Counterbalance Valve - Series ZNS. A more efficient alternative to restrictive valves is a two-stage valve, such as Eaton’s 1CEL design. These small valves provide an important safety function in applications where safe and stable load handling is critical. Counterbalance Valve | Operation Principle of Counterbalance Valve Counterbalance valve is setup to creates a back-pressure to prevent the load running away when the cylinder is retracting. The additional port can be drained to tank, thus preventing contamination ingress into the valve, which often causes seal damage and external leakage. Ball Valves; Check Valves; Check Valves (Pilot-Operated) Counterbalance Valves (Overcenter Valves) Cushion Valves (Double Relief Valves) Directional Control Valves. Because they are designed for higher flow applications, differential area relief valves react more abruptly to changes in the pilot pressure. Many people tend to complicate the task of selecting a counterbalance valve and as such avoid opportunities. Not only can pressure be captured between the directional and counterbalance valve, but a high induced pressure will result and the cylinder will need to give in order to prevent mechanical damage. SJ TECHNOLOGY is a professional manufacturer of hydraulic control valves with 40LPM-400LPM flow rate, hydraulic gear pumps with G1,G2,G3 series, hydraulic power units, pilot check valve and we design the hydraulic system for your machinery too. Providing hose burst protection: BoomLoc valves play a role in raising and lowering loads and limit load speed in cases of hose failure. GoTo Hydraulics. Finally, while all counterbalance valves provide a level of hose burst protection when applied correctly, BoomLoc hose rupture valves (HRVs) provide an added level of protection to meet ISO8643 requirements. Many vehicle engineers use restrictive and semi-restrictive valves on highly dynamic vehicles. Bore and 40 in. There are two main types of construction available on the market today: direct acting and differential area. Counterbalance valves are also known as load control and over-centre valves. Valve (2) Hydraulic Oil 150 SSU @ 100°F (32 cSt) Controlled Flow Free Flow 0 50 100 13.8 17.2 10.3 3.5 6.9 200 250 PSI Bar 150 Pressure Dr) Flow (Q) 38 10 0 8 2 15 4 23 6 30 8 LPM GPM 45 12 53 14. Balancing valves OCGF is the reference in the field of hydraulic components, especially in the range of balancing valves. Power Steering . Counterbalance valves can be used with paired cylinders: pilot pressure will open first the valve of the most heavily loaded cylinder; this will cause load transfer to the other cylinder and the related valve, still closed, will require less pilot pressure for opening. This pressure is now acting on both ends of the poppet and becomes balanced or negates the effect of the back pressure on the valve port. Choosing the perfect counterbalance valve for these dynamic systems presents a challenging task. Power Steering . 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. Hydraulic Valves & Accessories. While the restriction may effectively reduce instability by limiting flow, it is inherently inefficient and will generate heat. In the chart above, you can see how a lower pilot ratio valve (2.5 to 1) has greater sensitivity to changes in the load pressure. The proven CB** family of valves leverages a proven poppet-and-piston design suitable for most general applications and provides precise, reliable load holding and motion control at an affordable price. Counterbalance valves play an integral role in the important task of safely controlling an actuator, which may be holding a load or a person in the air. 1-2 What counterbalance valves are used for. Using the example of a telescopic boom, the long cylinder can act as a capacitor and store energy when fully extended. Rough terrain fork lifts or telescopic handlers with pneumatic tires are other examples. Any over-pressure caused by shock or temperature changes is handled by an additional relief element. They are designed to create backpressure at the return line of the actuator to prevent losing control over the load. In each case, Eaton offers options that can help hydraulic engineers tackle design, requirement and cost challenges while providing superior stability and performance for load-holding applications. Bore and 48 in. While this can be beneficial when dealing with very-high-flow applications, it can lead to instability and squealing in typical moderate-flow hydraulic applications. This brings additional challenges if the machine bucket is driven into a pile of rock, soil or manure on a worksite. Compensating for high system instability: Two-stage valves create stability in machinery with high intrinsic instability. They help manage pressure created by impacts and loads to help stabilize loads, avoid equipment damage and cope with hose failure and more. LM6 Counterbalance Valve Series CB101 Catalog HY15-3502/US Parker Hannifin Corporation Hydraulic Cartridge Systems Check Valves Shuttle Valves Load/Motor Controls Flow Controls … You will commonly find HRVs on excavators. A common example is a cherry picker, where the load is often a person. In mobile applications, it is preferred to use the four-ported 1CEBD valve rather than the three-ported version, which is atmospherically vented. The cylinder holds in any position if the counterbalance valve is set correctly and does not leak. The consequence of this is an initial instability as the boom is retracted. For the best experience on our site, be sure to turn on Javascript in your browser. Eaton uses cookies to help us give you the best experience on our website. The BoomLoc valve can be described as a piloted, metered poppet valve with a free flow check. A counterbalance valve can easily be described as a pilot operated relief valve with a free flow check. Hydraulic Cylinder, Cylinders with Integrated Counterbalance Valves, Hydraulic Lift Cylinder for Vehcile manufacturer / supplier in China, offering Hydraulic Cylinders with Integrated Counterbalance Valves, 2500 Psi with 5 in. Understanding Counterbalance Valves | Hydraulics & Pneumatics Counterbalance valve will be used here, between directional control valve and outlet of cylinder, in order to avoid the falling of weight due to gravity. That takes collaboration between the people designing the valves and … Unlike other valves, the load pressure or back pressure does not affect the metering of the poppet. Counterbalance valves play an integral role in the important task of safely controlling an actuator, which may be holding a load or a person in the air. These systems work by allowing flow to move from the rod end to the bore side of the cylinder, enabling increased extension speed. The proven counterbalance valve series ZNS in size NG06 (CETOP 03) and NG10 (CETOP 05) enables a reliable operation by controlling the actuator movement at overrunning loads. It takes only a small change in pilot pressure to increase the metered flow by a large amount, thus making the valve more unstable. To find out more about the cookies we use and how to control them, please visit our privacy, cookies and data protection page. When pressure builds between the closed-center directional valve and counterbalance valve, it is applied to the valve port of the counterbalance valve. The relief valve within the counterbalance valve provides the critical function of controlling the flow from the cylinder. The pilot ratio does not necessarily have a substantial impact on the working pressure, because the normal working pressure for a system is often higher than the pilot pressure required to open the valve fully. Learn how a counterbalance valve works! Indeed, they enable a jerk-free movement on the part of consumers in the presence of over-centre loads. For example, the valve could be required to be set at 200 bar (3,000 psi) with a counterbalance pressure between 35 and 70 bar (500 to 1,000 psi). The two-stage valve maintains an initial counterbalance pressure when the valve is opened to prevent total decay of the stored energy within the cylinder. 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