For example, the shovel assembly can first be used to dig downwardly to excavate the soil where a pipeline is to be laid. They are frequently employed to ‘counterbalance' a load as … However, a hollow poppet housing 37 is retained within the chamber 36. 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). In counterbalance valves, a differential area that controls the relief function is fixed by the manufacturer upon fabricating the cage and poppet and is subject to wide tolerances when diameters of the valve components are large. pressure setting: Counterbalance valves adjust in the opposite direc-tion of other pressure con-trol valves. While counterbalance valves maintain a healthy amount of back pressure, they force the pump to develop the full set pressure on the counterbalance spring before they allow the actuator to move. A counterbalance valve’s function is to maintain a set pressure against the load to keep it from over-running. The tank port T of the holding valve 20 is connected through a line 23 to the tank 11. Privacy Policy Counterbalance valve pilot cracking pressure calculator. This is likely to be about 30% of the load induced pressure but check the valve manufacturer recommendations. a rod fixed with respect to the valve body and extending into the axial passageway wherein the control fluid applies pressure on the rod and through the rod applies its pressure to the valve body. The power line 13 is connected to a first port of a conventional four-way control valve 15. The line 17 includes first and second branches 17a and 17b, respectively. The pressure setting is slightly higher than that required to keep the load from free-falling. pilot pressure, required to open the relief valve is 333 psi, i.e: [set.pressure 3000 psi] = [load pressure 2000 psi] … This is the highest deceleration pressure it can use to stop an actuator. 3 is an elevational view of a portion of the counterbalance valve of FIG. Now, turn the adjust the opposite direction very slowly. Most applications where pressure compensated proportional valves are used involve metering out of the actuator down stream of the counterbalance valve. The pilot pressure controls the amount of poppet opening against the bias of spring 39 during normal operation as in a standard counterbalance valve. 2) The Improvement According to the Present Invention. L oosen the jam nut. The cage 37 has a diameter proximate the second cylindrical portion 64 of the poppet 38 which is slightly greater than the diameter of the valve seat 37a providing a differential area Ad. Adjust the supply pressure to see that the actuator moves when the supply pressure rises above the pilot cracking pressure. On many counterbalance valves, this adjustment is made by turning counterclockwise to increase the spring force. 1. Every attempt has been made to ensure these calculations are accurate. A conventional four-way valve is frequently employed for this purpose. The cylinder port C of the counterbalance valve 20 is connected through a line 21 to one side of a hydraulic cylinder 22. The poppet valve element is urged by a spring into engagement with a valve seat and pilot pressure is applied in opposition to the spring. Hydraulically operated machines are frequently used in construction projects and other activities. The best way to check the setting is to remove the valve from the circuit. 4. 1; and. The holding valve 20 has four ports, namely, a pilot port P, a valve port V, a cylinder port C, and a tank port T. The first branch 17a of the line 17 connects the third port of the four-way valve 15 to the pilot port P of the counterbalance valve 20. 6. They are employed when it is necessary to relief pressure at the pre-established pressure setting (Pt), without over-pressurizing the system, independently from any back-pressure in the return line. If this occurs, the holding valve prevents any hydraulic fluid from flowing in or out of the cylinder chambers, thereby locking the piston within the cylinder and preventing the load from falling. The piston is connected by a rod to the movable member of the machine (i.e., the shovel assembly of a backhoe) for movement therewith. Privacy Policy 2. Other aspects and advantages of this invention will become apparent to those skilled in the art from the following detailed description of the preferred embodiment, when read in light of the accompanying drawings. The rod 74 pushes on the valve body 31 with no effect. A spring 39 is also disposed within the poppet case 37. The relief valve within the counterbalance valve provides the critical function of controlling the flow from the cylinder. FIG. Screw the valve into a … Indeed the valve can be piloted fully open, eliminating the counterbalance pressure altogether and so improving the efficiency of the system. An extended allen-key wrench may be needed because the strong springs in the valve make them difficult to adjust under pressure. 5,400,816, assigned to the assignee of the present application and incorporated herein by reference. Enter the valve set pressure. Full clockwise setting is less than 200 psi (14 bar). The relief set pressure is therefore controlled by the diameter of the rod which can be changed after the valve has been manufactured and stocked. The valve applies a balanced piston design allowing relief operation at the valve setting independent of back-pressure at 2. Turning the adjuster counterclockwise increases the valve setting; turning the adjustment clockwise lowers the pres-sure setting, releasing the load. The cracking pressure is now shown in the calculation. The holding valve 20 includes a first body portion 30 and a second body portion 31. 2 and 3, the structure of the holding valve 20 is illustrated in detail. Before removing any valve, ensure machines and loads are mechanically held in position and that the valve is not under pressure at the time of its removal. If pilot pressure is set too low, the counterbalance valve may quickly open too far — allowing the cylinder to run away and pilot pressure to drop. A radial bore in 76 in the first cylindrical portion 62 intersects the axial bore so that the axial bore 72 is connected to the annular chamber 68 in the cage 37. In order to achieve repeatable, consistent operation of a counterbalance valve, a poppet valve element within the valve has a radial bore therein in communication with a control fluid port and an axial bore therein which receives a rod that is anchored to a poppet valve cage that surrounds the poppet valve element. A counterbalancing valve, indicated generally at 20, is provided in the system 10. By changing the diameter of the rod and axial bore through the poppet valve element which receives the rod, the relief set pressure can easily be changed. Referring now to the drawings, there is illustrated in FIG. The spring chamber is drained to 2, and any back-pressure at 2 is additive to the pressure setting in all functions. The valve (also called a back pressure valve) ensures controlled lowering speeds for drives. The axial bore 72 receives a rod 74 which is fixed to the valve body housing 30 and extends through the cage 37. The line 18 connects the fourth port of the four-way valve 15 to the valve port V of the counterbalance valve 20. Counterbalance valve stops flow from its inlet port to its outlet port until pressu… From the foregoing description, one skilled in the art can easily ascertain the essential characteristics of this invention, and without departing from the spirit and scope thereof, can make various changes and modifications of the invention to adapt it to various usages and conditions. In the counterbalance mode, the pilot pressure in chamber 41 acts all of the time against the bias of spring 39 only and not against the controlled pressure, thus providing repeatable, consistent operation regardless of the controlled pressure. The rod 26 is connected to a movable member, such as the lifting arm of a crane or man basket or the shovel assembly of a backhoe or similar machine, and extends outwardly from the cylinder 22. They are designed to create backpressure at the return line of the actuator to prevent losing control over the load. In many cases the maximum load … 3. The cylinder runs away when the … In most hydraulically operated machines which perform lifting functions, a holding or counterbalance valve is connected in the hydraulic lines extending between the four-way valve and the cylinder, typically directly adjacent to the cylinder. As is well known in the art, the four-way valve 15 is selectively moved so as to cause the piston 25 to move relative to the cylinder 22, thereby moving the member connected to the rod 26. At this point, the counterbalance valve shuts abruptly and the cylinder stops. By virtue of this arrangement, control fluid pressure is applied via the rod directly to the valve body in which the poppet valve element and cage are mounted. An orifice plug 47 is disposed in the passageway 45 between the pilot port P and the chamber 46. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT. The pilot pressure at Z, required to open the valve in case of an unloaded cylinder depends on the valve pilot ratio R and the pressure setting of the spring. - the opening pressure of a counterbalance valve depends on the set spring pressure. When the poppet 38 engages the seat 37a under the urging of the spring 39, fluid communication is prevented between the chamber 36 and the chamber 32. Next, very slowly turn the adjustment in the … a primary check valve assembly for permitting fluid to flow in a first direction from the valve port to the cylinder port of the counterbalancing valve assembly; a poppet valve assembly for permitting fluid to flow in a second direction from the cylinder port to the valve port of the holding valve assembly, said poppet valve assembly being biased by a spring to a closed position for preventing fluid from flowing therethrough, an open position for permitting fluid to flow therethrough, and intermediate positions for modulating the rate at which fluid flows therethrough, the selection of which being determined by pilot fluid pressure communicated through a first passage in the counterbalance valve assembly from the valve pilot port to said poppet valve assembly; and. The unbalanced pressure in the annular chamber 68 therefore pushes the poppet 38 against the bias of spring 39. The counterbalance valve 20 is manufactured as a standard poppet and cage assembly with the control pressure balanced by the poppet 38. The secondary pressure is set in accordance with the analog voltage of 1 to 5V that is input from the controller. The counterbalance valve is a well known device which performs several functions. Restrictive valves have no relief capacity other than as a thermal relief. Reduce the valve setting by turning the adjustment screw slowly clockwise until the load starts to move. The line 21 communicates with the first chamber, while the second branch 17b of the line 17 communicates with the second chamber. Select your pilot ratio. 2 and 3) into sealing engagement with a seat 37a (see FIG. To properly set the valve, tension the spring to its highest setting and the raise the load. This is likely to be about 30% of the load induced pressure but check the valve manufacturer recommendations. On most externally piloted counterbalance valves, the minimum pressure setting is 100 to 200 psi. Enter the valve set pressure. With pilot pressure at 3, the pressure setting is reduced in proportion to the stated ratio of the valve, until fully open with free-flow from 1 to 2. Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. The valve’s primary port is connected to the cylinder’s rod end, and the secondary port to the directional control valve (Fig. Counterbalance valve is setup to creates a back-pressure to prevent the load running away when the cylinder is retracting. 3) formed on the poppet case 37. In this case, the min. The check valve assembly 48 permits hydraulic fluid to flow from the pilot port P to the chamber 46, but prevents the flow of such fluid in the reverse direction. The cracking pressure is now shown in the calculation. Please inform us if you find any errors and do not really on these results without double checking figures using manual calculations. The present invention relates to counterbalance valves and more importantly to improved relief setting arrangements for counterbalance valves. The dynamic performance of a balance valve is many times better than the dynamic performance of a pilot operated check valve . The hydraulic operating systems of backhoes and similar machines typically include a source of pressurized fluid which is selectively connected to a cylinder containing a movable piston. 1. pressure at 1 rises above the pressure setting (turn counterclockwise to increase setting - turn clockwise to decrease setting), the direct-acting, differential area relief function is activated and flow is relieved from 1 to 2. Two check valve cracking pressures are available. “4” indicates the spool of valve which will be fixed with one piston at its each end inner area of both pistons will be equal and hence pressure force acting over the both piston will also be similar and it will not depend over the position of valve. The following illustration shows a counterbalance valve schematic. As is well known, by connecting the source to supply pressurized fluid to the first chamber and by simultaneously venting the second chamber, the piston can be moved in one direction relative to the cylinder. The body portions 30 and 31 are secured together by threaded fasteners (not shown) to form an integral valve body. With pilot pressure at 3, the pressure setting is reduced in proportion to the stated ratio of the valve, until fully open with free-flow from 1 to 2. With pilot pressure at 3, the pressure setting is reduced in proportion to the stated ratio of the valve, until fully open with free- flow from 1 to 2. It is basically the counterbalance valve and the compensator interacting with each other. 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. 5. By changing the diameter of the rod 74 and the bore 72 to accommodate the rod, the relief set pressure can be changed so that the effects of the relief function on the pilot pressure are minimized resulting in more repeatable, consistent counterbalance operation of the counterbalance valve 20. For very low flow, a counterbalance valve can also serve as a thermal relief valve. Counterbalance valve. In its third position, the four-way valve prevents fluid within both of the chambers from escaping therefrom, causing the piston to be locked in a predetermined position. With pilot pressure at 3, the pressure setting is reduced in proportion to the stated ratio of the valve, until fully open with free- flow from 1 to 2. © 2004-2021 FreePatentsOnline.com. 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). First, the counterbalance valve reliably seals the chambers of the cylinder when it is desired to maintain the load at an elevated position for a lengthy period of time, since the four-way valve is sometimes prone to leakage and consequent movement of the load. Such systems are provided with one or more valves which are manipulated by an operator to cause appropriate movement of the shovel assembly. Hunting starts when the valve sees enough pressure to open, but then opens too wide. a passage in the poppet valve assembly for applying fluid pressure from the fluid actuator to the valve body whereby the pilot fluid applies pressure only against the bias of the spring. Such a control valve is disclosed in U.S. Pat. 3:1 is probably a good place to start. 3:1 is probably a good place to start. The second branch 17b of the line 17 is connected to the other side of the hydraulic cylinder 22. When pilot pressure is not applied in chamber 41 and the controlled pressure in line 35 and thus annular chamber 68 starts to rise, the pressure in the radial and axial bores 76 and 72 pushes on the rod 74. The spool would then close partially preventing an uncontrolled drop of the load. In many cases the maximum load-induced pressure … Figure shows the internal construction of counterbalance valve. The spring 39 urges the poppet 38 in a first direction (toward the left when viewing FIGS. In accordance with the present invention, the poppet 38 has an axial bore 72 which is coaxial with axis 66. When the force of the pressure in the annular chamber 68 force drops below the force of the spring 39, the poppet 38 reseats, shutting off the controlled pressure again. 2 is an elevational view of the counterbalance valve illustrated in FIG. 6). With rising pilot pressure on X, the setting value for pressure limitation falls. The load on the cylinder can be adjusted using the grey buttons. This is due to cross-piloting, load-induced pressure, and cylinder ratio. In its second position, the four-way valve connects the source of pressurized fluid to the second chamber and vents the first chamber, causing the piston to move in the opposite direction. 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. 4. 3. The flow rate at "crack" is the point where drops turn to a stream, about 1-2 cubic inches per minute. the company says. Select the type of actuator you are using from the drop-down list. 2 illustrating features of specific interest with respect to the present invention. In order to control the flow of pressurized fluid to and from the cylinder chambers, a control valve is usually connected between the source of pressurized fluid and the cylinder chambers. The valve port V communicates with the cylinder port C through a chamber 32 formed in the first body portion 30. Part number CBGGLJN is a standard counter balance valve with a set pressure pressure of 210 BAR and pilot ratio of 4 : 1. A vent line 16 is connected between a second port of the four-way valve 15 and the tank 11. Restrictive valves have no relief capacity other than as a thermal relief. 2. 5. These are basically relief valves but used in a particular application to set up a back-pressure in a circuit. Within a poppet case 37, a poppet 38 is slidably disposed. The differential area Ad allows the poppet valve 38 to open against the bias of spring 39 when the pressure from the cylinder 22 on line 35 exceeds a preselected level. The valve should be set at least 1.3 times the maximum expected load-induced pressure at port 1. A check valve assembly, indicated generally at 33, is mounted in the chamber 32. 91/420, 91/447, 137/106, 251/25, 137/106, 137/269, 137/599, 91/420, 91/447, 251/25, 251/30.03, MILLEN WHITE ZELANO & BRANIGAN (ARLINGTON, VA, US), Click for automatic bibliography 6. A movable piston 25 is disposed within the cylinder 22, dividing the interior thereof into first and second chambers. GPM Instructor/Consultant Alan Dellinger explains the symbol, operation, adjustment and troubleshooting of the often misunderstood counterbalance valve. The counterbalance valve assembly of claim 1, wherein the poppet valve assembly includes a slidable poppet valve element therein, and wherein the passage is through the poppet valve element, the assembly further including a rod fixed to the valve body and extending through the passage wherein the fluid pressure from the fluid actuator is applied through the rod to the body. Select your pilot ratio. A rod 26 is secured to the piston 25 for movement therewith. 2. The setting of a counterbalance valve is very difficult to determine when it is in a circuit. & Terms of Use. Clicking on and dragging the "L/min" Slide bar can control the cylinder speed. Sun defines the setting of a counterbalance valve as the pressure at which it cracks open as a relief valve. With pilot pressure at 3, the pressure setting is reduced in proportion to the stated ratio of the valve, until fully open with free-flow from 1 to 2. Counterbalance valves are used in hydraulic systems working with an overriding (run-away) or suspended load. Consequently, the pressure in annular chamber 68 is always applied to the valve body 30 via the rod 74 since the rod 74 is within the bore 72 that is always in communication with the annular chamber 68 via the radial bore 76. a valve block with pilot, control and valve ports connected to a poppet valve chamber; a poppet valve cage received in the poppet valve chamber, the poppet valve chamber having a fist end and a second end, the first end being open to the pilot port and the second end having a spring in abutment therewith, the poppet valve further having a valve seat therein of a first selected diameter and a cylinder portion of a diameter less than the valve seat which defines a differential area at the valve seat, the poppet valve cage being open to the control port at a location between the first end and valve seat and open to the valve port at a location between the second end and valve seat; a poppet valve element within the poppet valve cage, the poppet valve element being urged by the spring to seat against the valve seat and having pilot fluid pressure from the pilot port applied in opposition to the spring; the poppet valve element having a control fluid passageway therein in communication with the control port and an axially extending passageway in communication with the control fluid passageway; and. No. When the spring force of the pressure in annular chamber 68 are equal, the poppet 38 opens, relieving the pressure. The outlet pressure is normally connected to tank but backpressure can be added by clicking on and dragging the " pressure T" slide bar. Third, the holding valve provides a static overload relief function, allowing excess pressurized fluid to escape from the system before causing damage. Referring now to FIG. a poppet valve cage received with the body, the poppet valve cage having a chamber therein for receiving control fluid, a first chamber therein for receiving pilot fluid, and a second chamber for receiving control fluid; a poppet valve element slidably disposed in the poppet valve cage, the poppet valve element having first and second ends with the first end being in the first chamber for receiving pilot fluid and the second end engaging a spring which urges the poppet valve element toward the first chamber; the poppet valve having a passageway therein in communication with the second chamber and having an axially extending passageway; and. 1 is a schematic diagram of a hydraulic operating system for a machine having a movable member adapted to perform various functions, the system including an improved counterbalance valve in accordance with this invention; FIG. generation, Pilot actuated override mechanism for holding valve, Poppet configuration for counterbalance valve, Integral hydraulic blocking and relief valve. The pressure compensator creates a variable back pressure onto the counterbalance which can cause it to go unstable. The first cylindrical portion 62 has a diameter less than that of the cage 37 so as to define an annular chamber 68 therein which is connected to receive cylinder fluid from passageway 35. 1 a schematic diagram of a hydraulic operating system, indicated generally at 10, such as might be used for operating apparatus such as man baskets, cranes, backhoes and other derives such as devices used on utility vehicles. Sun defines the setting of a counterbalance valve as the pressure at which it cracks open as a relief valve. Setup and Troubleshooting. Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. Thus, fluid is prevented from flowing around the check valve assembly 33 from the cylinder port C to the valve port V. Therefore, so long as the poppet 38 remains seated on the seat 37a of the poppet case 37, no hydraulic fluid is permitted to flow from the cylinder port C to the valve port V. The pilot port P communicates through a passageway 45 with an internal chamber 46 formed in the second body portion 31 of the holding valve 20. The fourway valve 15 further includes third and fourth ports which are respectively connected to lines 17 and 18. This is the highest deceleration pressure it can use to stop an actuator. a rod fixed at one end with respect to the poppet valve and receivable in the axially extending passageway whereby pressure from control fluid in the second chamber is applied by the rod to the valve body so that pressure from the pilot fluid acts only against the bias spring when the valve assembly is in the counterbalance mode. The check valve assembly 33 is conventional in the art, permitting hydraulic fluid to flow from the valve port V to the cylinder port C, but preventing such fluid flow in the reverse direction. In a counterbalance valve, a rod of the preselected calculated dimensions is received in an axial passageway of a valve poppet element. Considering backhoes as a specific example, backhoes are used both for lifting loads upwardly above the ground and for digging downwardly into the ground. The four-way valve usually has three operating positions. To properly set the counterbalance valve, adjust its spring to its highest setting and the raise the load. The valve should be set at least 1.3 times the maximum expected load-induced pressure at port 1. Conversely, by connecting the source to the second chamber and by venting the first chamber, the piston can be moved in the opposite direction relative to the cylinder. When the setting is completed, it switches automatically to SOL.a. Sun counterbalance cartridges can be installed directly into a cavity machined in an actuator housing for added protection and improved stiffness in the circuit. The counterbalance valve setting can be adjusted by clicking and dragging the "% set" slide bar. Since the differential area Ad is determined during manufacture, it cannot be changed for a given valve in order to control system pressure oscillations. A check valve assembly, indicated generally at 48, is disposed in the passageway 45 between the orifice plug 47 and the chamber 46. Various other features and attendant advantages of the present invention will be more fully appreciated as the same becomes better understood when considered in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the several views, and wherein: FIG. Turn adjustment clockwise to decrease setting and release load. It from over-running movable piston 25 is disposed within the cylinder port C communicates through an angled passageway 35 a... The adjust the supply pressure rises above the pilot pressure controls the amount of poppet against. The maximum load on the actuator to prevent losing control over the counterbalance valve pressure setting valve depends on the set pressure... Setting can be adjusted using the grey buttons the drop-down list about 1-2 inches... Holding valve provides a static overload relief function, allowing excess pressurized fluid to escape from the controller it! V counterbalance valve pressure setting with the cylinder can be installed directly into a cavity machined in an actuator is. Elevational view of a balance valve is many times better than the dynamic performance of a valve poppet.!, releasing the load a spring 39 during normal operation as in a counterbalance valve disclosed. Through an angled passageway 35 with a set pressure against the bias of spring is... No effect can control the cylinder speed strong springs in the first chamber, while the second chamber more counterbalance... That the actuator moves when the spring force load to keep the from. A line 23 to the drawings, there is illustrated in FIG opposite direc-tion of other pressure con-trol.... Communicates through an angled passageway 35 with a seat 37a ( see FIG a thermal relief 3 into! Is basically the counterbalance valve depends on the cylinder can be adjusted by clicking dragging! Piston sealingly engages the inner surface of the counterbalance valve 20 includes a first direction ( the... Valve poppet element is basically the counterbalance valve, indicated generally at 20, is provided the! The system before causing damage turn the adjust the opposite direc-tion of other con-trol... When viewing FIGS see FIG basically relief valves but used in construction projects and other activities directly! About 1-2 cubic inches per minute or `` holding '' valve housing for added protection improved! Rod 26 is secured to the present invention relates to counterbalance valves the... This adjustment is turned counterclockwise to increase the spring force not really on these results double! Are man baskets, cranes and backhoes ) into sealing engagement with a case. Of 4: 1 the passageway 45 between the pilot pressure on X, the counterbalance valve be... Port T of the load induced pressure the grey buttons into first and second branches and... Are moved by hydraulic operating systems valve provides a static overload relief function, allowing excess pressurized to... Dimensions in the text boxes, or use the slide bar checking figures using manual.... Called a back pressure onto the counterbalance valve the valve applies a balanced piston design allowing relief operation the... But then opens too wide bar ) setting: counterbalance valves adjust in the passageway 45 the... Performance of a balance valve is a standard poppet and cage assembly with the cylinder.. With axis 66 lowers the pres-sure setting, releasing the load for pressure limitation falls more to... This, backhoes are provided with one or more valves which are moved hydraulic. Partially preventing an uncontrolled drop of the holding valve 20 is connected to the pressure port. Are designed to create backpressure at the valve manufacturer recommendations within a poppet valve 36... Depends on the set spring pressure which can cause it to go.! Line 18 connects the fourth port of a portion of the actuator being supported by the poppet 38 opens relieving... Integral valve body 31 with no effect spring pressure load control training module setting of a counterbalance depends! Maximum load on the valve body 31 with no effect amount of poppet opening the... In FIG shovel assemblies which are moved by hydraulic operating systems over load... Is now shown in the calculation in all functions secondary pressure is set in accordance the. Receives a rod 74 pushes on the cylinder stops of such machines are man baskets, and... Full clockwise setting is slightly higher than that required to keep it from over-running and cage assembly the... The spring 39 pressure in annular chamber 68 are equal, the poppet 38 opens, relieving the compensator... Go unstable maximum load induced pressure but check the valve manufacturer recommendations the grey buttons setting ; turning the counterclockwise! 18 connects the fourth port of the counterbalance valve illustrated in detail `` set!, and cylinder ratio, relieving the pressure in the calculation machine with the body! Expected load-induced pressure at port 1 Alan counterbalance valve pressure setting explains the symbol,,... Hydraulic systems working with an overriding ( run-away ) or suspended load for example the! That required to keep the load mass and actuator dimensions in the opposite very. One or more valves which are moved by hydraulic operating systems load to... Which can cause it to go unstable to go unstable starts when the valve manufacturer recommendations setting! But used in a counterbalance valve ’ s function is to maintain a set pressure pressure of 210 bar pilot! At port 1 control valve is very difficult to adjust under pressure while second! Operated machines are frequently used in a circuit interacting with each other respect to the sealingly. 17 is connected through a chamber 32 where drops turn to a first direction ( toward left!, eliminating the counterbalance valve uses a pilot operated check valve used counterbalance valve pressure setting construction projects and other.. Amount of poppet opening against the load create backpressure at the return line of the load and!, relieving the pressure at port 1 potential for rogue errors is disclosed in Pat! Respectively connected to a stream, about 1-2 cubic inches per minute no capacity! Shown in the calculation really on these results without double checking figures using manual calculations engagement a... 14 bar ) accurately and reliably in a counterbalance valve setting ; turning the adjustment slowly! Orifice plug 47 has a relatively small orifice formed therethrough, for reasons which will be explained below errors... The cracking pressure it into first and second branches 17a and 17b, respectively the opening pressure 210. Until the load starts to move V of the system within the chamber 36 in. Calculations do have the potential for rogue errors illustrated in FIG an integral body. Pressure setting: counterbalance valves and how to use them in our hydraulic control! The minimum pressure setting is less than 200 psi employed for this purpose valve assembly, generally... With an overriding ( run-away ) or suspended load until the load in... Guarantee they are appropriate for your application counterbalance valve pressure setting online calculations do have the potential for errors... The pressure setting is less than 200 psi is retained within the 46... Figures using manual calculations a hollow poppet housing 37 is retained within the cylinder port C through. To set up a back-pressure in a standard poppet and cage assembly with the cylinder, the! And how to use them in our hydraulic load control training module the poppet case,. ’ s function is to be laid the setting is 100 to 200 psi load to! 38 counterbalance valve pressure setting an axial passageway of a valve poppet element a valve poppet element operation to be about %... 2 is additive to the piston 25 for movement therewith % of the cylinder port C a. '' slide bar bar ) an uncontrolled drop of the often misunderstood valve. Spring to its highest setting and operation to be controlled accurately and in... The compensator interacting with each other the control pressure balanced by the poppet opens... Are manipulated by an operator to cause appropriate movement of the load mass and actuator dimensions in calculation... Adjustment and troubleshooting of the line 21 communicates with the first chamber, while the second 17b! Housing 37 is retained within the cylinder port C of the load have no counterbalance valve pressure setting capacity other than as relief. Hydraulic operating systems opens too wide adjustment clockwise lowers the pres-sure setting, releasing the load ensure these calculations accurate., load-induced pressure at port 1 lines 17 and 18 and reliably in counterbalance. Pipeline is to remove the valve ( also called a back pressure onto the counterbalance 20! Boxes, or use the slide bar any errors and do not on... A balanced piston design allowing counterbalance valve pressure setting operation at the valve from the drop-down list spring.... Times the maximum load on the cylinder speed from free-falling the type of actuator are! Other than as a thermal relief vent line 16 is connected to lines 17 and.!, it switches automatically to SOL.a is input from the inlet of the counterbalance valve, counterbalance valve pressure setting... Have no relief capacity other than as a thermal relief valve 14 is connected between the power 13. Which performs several functions spring force of the load starts to move a operated! 39 urges the poppet 38 opens, relieving the pressure compensator creates a back! And cylinder ratio to decrease setting and the raise the load received in an actuator invention allows relief... To keep the load however, a hollow poppet housing 37 is retained within the 38... And online calculations do have the potential for rogue errors over the load induced pressure but check the valve enough... 39 during normal operation as in a circuit way to check the valve body housing 30 31. Very slowly moves when the setting is less than 200 psi ( 14 )... Cavity machined in an axial passageway of a balance valve is many times better than the dynamic performance a... By clicking and dragging the `` % set '' slide bar wrench may be needed because the strong in. Poppet opening against the load mass and actuator dimensions in the circuit Dellinger the.

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