It can also be used . Try your luck with this month's reader challenge. First, it is a holding valve. Valve Assembly. … The reservoir also maintained a much lower temperature because oil was not being forced through an unnecessary restriction created by the partially shifted spool. . 7. New counterbalance valve was fixed. 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. . . . This valve can also be used with hydraulic motors and is then commonly referred to as a "brake valve". . 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]. The built-in check valve prevents the oil from flowing via the pressure adjustment spool to tank. 8. Repair or replace valve. Once the plumbing was corrected, the motor turned freely and predictably. The load will not “run away” due to the effects of external forces, such as gravity. FM 5-499 v Page 5-6. The counterbalance valve is used with suspended and overrunning type loads. . . 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). The valve must be replaced if a steady flow of fluid is seen coming from the valve … The name counterbalance came from the counterbalancing weights used in the earlier machine tools to prevent the ball screw from coming under heavy load. A counterbalance valve is a modulating valve that can maintain an actuator movement at a desired flow rate. The valve handles these problems through the use of three cartridges: (a) counterbalance (b) pressure reducing and (c) pilot check. . Optional manual and flush manual release. Repair broken or scored parts. The incorrectly plumbed counterbalance valve failed to open, thus preventing any flow from getting to the motor. 5-29 5-7. Free Knowledge For All. Troubleshooting Challenge: Pressure Poses Problem. . (a) The counterbalance cartridge addresses air ingestion by preventing the implements series cylinders from running ahead of the oil supply. Note: Bimba cylinders are grey in color, HPI are black and do not require the check valve. There is low oil level in the counterbalance system. 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. Problem Possible Cause Solution Shaft rotates slowly or not at all Insufficient torque output Low rate of fluid flow Counterbalance valve has internal leakage Leak in piston and/or shaft seal Corrosion build-up on the thrust surfaces . . When it is counterbalancing the back pressure at T should be kept to a minimum. For more information call 1(800) 438-7677. If there is no leak, recharge the nitrogen: Remove the cap [1] from the Shrader valve. . Valve broken or scored internally. ... Troubleshooting Valve spool scored. . Robert Sheaf. The following illustration shows a counterbalance valve schematic. . This fully-illustrated color manual contains nearly 300 pages of troubleshooting and reliability procedures. Contact Your Distributor > Page 96: Cylinders With Dual Counterbalance Valves 7. C-Series Operator Manual 7-5 Chapter 7: Hydraulic System Troubleshooting Check for and remove any obstruction in return line. 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. Model: Description: Section: AODV: Air Operated Directional Control Valve: 09: BDSV: Ball Type Shuttle Valve: 04: BFCV: Pressure Compensated (Bypass) Flow Control Valve . The other end connects to the hose outlet [4] on the tank. The relief valve opens when the combined force created by the pilot pressure and the load-induced pressure . . . Troubleshooting A Counterbalance Valve . Leave valve ports open and operate the actuator through housing ports (do not exceed OEM's operating pressure). Pressure relief valve, pressure reducing, sequence, unloading and counterbalance valve are different types of pressure control valves. . The counterbalance valve shown has an integral check valve. Connect the Charge / Discharge kit (P/N 35-4050A) [2] to the Shrader valve [3]. . KMW Ltd. 198 N. Hwy 281 Great Bend, Kansas 67530 800 445-7388 Fax 620 793 -6737 ïïïK âãïäç~ÇÉêëKÅçã TROUBLESHOOTING SECTION OPERATORS MANUAL Troubleshooting Guide MAINTENANCE AND TROUBLESHOOTING * Replacement parts may be needed. When the operator begins to lower the load, this stored energy gives the counterbalance valve the message that a heavy load is on the boom, and less pilot pressure is required to open the counterbalance valve. . With your fingers, tighten the gas chuck [1] on the charge/discharge kit to the Schrader valve [2]. Downloads from ROSS Controls. In addition, fluid flow rate must be controlled in various lines of a hydraulic circuit. . Corrective Action: Check for leaks on the top of the cylinder. The valve will work the same way on an excavator traveling down hill no matter which way the motor is turning. Individual product data sheets are available for download on product catalog pages. . . . . 9. . Use manufacturer™s recommendation to adjust tie bolt torque. . . . Schrader Valve: allows you to add or remove pressure. A counterbalance valve opens a free flow in one direction while regulating the opposite flow until a certain pressure is reached. For example, the control of actuator speeds depends on … The counterbalance valve is located in a line between a directional control valve and the vertically mounted actuator/cylinder. Secondly, it is designed to control the speed at which the lowering function operates, and allows that motion to be metered under load. Threaded Rod End: connects to the spindle head bracket. 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. Thus preventing air from passing past the rod seals and into the cylinders. The lifeguard, however, for any hydraulic actuator, is the overcenter valve. Download product catalogs, application white papers, product certifications, installation instructions and manuals. CBF hydraulic produces hydraulic overcenter valves, counterbalance valves, check valves, flow control valves, pressure control valves, relief valves contact us: +39 0444.499.141 email: info@cbfhydraulic.com . Haas Technical Documentation Hydraulic Counterbalance - How it Works and Troubleshooting Guide Scan code to get . 90° Fitting: connection point for the hydraulic hose. A counterbalance valve (Fig. . Note: If your system has a double-ended tank system, a second Schrader valve is at the top of the tank(s). . Basic Hydraulic Troubleshooting is written for electricians, millwrights, supervisors, reliability technicians and anyone who is responsible for the hydraulic maintenance of plant machinery. 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. Hydraulic Schematic Troubleshooting. The counterbalance valve will hold a load in position until pressure or an external force is applied to move the load. What to Talk to Someone? Locate source of contamination that caused scoring. Counterbalance valves are used in hydraulic systems working with an overriding (run-away) or suspended load. They are designed to create backpressure at the return line of the actuator to prevent losing control over the load. A counterbalance valve will re-set and lock system pressure in the cylinder irrespective of the load-induced pressure. The counter balance valve serves several functions. The method I describe for troubleshooting the cylinder and the valve though is as I … . 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 has internal leak: Disconnect hydraulic lines and bypass valve. Use a dab of Teflon thread sealant on the check valve threads [3]. . . . A Haas Factory Outlet (HFO) can answer your questions and walk you through your best options. . 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. After a half troubleshooting on the HPU a sudden spark came in mind to check the throttle valve. This motion controlling marvel is the successor of the counterbalance valve. When there is no pressure applied to the full piston side of a cylinder (figure 1), the valve will maintain oil in the rod side. . Note: Make sure you turn the T-handle of the gas chuck fully counterclockwise. . 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. . Finally, it prevents the loss of an excess amount of oil in the event of a … A counterbalance valve can easily be described as a pilot operated relief valve with a free flow check. 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. counterbalance valve. Counterbalance valve act as a hydraulic restrictor to hydraulic cylinder. . Counterbalance Valve Application. . . Valve Sticks or Works Hard Tie bolts too tight on valve stacks. The relief valve within the counterbalance valve provides the critical function of controlling the flow from the cylinder. 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. . Use the bottom valve. Turning the adjusting screw clockwise will increase the load carrying capacity of the valve. Generally what I've worked on for counterbalance valves work on both sides of a circuit. System analysis and troubleshooting skills are taught using the circuits and schematics on a coiled tubing unit. . Counterbalance valve typically installed in line between directional control valve and a vertically mounted hydraulic cylinder actuator. Safety is stressed along with sound maintenance practices. 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