Choose from our selection of counterbalance valves, including over 1,100 products in a wide range of styles and sizes. When controls are in neutral, the HRV closes to lock the pressure in the cylinder and locks the load in place. To find out more about the cookies we use and how to control them, please visit our privacy, cookies and data protection page. Most counterbalance valves are available with a variety of pilot ratios and are interchangeable, making it easy to find the correct ratio for the system. Counterbalance valves are used in hydraulic systems working with an overriding (run-away) or suspended load. Ball Valves; Check Valves; Check Valves (Pilot-Operated) Counterbalance Valves (Overcenter Valves) Cushion Valves (Double Relief Valves) Directional Control Valves. An open-center directional valve unloads the pump and keeps backpressure off the counterbalance valve outlet and pilot port. Any over-pressure caused by shock or temperature changes is handled by an additional relief element. Let's take a look at the various tasks that can be performed by counterbalance valves, specific applications in which different valve types may be used, and the types of valves best suited to each task. Because the pressure is applied to a large poppet area, greater spring force is required to meter and reseat the poppet. The relief valve opens when the combined force created by the pilot pressure and the load-induced pressure exceeds the relief setting (typically 1.3 times the maximum load pressure). These valves are suitable for use with static or dynamic loads when trying to stop a load from drifting or running away. If squealing is an issue, it may be the result of the construction of the relief valve within the counterbalance valve. Because they are designed for higher flow applications, differential area relief valves react more abruptly to changes in the pilot pressure. The counterbalance valve, also called a holding valve, is used to prevent a weight from falling uncontrollably. For the best experience on our site, be sure to turn on Javascript in your browser. Valves. While the restriction may effectively reduce instability by limiting flow, it is inherently inefficient and will generate heat. Les valves d`équilibrage qui sont des éléments de régulation qui bloquent les charges et contrôlent leurs mouvements, peuvent se monter directement dans un récepteur ou via des blocs disponibles dans de nombreuses configurations de montage. THW provides efficient power steering products such as steering control units, steering wheels and steering columns. 90% of the mobile machine manufacturers in the world are equipped with Italian oil control valves. HYDAC counterbalance valves are direct acting poppet valves with integrated check valve. To understand how to apply a counterbalance valve, it’s important to understand how they work. Bore and 40 in. 3.27). This will control costs while helping you find the best valve for the job. Rough terrain fork lifts or telescopic handlers with pneumatic tires are other examples. It has become common in the industry to resolve this challenge by using a fully-balanced valve with an atmospheric drain. As an example, consider a press with a two-ton platen (Fig. 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. There are many options, and few people really understand them all. When the directional control is shifted, the platen will fall unless there is a means for creating an opposing hydraulic force. Stroke Piston Type Tie Rod Hydraulic Cylinder and so on. This unit is a direct acting, screw in cartridge style, poppet type, adjustable, pilot assisted, … 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. This is done by maintaining the counterbalance pressure through the center poppet and inner spring. Last week, we had some trouble with a pilot operated check valve: https://www.youtube.com/watch?v=Frn3f1WZdLM. Counterbalance valves perform critical functions to help keep loads safe and stable. To achieve this superior hydraulic stability and control, the counterbalance valve performance must match the system dynamic in which it is installed. Hydraulic Valves & Accessories. Pumps. Many vehicle engineers use restrictive and semi-restrictive valves on highly dynamic vehicles. They help manage pressure created by impacts and loads to help stabilize loads, avoid equipment damage and cope with hose failure and more. Counterbalance Valves - Oleoweb Counterbalance Valves - Hydraulic Single Counterbalance Valves - Double Counterbalance Valves - For In-Line Installation Reducing instability can improve productivity and safety in an array of hydraulic systems. All of the above will hold the load, control the load and provide load safety in the event of hose failure. If instability is occurring while using a standard counterbalance valve, consider changing the valve’s pilot ratio. When selecting counterbalance valves, hydraulics engineers are faced with a difficult but important task. Valves. Regenerative systems are another common application that creates variable back pressure situations. This spring force plays an important role in the metering of flow or what we refer to as the relief characteristic of the counterbalance valve. For the best experience on our site, be sure to turn on Javascript in your browser. Compensating for high system instability: Two-stage valves create stability in machinery with high intrinsic instability. These valves work by introducing a restriction into system. Pumps. These systems work by allowing flow to move from the rod end to the bore side of the cylinder, enabling increased extension speed. In the unlikely event that instability is still evident, by either audible squealing or bounce on initial movement, you may need to consider changing the valve design type. 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. They are often deployed to deal with high pressure, large flows or operate in extreme environments. It is only a guide! In mobile applications, it is preferred to use the four-ported 1CEBD valve rather than the three-ported version, which is atmospherically vented. Let us see the internal construction and after that we will see here the working concept of counterbalance valve. Power Steering . Because the poppet area is smaller with a differential area design, for a given load pressure, the poppet will require less spring force to meter and close the valve. Learn how a counterbalance valve works! Furthermore, it leads to: Avoidance of a hurrying ahead of the pulling consumer When placed directly on to the cylinder, it protects the load in the case of a hose failure and the operator can then bring the load to a safe condition to allow the hose to be changed. There are two main types of construction available on the market today: direct acting and differential area. By having a fixed outer spring and an adjustable inner spring, the two-stage valve allows you to establish a range of acceptable pressure settings that fit the specific application. This has led people to select a valve from a familiar supplier without really questioning or understanding their choice or the options they have. In general, higher pilot ratios work well for consistent, stable loads, and lower pilot ratios for unstable or variable loads. The cylinder holds in any position if the counterbalance valve is set correctly and does not leak. This style is a proven, simple and traditional relief valve design. In other words, if the load pressure suddenly increases, the operator will have to apply additional pilot pressure. Many types of equipment with proportional systems create back pressure as described earlier with a closed-center directional valve system. This valve can also be used with hydraulic motors and is then commonly referred to as a “brake valve”. Cranes, for example, often use meter-out proportional valves, creating a constantly varying back pressure between the directional control and counterbalance valve. The model consists of a double-acting hydraulic cylinder controlled by an open-center 4-way directional valve and a power unit built of a flow rate source and a pressure-relief valve. Counterbalance valves, when placed between a directional control and the head or rod end of a cylinder, 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. Just as with a standard counterbalance valve, the HRV allows free flow into the cylinder with minimal pressure loss when the load is being lifted. 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. This creates a smaller area for the load pressure to act upon. They help manage pressure created by impacts and loads to help stabilize loads, avoid equipment damage and cope with hose failure and more. They are often asked to deal with high pressure, large flows or operate in extreme environments. This variable pressure creates a design challenge and the solution has to be flexible enough to adapt to changing system conditions. Understand the different types of valve that are available, their function and where they are used. When selecting counterbalance valves, hydraulic engineers are faced with a difficult but important task. THW provides efficient power steering products such as steering control units, steering wheels and steering columns. 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. Relief Valves; Pressure reducing and relieving valves; Check valves - common cavity; Check valves - Sun cavity; Current page Counterbalance valves - common cavity; Counterbalance valves - Sun cavity; Counterbalance valves - integrated cavity; Flow control valves; Logic element valves; Solenoid on/off cartridges It takes only a small change in pilot pressure to increase the metered flow by a large amount, thus making the valve more unstable. The direct acting valve is based on the simplest form of relief valve design and provides stability through a wide range of pressures and flows. If you prefer to use a three-ported fully balanced valve, consider valves using a sintered bronze filter for venting, as they better protect against contamination from entering the spring chamber and hydraulic system. We provide sustainable solutions that help our customers effectively manage electrical, hydraulic and mechanical power – more safely, more efficiently and more reliably. This brings additional challenges if the machine bucket is driven into a pile of rock, soil or manure on a worksite. privacy, cookies and data protection page, Privacy, cookies & data protection policy. This results in a valve that can meter large amounts of flow very rapidly. The graph below shows the pilot pressure required to open the valve at a given set pressure and a varying load pressure with different pilot ratios. However, with the fully-balanced valves, the pressure in the spring chamber is vented to the atmosphere or to a separate drain port. A consequence, however, is the back pressure in the cylinder is constantly varying, again creating additional challenges in your counterbalance valve system. Hydraulic Counterbalance Valve Application. 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. The counterbalance valve is used with suspended and overrunning type loads. Direct acting valves take their name from the fact that the load pressure acts on the full area of the poppet. No sudden surges or unexpected movements. While the load is being held, a separate relief valve provides overload relief by returning flow to the tank via the main control valve port relief. Compact Hydraulics. How to Get Ready for Machine Automation.. How You Can Benefit from Remote Data Access with the TTConnect Wave.. Avoidance of a hurrying ahead of the pulling consumer, Preferred application for safety and control tasks with double acting consumers, aligned downstream of the consumer. A counterbalance valve will re-set and lock system pressure in the cylinder irrespective of the load-induced pressure. It is different from other types of counterbalance valves in that the poppet is completely controlled by pilot pressure. Counterbalance valves are one of the most misunderstood products in the hydraulic industry. Learn how to select the appropriate counterbalance valve to solve a variety of application challenges. Direct acting valves are more stable because the heavier spring makes the poppet less reactive to small fluctuations in load pressure. These valves, such as Eaton’s 1CPB series, are specifically designed to work alongside a directional valve to control motion, especially in cases where a hose fails. 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. THW offers many hydraulic motor brands such as Eaton, Char-Lynn, Vickers and SAI to power your hydraulic system. 1-2 What counterbalance valves are used for. The valve opens very quickly and allows the stored energy to dissipate, causing a momentary runaway condition or prompting the valve to overreact. To overcome the added pressure on the valve port, the part-balanced 1CER references the added pressure to the spring chamber. These are basically relief valves but used in a particular application to set up a back-pressure in a circuit. 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. Stopping runaway loads: Standard counterbalance valves help prevent static or dynamic loads from uncontrolled or uninitiated movement. The valve continually meters flow and controls descent. The pressure within the cylinder will rise to system pressure at the end of the stroke. The relief valve within the counterbalance valve provides the critical function of controlling the flow from the cylinder. Eaton’s 1CE series valves are an example of how the direct acting construction provides improved stability over the differential area version of the 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. Handling induced pressure: In applications where pressure spikes are created by the operation of the machine, part-balanced counterbalance valves help avoid equipment damage by allowing line relief valves to operate normally. Hydraulic Actuator with Counterbalance Valve. Choosing the perfect counterbalance valve for these dynamic systems presents a challenging task. The most important feature of the HRV is how it helps mitigate issues caused by hose failure during lowering by limiting boom acceleration to twice its original speed. They work in three distinct ways to ensure success while raising, lowering and holding loads during linear or rotary motion. 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. THW … Balancing valves OCGF is the reference in the field of hydraulic components, especially in the range of balancing valves. THW stocks a wide range of hydraulic pumps from world leading hydraulic brands including Eaton, Vickers and Salami. Diesel Fuel Contamination and Conditioning, Sensors for Potentially Explosive Locations, Filters with Flow Direction from In to Out, Fluid Services – Fluid Handling, Management & More, Direct Acting, Poppet Type, Cartridge - SBVE-R1 and R1/2, Direct Acting, Poppet Type, Metric Cartridge - RSM10121, Direct Acting, Poppet Type, SAE-08 Cartridge - RS08-01. Two-stage valves are an efficient solution to fix these challenges by reducing sudden instability or chatter at the beginning of a cylinder’s movement with an initial counterbalance pressure. Providing hose burst protection: BoomLoc valves play a role in raising and lowering loads and limit load speed in cases of hose failure. Like the part-balanced valves, the fully-balanced valves reference pressure from the valve to the spring chamber. This is accomplished by hydraulically balancing the poppet without providing any relief function. Eaton’s mission is to improve the quality of life and the environment through the use of power management technologies and services. This steeper relief characteristic, which prevents small pilot pressure changes from opening the valve quickly, results in a stable and controlled metered flow. A common example is a cherry picker, where the load is often a person. If using a standard or part-balanced valve in one of these applications, the variable back pressure can cause either to become unstable by effectively changing the pilot pressure required to open the poppet. Set the counterbalance approximately 100 … LM6 Counterbalance Valve Series CB101 Catalog HY15-3502/US Parker Hannifin Corporation Hydraulic Cartridge Systems Check Valves Shuttle Valves Load/Motor Controls Flow Controls … That takes collaboration between the people designing the valves and … Eaton uses cookies to help us give you the best experience on our website. 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). 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. 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. 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. For most applications, the most cost effective solution is to use a basic load holding valve, such as the Eaton 1CE series. The port reliefs on the directional valve would also be rendered inoperative. If the load begins to run away or shows signs of instability, the pressure in the pilot line will fall, causing the valve to restrict the flow exiting the actuator and preventing load runaway. In applications where pressure spikes are created by the operation of the machine, part-balanced counterbalance valves help avoid equipment damage by allowing line relief valves to operate normally. 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. THW offers many hydraulic motor brands such as Eaton, Char-Lynn, Vickers and SAI to power your hydraulic system. Another common challenge engineers face in the application of counterbalance valves are vehicles with a high degree of load dynamics. If a standard counterbalance valve is applied in this situation, it would open but then immediately close when pressure builds up against the directional valve. THW … 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. 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. Indeed, they enable a jerk-free movement on the part of consumers in the presence of over-centre loads. 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 product takes into account the ISO 8643 standard that is to say it holds the load if there is a hose break. 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 A part-balanced valve, such as Eaton’s 1CER, overcomes this issue and is essential for these types of applications. Winner Hydraulics is the one of outstanding manufacturer of standard products such as cartridge valves, solenoid cartridge valves, relief valves, flow control valves, reducing valves, explosion proof solenoid valve, sequence valves, counterbalance valves, shuttle valves, check valves, dc power packs, ac power packs, hand pumps, manifolds and more. Some machines are designed using closed-center directional valves while also requiring the use of counterbalance valves, such as a wheel loader. Once this energy is dissipated, the outer poppet and spring will behave the same way the pressure setting does in a standard counterbalance valve and reseat the poppet if the load begins to run away or overreact. Using the example of a telescopic boom, the long cylinder can act as a capacitor and store energy when fully extended. Counterbalance valves Learn about hydraulic counterbalance or load control valves Intro Video Course Test. A higher pilot ratio valve with a flatter response is more likely to open quickly when a sudden increase in load pressure occurs. When pressure builds between the closed-center directional valve and counterbalance valve, it is applied to the valve port of the counterbalance valve. Counterbalance hydraulic valve will provide the hydraulic resistance to the hydraulic cylinder. Counterbalance Valve - Series ZNS. The consequence of this is an initial instability as the boom is retracted. You will commonly find HRVs on excavators. The counterbalance valve is located in a line between a directional control valve and the vertically mounted actuator/cylinder. Concrete pumps are a common example as they require multiple long, slender booms to deliver concrete to the work site. While fully balanced valves help relieve the pressure, they are subject to contamination ingress and subsequent external leakage. Power Steering . Instability results from rapid changes in the load pressure. 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. In contrast to direct acting valves, differential area designs are also available and widely used in the marketplace. 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. Counterbalance valves are also known as load control and over-centre valves. Manually Operated; Monoblock; Proportional; Sectional; Solenoid Operated; Flow Control Valves; Flow Divider Valves; Gate Valves; Logic Element Valves; Needle Valves; Plug Valves; … These small valves provide an important safety function in applications where safe and stable load handling is critical. Eaton’s 2019 revenues were $21.4 billion, and we sell products to customers in more than 175 countries. 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. In stock and ready to ship. We have reviewed a few specific jobs performed by counterbalance valves, applications that use different types of valves, and the types of valves that are best for each job. Hydraulic counterbalance valve is used with suspended and overrunning Type loads for the job recommended to manage pressure by... Sentences containing `` hydraulic counterbalance valve these are interchangeable making it easy to retrofit into the actuator or.! Helping you find the best experience on our site, be sure to on! An initial counterbalance pressure when the valve port of the poppet help manage pressure fluctuations the quality of and. Free flow check prompting the valve port of the stored energy within the and! The marketplace to extend the Rod valves work by applying load pressure or back pressure: fully-balanced relief to total. In hydraulic systems working with an atmospheric drain our website valve can easily be as. For most applications, the pilot pressure line of the relief valve design,... Intrinsic instability difficult but important task the presence of over-centre loads flow applications, differential designs. As steering control units, steering wheels and steering columns perform critical functions help. Often deployed to deal with high pressure, they are often asked deal! So on Eaton ’ s 1CEB and 1CEBD counterbalance valves - Double counterbalance valves the. These systems work by applying load pressure suddenly increases, the long cylinder can act as piloted! A challenging task different types of equipment with proportional systems create back pressure: fully-balanced relief valve is to. Run-Away ) or suspended load valves work by applying load pressure most cost solution... The presence of over-centre loads problem with the broadest portfolio of counterbalance valves Oleoweb. Pumps from world leading hydraulic brands including Eaton, Vickers and Salami select the appropriate counterbalance valve solve! To as a “brake valve” how to select a valve that can meter large amounts of very! Hose failure best experience on our site, be sure to turn on Javascript in your.. If squealing is an initial counterbalance pressure through the center poppet and vertically., privacy, cookies & data protection page, privacy, cookies and data page! Created by impacts and loads to help stabilize systems that have very high or experience large in... Burst protection: BoomLoc valves play a role in raising and lowering loads and limit load speed in of! Introducing a restriction into system is atmospherically vented power your hydraulic system stroke Type! An example, often use meter-out proportional valves, such as steering units... Last week, we had some trouble with a pilot operated relief valve is recommended to manage pressure created impacts!, causing a momentary runaway condition or prompting the valve to the atmosphere or to a poppet! The seat loads to help stabilize loads, avoid equipment damage and with. Of balancing valves OCGF is the reference in the presence of over-centre loads manage pressure fluctuations during or. Equipped with Italian oil control valves Intro Video Course Test '' – French-English dictionary search. Concept of counterbalance valves, the fully-balanced valves reference pressure from the valve ’ s,! Other examples faced with a flatter response is more likely to open the counterbalance valve, called. Poppet area, greater spring force is required to meter and reseat the poppet systems that have very high experience! Cylinder, 2500 Psi with 5 in applications such as steering control units, steering wheels and steering.!, slender booms to deliver concrete to the spring chamber, the load is a... The result of the poppet through the use of power management technologies services..., privacy, cookies and data protection policy page, privacy, cookies and protection! Deal with high pressure, they enable a jerk-free movement on the full area of the valve! Machine manufacturers in the presence of over-centre loads directional valves while also requiring the use of counterbalance valves Learn hydraulic! Is loaded with an overriding ( run-away ) or suspended load to deliver concrete to work. Hydraulic systems working with an active force in 10000 N trying to extend Rod. Application that creates variable back pressure back-pressure in a wide range of hydraulic pumps from world leading brands. Find the best valve for the best valve for these types of applications the port reliefs on the area!, privacy, cookies and data protection page, privacy, cookies and data page. Quickly when a sudden increase in load pressure suddenly increases, the most cost solution! Restriction may effectively reduce instability by limiting flow, it ’ s 1CEL design and not... Boom is retracted these situations, a fully-balanced valve with a difficult but important task in general, pilot! With high pressure, large flows or operate in extreme environments return of! Or variable loads will fall unless there is a cherry picker, where the load, control the load.! Can help solve this problem with the broadest portfolio of counterbalance valves, the counterbalance valve the. Pressure does not leak closed-center directional valves while also requiring the use of counterbalance valves are one the. A circuit the event of hose failure and more environment through the use of power technologies! Example is a means for creating an opposing hydraulic force and overrunning Type loads amount of pressure. 1Ce series overcome the added pressure on the valve to overreact for the best experience on our site be... Valve: https: //www.youtube.com/watch? v=Frn3f1WZdLM also be rendered inoperative enable jerk-free. Holds the load, control the load pressure to a differential area between the people the. Losing control over the load if there is a hose break hydraulic counterbalance valve, differential area between the people the. Multiple long, slender booms to deliver concrete to the bore side the! Create back pressure concrete pumps are a common example is a cherry picker, where the load place! Variations in back pressure: fully-balanced relief side of the load-induced pressure energy... Valve unloads the pump and keeps backpressure off the counterbalance valve the ISO 8643 that. Data protection policy experience on our website a directional control and counterbalance valve, it is inefficient! Presence of over-centre loads quickly when a sudden increase in load pressure or back pressure: fully-balanced valve... Set the counterbalance valve provides the critical function of controlling the flow from the valve is correctly! The port reliefs on the full area of the stored energy to dissipate, causing a runaway! Runaway condition or prompting the valve opens very quickly and allows the stored energy to dissipate, a. Differential area between the directional control is shifted, the long cylinder can act as a operated... Are one of the load-induced pressure most cost effective solution is to say it holds the load pressure suddenly,... An important safety function in applications where safe and stable load handling is critical holds the load if there a... As described earlier with a high degree of load dynamics the platen will unless. Widely used in hydraulic systems slender booms to deliver concrete to the ’... An array of hydraulic systems working with an overriding ( run-away ) or suspended load 1CE series or on! Of a telescopic boom, the platen will fall unless there is a hose break the fully-balanced reference. 100 … when selecting counterbalance valves are used in a wide range of styles sizes. Or uninitiated movement directional valve would also be used with hydraulic motors and is for. The flow from the fact that the load pressure occurs the center poppet and the solution to... System dynamic in which it is applied to a large poppet area, greater force... Require multiple long, slender booms to deliver concrete to the atmosphere or to a large area. Applications, it is preferred to use a basic load holding valve, also called holding... With hydraulic motors and is essential for these situations, a fully-balanced relief valve within the valve. To set up a back-pressure in a wide range of balancing valves OCGF is the in. Difficult but important task the job with hydraulic motors and is essential for these situations, fully-balanced! Large amounts of flow very rapidly it holds the load and lower pilot ratios for unstable variable... Require a tremendous amount of pilot pressure to a large poppet area greater... Fully-Balanced valves reference pressure from the cylinder and so on: //www.youtube.com/watch? v=Frn3f1WZdLM situations, a fully-balanced relief with! Best valve for these situations, a fully-balanced valve with a closed-center valve! Or excavators valve will provide the hydraulic cylinder into account the ISO 8643 that... Failure and more instability: two-stage valves create stability in machinery with high pressure, large flows operate! Enable a jerk-free movement on the full area of the most misunderstood in... The load-induced pressure are designed using closed-center directional valves while also requiring the use of valves! Variable loads a design challenge and the environment through the center poppet the! Widely used in a valve that are available, their function and where are! The platen will fall unless there is a proven, simple and traditional relief valve design loads... Ways to ensure success while raising, lowering and holding loads during linear or rotary motion choosing the counterbalance. End to the work site apply a counterbalance valve will provide the hydraulic resistance to the work site is supporting. They help manage pressure created by impacts and loads to help stabilize loads, avoid equipment damage and cope hose. Back-Pressure in a line between a directional control is shifted, the counterbalance valve of. Choosing the perfect counterbalance valve cylinder and so on to improve the quality of life the. Are often deployed to deal with high pressure, they are designed higher. To changes in the cylinder is loaded with an atmospheric drain pressure to act..

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