator Manual 7-5 Chapter 7: Hydraulic System Troubleshooting Check for and remove any obstruction in return line. The load will not “run away” due to the effects of external forces, such as gravity. . 7. . . Free Knowledge For All. Repair broken or scored parts. The incorrectly plumbed counterbalance valve failed to open, thus preventing any flow from getting to the motor. Thus preventing air from passing past the rod seals and into the cylinders. Note: If your system has a double-ended tank system, a second Schrader valve is at the top of the tank(s). Repair or replace valve. It was found 2 out of 4 throttle was partially open, it was mistake of the painter who partially kept open the valve for his convenient while painting. FM 5-499 v Page 5-6. The counterbalance valve shown has an integral check valve. Generally what I've worked on for counterbalance valves work on both sides of a circuit. A counterbalance valve opens a free flow in one direction while regulating the opposite flow until a certain pressure is reached. Basic Hydraulic Troubleshooting is written for electricians, millwrights, supervisors, reliability technicians and anyone who is responsible for the hydraulic maintenance of plant machinery. . Downloads from ROSS Controls. 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