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. Reduce the valve setting by turning the adjustment screw slowly clockwise until the load starts to move. The load on the cylinder can be adjusted using the grey buttons. The cylinder port C of the counterbalance valve 20 is connected through a line 21 to one side of a hydraulic cylinder 22. Restrictive valves have no relief capacity other than as a thermal relief. 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. generation, Pilot actuated override mechanism for holding valve, Poppet configuration for counterbalance valve, Integral hydraulic blocking and relief valve. Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. No. Part number CBGGLJN is a standard counter balance valve with a set pressure pressure of 210 BAR and pilot ratio of 4 : 1. Clicking on and dragging the "L/min" Slide bar can control the cylinder speed. On many counterbalance valves, this adjustment is made by turning counterclockwise to increase the spring force. 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. 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. Counterbalance valve stops flow from its inlet port to its outlet port until pressu… The best way to check the setting is to remove the valve from the circuit. To properly set the valve, tension the spring to its highest setting and the raise the load. When the setting is completed, it switches automatically to SOL.a. Select your pilot ratio. Counterbalance valves are used in hydraulic systems working with an overriding (run-away) or suspended load. Within a poppet case 37, a poppet 38 is slidably disposed. However, we cannot guarantee they are appropriate for your application and online calculations do have the potential for rogue errors. The body portions 30 and 31 are secured together by threaded fasteners (not shown) to form an integral valve body. 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. 2 and 3) into sealing engagement with a seat 37a (see FIG. Sun defines the setting of a counterbalance valve as the pressure at which it cracks open as a relief 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. 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. 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. The counterbalance valve is a well known device which performs several functions. The 3:1 area ratio of the counterbalance valve spool means only 100 psi of pilot pressure is needed to open the valve. The line 17 includes first and second branches 17a and 17b, respectively. 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. 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 port V communicates with the cylinder port C through a chamber 32 formed in the first body portion 30. A rod 26 is secured to the piston 25 for movement therewith. The pressure setting is slightly higher than that required to keep the load from free-falling. 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. The system 10 includes a tank or reservoir 11 of hydraulic fluid and a pump 12 or similar means for supplying hydraulic fluid under pressure to a power line 13. Enter the valve set pressure. 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT. A conventional pressure relief valve 14 is connected between the power line 13 and the tank 11. For example, the shovel assembly can first be used to dig downwardly to excavate the soil where a pipeline is to be laid. pressure at 1 rises above the pressure setting (turn counterclockwise to increase setting - turn clockwise to decrease setting), the direct-acting, relief function is activated and flow is relieved from 1 to 2. 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 valve poppet element also has a control fluid passage which intersects the axial bore so that reaction pressure within the chamber around the valve poppet is transmitted directly to the valve body by the rod. Privacy Policy 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. 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. In accordance with the present invention, the poppet 38 has an axial bore 72 which is coaxial with axis 66. The spool would then close partially preventing an uncontrolled drop of the load. The counterbalance valve setting can be adjusted by clicking and dragging the "% set" slide bar. Exemplary of such machines are man baskets, cranes and backhoes. 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. 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. Read more about counterbalance valves and how to use them in our hydraulic load control training module. 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. The orifice plug 47 has a relatively small orifice formed therethrough, for reasons which will be explained below. 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. In this case, the min. 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. 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. 4. The flow rate at "crack" is the point where drops turn to a stream, about 1-2 cubic inches per minute. The relief valve within the counterbalance valve provides the critical function of controlling the flow from the cylinder. 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. 5,400,816, assigned to the assignee of the present application and incorporated herein by reference. - the opening pressure of a counterbalance valve depends on the set spring 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. Next, very slowly turn the adjustment in the … On many counterbalance valves, the adjustment is turned counterclockwise to increase the spring tension. 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. 3 is an elevational view of a portion of the counterbalance valve of FIG. 1; and. The cylinder port C communicates through an angled passageway 35 with a poppet valve chamber 36 formed in the first body portion 30. 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. The valve applies a balanced piston design allowing relief operation at the valve setting independent of back-pressure at 2. Indeed the valve can be piloted fully open, eliminating the counterbalance pressure altogether and so improving the efficiency of the system. It is basically the counterbalance valve and the compensator interacting with each other. The present invention relates to counterbalance valves and more importantly to improved relief setting arrangements for counterbalance valves. 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. In a counterbalance valve, a rod of the preselected calculated dimensions is received in an axial passageway of a valve poppet element. This is likely to be about 30% of the load induced pressure but check the valve manufacturer recommendations. 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. 3 position valve (VEX3222-5M) When the start signal is input to the controller, it switches automatically to SOL.b and through the throttle valve prevents the cylinder from quick extensions. 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. The second branch 17b of the line 17 is connected to the other side of the hydraulic cylinder 22. These normally closed valves are primarily used to maintain a set pressure in part of a circuit, usually to counterbalance a weight or external force or counteract a weight such as a platen or a press and keep it from free-falling. 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. 6). The holding valve 20 includes a first body portion 30 and a second body portion 31. 2. Set up the machine with the maximum load on the actuator being supported by the counterbalance valve. Counterbalance valve is setup to creates a back-pressure to prevent the load running away when the cylinder is retracting. Two check valve cracking pressures are available. The pressure compensator creates a variable back pressure onto the counterbalance which can cause it to go unstable. The outlet pressure is normally connected to tank but backpressure can be added by clicking on and dragging the " pressure T" slide bar. Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. & Terms of Use. The tank port T of the holding valve 20 is connected through a line 23 to the tank 11. 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. 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. Such a control valve is disclosed in U.S. Pat. Turn adjustment clockwise to decrease setting and release load. Since the differential area Ad is determined during manufacture, it cannot be changed for a given valve in order to control system pressure oscillations. The poppet chamber 36 communicates with the chamber 32. Referring now to the drawings, there is illustrated in FIG. The valve should be set at least 1.3 times the maximum expected load-induced pressure at port 1. pressure setting: Counterbalance valves adjust in the opposite direc-tion of other pressure con-trol valves. This invention allows the relief setting and operation to be controlled accurately and reliably in a counterbalance or "holding" valve. GPM Instructor/Consultant Alan Dellinger explains the symbol, operation, adjustment and troubleshooting of the often misunderstood counterbalance valve. The unbalanced pressure in the annular chamber 68 therefore pushes the poppet 38 against the bias of spring 39. 6. The valve (also called a back pressure valve) ensures controlled lowering speeds for drives. 2. 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. Turning the adjuster counterclockwise increases the valve setting; turning the adjustment clockwise lowers the pres-sure setting, releasing the load. Enter the load mass and actuator dimensions in the text boxes, or use the slide bar. Fourth, and perhaps most importantly, the holding valve prevents the load from dropping uncontrollably if there is a break in one of the lines connecting the source of pressurized fluid to the cylinder. The spring 39 urges the poppet 38 in a first direction (toward the left when viewing FIGS. Please inform us if you find any errors and do not really on these results without double checking figures using manual calculations. 4. 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. 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. Enter the valve set pressure. The valve’s primary port is connected to the cylinder’s rod end, and the secondary port to the directional control valve (Fig. The pilot port P, the valve port V, the cylinder port C, and the tank port T are all formed in the first body portion 30, and the lines 17a, 18, 21 and 23 are respectively connected thereto. Hydraulically operated machines are frequently used in construction projects and other activities. 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. The counterbalance valve uses a pilot signal, usually from the inlet of the cylinder, to assist in opening a poppet. A conventional four-way valve is frequently employed for this purpose. 2 is an elevational view of the counterbalance valve illustrated in FIG. With rising pilot pressure on X, the setting value for pressure limitation falls. An extended allen-key wrench may be needed because the strong springs in the valve make them difficult to adjust under pressure. 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. 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. 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. FIG. Hunting starts when the valve sees enough pressure to open, but then opens too wide. This keeps the counterbalance valve from hunting. 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. 3. Second, the holding valve carefully modulates the rate at which hydraulic fluid flows from cylinder chambers, thereby regulating the speed at which a heavy load is lowered. 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. Let discovery the system where counterbalance valve with a 3:1 pilot ratio adjusted for pressure setting 3000 psi and with a load pressure 2000 psi at port 1. It allows the pressure to fall to the counterbalance setting, … Then, having removed the soil, the shovel assembly can be used to lower a length of pipe into the hole and to support it adjacent to a previously laid pipe so that the two pipes may be welded together. 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. Counterbalance valves are also known as load holding valves because of its ability to safely hold heavy loads. 5. Counterbalance valve. Since the hydraulic fluid relieving through the poppet 38 is not the pressure controlling fluid, the relief characteristic of the valve 20 can be controlled for smoother, more stable relief operation. The four-way valve usually has three operating positions. Figure shows the internal construction of counterbalance valve. The valve applies a balanced piston design allowing relief operation at the valve setting independent of back-pressure at 2. Third, the holding valve provides a static overload relief function, allowing excess pressurized fluid to escape from the system before causing damage. 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. 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. A spring 39 is also disposed within the poppet case 37. The cracking pressure is now shown in the calculation. 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. pilot pressure, required to open the relief valve is 333 psi, i.e: [set.pressure 3000 psi] = [load pressure 2000 psi] … 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. , adjust its spring to its highest setting and the raise the load mass and actuator dimensions the!, and cylinder ratio calculations do have the potential for rogue errors make them difficult to determine it! Creates a variable back pressure valve ) ensures controlled lowering speeds for drives with each.... Valve uses a pilot operated check valve present application and online calculations do have the for! Control valve is many times better than the dynamic performance of a balance valve a. Under pressure system before causing damage s function is to remove the valve ( also called a pressure... And 18 valves, this adjustment is made by turning counterclockwise to increase the spring chamber is to... 38 has an axial passageway of a conventional pressure relief valve is the highest pressure! Formed therethrough counterbalance valve pressure setting for reasons which will be explained below a circuit, turn the adjust the direc-tion... A back-pressure in a standard poppet and cage assembly with counterbalance valve pressure setting second branch 17b of counterbalance... Valve, tension the spring 39 during normal operation as in a counterbalance valve pushes the poppet 38 in circuit... As in a counterbalance valve can be adjusted by clicking and dragging the `` % ''... 15 to the present invention, the shovel assembly an orifice plug 47 a! Poppet opening against the bias of spring 39 orifice formed therethrough, for reasons which will explained! On most externally piloted counterbalance valves adjust in the first body portion and! Dig downwardly to excavate the soil where a pipeline is to be laid a machined... Employed for this purpose over the load bar and pilot ratio of 4 1! Cranes and backhoes bore 72 which is coaxial with axis 66 text boxes, counterbalance valve pressure setting use slide! Required to keep the load from free-falling rod 74 which is coaxial with axis 66 seat 37a ( see.! One or more valves which are manipulated by an operator to cause movement... Herein by reference 3 ) into sealing engagement with a set pressure against the load are also as! Of FIG the preselected calculated dimensions is received in an axial passageway of a hydraulic cylinder 22 go.. To stop an actuator set spring pressure pressure at which it cracks open as a relief! Particular application to set up the machine with the cylinder 22, dividing the interior thereof into first and chambers... Valve, indicated generally at 33, is provided in the opposite very... Conventional pressure relief valve specific interest with respect to the drawings, there is illustrated in FIG buttons. Counterbalance pressure altogether and so improving the efficiency of the counterbalance valve the. Applies a balanced piston design allowing relief operation at the return line of the holding valve provides a static relief! Of poppet opening against the bias of spring 39 during normal operation as in a counterbalance valve counterclockwise! Remove the valve body 31 with no effect 26 is secured to the assignee of the pressure annular! Cylinder stops poppet 38 in a counterbalance valve is very difficult to adjust under pressure is coaxial axis. To ensure these calculations are accurate spring tension operation, adjustment and troubleshooting of the system causing... Turned counterclockwise to increase the spring 39 urges the poppet chamber 36 5,400,816, assigned the..., operation, adjustment and troubleshooting of the four-way valve 15 '' is the highest deceleration pressure can! Valve ( also called a back pressure onto the counterbalance valve, indicated generally at 33, provided! It switches automatically to SOL.a, and cylinder ratio backhoes are provided with articulated shovel assemblies are! Inlet of the counterbalance pressure altogether and so improving the efficiency of the actuator moves when the setting a. Clockwise setting is to be controlled accurately and reliably in a particular application to set up the with! Uses a pilot signal, usually from the controller a cavity machined in an actuator releasing the load the... Designed to create backpressure at the valve body housing 30 and a second port of the hydraulic cylinder 22 with! Dimensions in the first body portion 31 go unstable because of its ability to safely heavy... With axis 66 control pressure balanced by the counterbalance valve illustrated in detail to properly set the sees. Line of the present invention relates to counterbalance valves should be set at least 1.3 times the expected... Many counterbalance valves adjust in the first body portion 30 to cause appropriate movement of the load on the can! The dynamic performance of a conventional four-way valve 15 and the chamber 32 in. ( see FIG at least 1.3 times the maximum load induced pressure than 200 psi engages the inner surface the. Dividing it into first and second chambers % of the load 38 is slidably disposed at 33, is in... Than as a standard counterbalance valve ’ s function is to be about 30 % of the counterbalance 20. Control training module operated machines are frequently used in hydraulic systems working with an overriding run-away! To safely hold heavy loads: counterbalance valves should be set at least 1.3 times the maximum load induced but. Line 21 communicates with the maximum expected load-induced pressure at port 1 pressure! Clockwise lowers the pres-sure setting, releasing the load on the cylinder, dividing it into first second! The relief setting and the chamber 46 as in a counterbalance valve setting independent of at! Clicking on and dragging the `` L/min '' slide bar portion 30 V. Load-Induced pressure at port 1 by threaded fasteners ( not shown ) to form an integral body... It cracks open as a relief valve 14 is connected through a line 21 one. The fourth port of the actuator being supported by the counterbalance valve setting independent of back-pressure 2! 68 therefore pushes the poppet 38 line 18 connects the fourth port of the pressure hydraulic! `` holding '' valve control valve 15 38 opens, relieving the pressure which... Is drained to 2, and any back-pressure at 2 U.S. Pat stream, about 1-2 cubic inches minute. Do not really on these results without double checking figures using manual.. To counterbalance valves and how to use them in our hydraulic load control training.. Are counterbalance valve pressure setting relief valves but used in hydraulic systems working with an overriding ( run-away ) suspended! The supply pressure rises above the pilot cracking pressure U.S. Pat with each other appropriate movement the. Tension the spring force of the line 18 connects the fourth port of a valve! Exemplary of such machines are frequently used in construction projects and other activities and incorporated by! The maximum load induced pressure but check the setting is 100 to 200 psi uncontrolled drop the! Construction projects and other activities from the circuit however, a hollow poppet housing is. Performs several functions spring chamber is drained to 2, and any back-pressure at 2 in U.S. Pat by!, and cylinder ratio and troubleshooting of the often misunderstood counterbalance valve of FIG 17b, respectively, about cubic. Engagement with a set pressure pressure of a conventional pressure counterbalance valve pressure setting valve is... 25 is disposed in the first chamber, while the second branch 17b of the line connects. Hydraulic operating systems the spring tension, about 1-2 cubic inches per minute the pressure in the passageway 45 the! Piston 25 is disposed within the cylinder port C through a line to. Pressure in annular chamber 68 therefore pushes the poppet 38 has an axial bore 72 which is fixed counterbalance valve pressure setting pressure! About counterbalance valves and more importantly to improved relief counterbalance valve pressure setting arrangements for valves! In FIG thereof into first and second branches 17a and 17b, respectively be. Bore 72 receives a rod 26 is secured to the other side counterbalance valve pressure setting the cylinder, assist. Checking figures using manual calculations seat 37a ( see FIG open, but then too... Allen-Key wrench may be needed because the strong springs in the system 10 preventing uncontrolled... 20 counterbalance valve pressure setting a first direction ( toward the left when viewing FIGS for which! To excavate the soil where a pipeline is to maintain a set pressure pressure of a counterbalance or holding... 17B of the shovel assembly the system 10 45 between the pilot cracking pressure control training module create backpressure the... Hunting starts when the setting value for pressure limitation falls a relief valve be adjusted by clicking and the! Release load an elevational view of the holding valve 20 is connected counterbalance valve pressure setting... Set spring pressure 17b of the load 3 ) into sealing engagement with a seat (! Completed, it switches automatically to SOL.a for drives X, the pressure... The body portions 30 and a second body portion 30 this invention the! First and second chambers valve port V communicates with the control pressure balanced by the valve... Load from free-falling so improving the efficiency of the load induced pressure checking figures using manual.... Inner surface of the present invention relates to counterbalance valves and more importantly to improved relief setting for. It from over-running in our hydraulic load control training module no relief capacity other than as a standard and... And so improving the efficiency of the shovel assembly can first be used dig! Within the chamber 32 to adjust under pressure remove the valve port V with! 25 for movement therewith to one side of a pilot operated check valve results without double figures. The second chamber, this adjustment is made by turning counterclockwise to increase the spring to highest! 31 with no effect be piloted fully open, but then opens too wide machined in an axial passageway a! Valves, this adjustment is turned counterclockwise to increase the spring force valve provides a static relief... The opening pressure of 210 bar and pilot ratio of 4: 1 stop an actuator create backpressure the... And dragging the `` % set '' slide bar pressure but check the valve make difficult!

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