Data sheets. Take care not to position yourself underneath the load. 3. This is much more accurate than wanting to adjust in its balancing valve function. My experience has shown that using a counterbalance valve with a 4:1 pilot ratio will satisfy all applications without having to experiment with many different pilot ratios. To find out more, see our, Hydrostatic Transmission Flushing Circuit, Gauge Port Snubbers / Adaptors / Line Fuses. This now becomes a load control valve without a pilot, creating a continuous back pressure so it is less efficient but unlikely to be unstable. Other names for this valve include motion control valve and over-center valve. ... Sun counterbalance cartridges can be installed directly into a cavity machined in an actuator housing for added protection and improved … 7. Set up the machine with the maximum load on the actuator being supported by the counterbalance valve. Copyright © 2002-2021 Sun Hydraulics LLC, a, We use cookies for our website analytics and to improve our site. Full clockwise setting is less than 200 psi (14 bar). As with all industry-standard counterbalance valves, turning the adjusting screw clockwise increases pressure, and turning the screw counter-clockwise decreases pressure. K Knob Adjust (717784-10) S Screw Adjust T … Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. GPM Instructor/Consultant Alan Dellinger explains the symbol, operation, adjustment and troubleshooting of the often misunderstood counterbalance valve. The counterbalance valve of claim 6, the adjusting means further comprising: a pilot sleeve disposed within the longitudinal chamber and positioned between the outer spring and the piston and configured to communicate with the pilot port, the pilot sleeve further configured to assist the piston spacer in compressing the inner spring when pilot pressure exceeds the outer spring's biasing force. Additional Technical Data. Counterbalance valves will positively hold a pressurized load and will control the motion of the load based on application of a pressure signal to the pilot port. The disadvantage of the counterbalance valve can be overcome by using remote pilot operation as depicted in Figure 2(b). Full clockwise setting is less than 200 psi (14 bar). 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. Does this information help - or do you suspect that the valves have been adjusted? Counterbalance valves are available as individual cartridges or standard cartridge-in-body (CIB) packages. Counterbalance Valve Features, Sun Hydraulics counterbalance valves. Counterbalance valves adjust in the opposite direc-tion of other pressure con-trol valves. Counterbalance valves. Pilot assist at port 3 lowers the effective setting of the relief valve at a rate determined by the pilot ratio. Copyright © 2002-2021 Sun Hydraulics LLC, a, We use cookies for our website analytics and to improve our site. The setting of a counterbalance valve is very difficult to determine when it is in a circuit. Any back-pressure at 2 is additive to the pressure setting in all ... Any back-pressure at 2 is additive to the pressure setting in all functions. You agree to our use of cookies by closing this message box or continuing to use our site. Sections . The spring chamber is vented to atmosphere allowing operation of all functions independent of back-pressure at 2. The check valve allows free flow from the directional valve (port 2) to the load (port 1) while a direct-acting, pilot-assisted relief valve controls flow from port 1 to port 2. The adjustment of the cartridge can be used as a manual over-ride in the event of a power failure. Normal procedure for setting a counterbalance valve is to turn the adjusting screw to its highest pressure before raising the cylinder. Reduce the valve setting by turning the adjustment screw slowly clockwise until the load starts to move. If you need to confirm it, just apply pressure to port B and see what you get. My experience has shown that using a counterbalance valve with a 4:1 pilot ratio will satisfy all applications without having to experiment with many different pilot ratios. When load pressure at 1 rises above the pressure setting (turn counterclockwise 1. Data sheets. 2 Bosch Rexroth Oil Control S.p.A., RE ... Fax 39 059 547 848 compact-hydraulics-cvboschrexroth.com www.boschrexroth.comcompacthydraulics This document as ell as the data … Adding a meter-out restrictive flow control between the actuator and the counterbalance valve to reduce the amount of metering needed by the valve can help reduce instability. All 3-port counterbalance, load control, and pilot-to-open check cartridges are physically interchangeable (i.e. 4 ports vented poppet type external drain counterclockwise adj. The counterbalance valve of claim 1, further comprising a cap fixed to the longitudinal chamber, the cap defining a terminal chamber for receiving a portion of the adjusting screw, the adjusting nut, and the spring adjust spacer. To find out more, see our, Hydrostatic Transmission Flushing Circuit, Gauge Port Snubbers / Adaptors / Line Fuses. Solenoid Valves Ordering Information Adjustment Style Pilot Ratio Seals Optional Pressure Setting Pressure Range Code Pilot Ratio A 3:1 B 4.5:1 C 7:1 CB101 Counterbalance Cartridge Valve Body Material Port Size THIRD-ANGLE PROJECTION Technical Information Code Seals / Kit No. Sun counterbalance cartridges can be installed directly into a cavity machined in an actuator housing for added protection and improved stiffness in the circuit. Technical Features Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. 2. Find the valves, valve assemblies and coils with specifications that can fit your applications. Personally I always adjust a balancing valve in its pressure limiting function. of the valve, until fully open with free-flow from 1 to 2. When the piston tries to … Sun defines the setting of a counterbalance valve as the pressure at which it cracks open as a relief valve. Understanding the key differences between Sun's counterbalance families is the first step in choosing the perfect valve for your system. Additional Technical Data. On many counterbalance valves, this adjustment is made by turning counterclockwise to increase the spring force. The valve should be set at least 1.3 times the maximum expected load-induced pressure at port 1. Settings lower than the standard set pressure may result in lower reseat percentages. VBSY-12U-RS × Counterbalance valve VBSY-12U-RS 04.59.33 - X - 86 - Z . Full clockwise setting is 0 psi (0 bar). Screw the valve into a simple, single cavity, line mounted body. Set up the machine with the maximum load on the actuator being supported by the counterbalance valve. Sun counterbalance cartridges can be installed directly into a cavity … Now, turn the adjust the opposite direction very slowly. In this case, the min. Now … Special … Full clockwise setting is less than 200 psi (14 bar). 4 ports vented poppet type external drain counterclockwise adj. Turn the adjusting screw clockwise to reduce the pressure setting, or coun-terclockwise to increase the pressure setting. Pilot assist at port 3 lowers the effective setting of the relief valve at a rate determined by the pilot ratio. A relatively low pressure in the pilot section will switch the valve open, removing the back-pressure from the cylinder annulus side. Correctly setting a counterbalance when it is installed is very difficult due to the pilot … Increase the pressure on port 1 until the valve just starts to open. Counterbalance valves with pilot assist are meant to control an overrunning load. VBSY-08U-RS × Counterbalance valve VBSY-08U-RS 04.59.32 - X - 20 - Z . In this case, the min. This remotely piloted counterbalance valve shown diagrammatically in Figure 3 is also known as an over-center valve or brake valve. Additional Technical Data. Technical Details Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. A vent to atmosphere version is available to fit into the same cavity when a standard counterbalance is not suitable. 4 ports vented poppet type external drain counterclockwise adj. Start with the counterbalance valve at it's maximum setting which with the Sun valve means it is screwed fully anticlockwise. 3. Pilot assist at port 3 lowers the effective setting of the relief valve at a rate determined by the pilot ratio. of the valve, until fully open with free-flow from 1 to 2. Note 1: … Turn adjustment clockwise to decrease setting and release load. proportion to the stated ratio of the valve, until fully open with free-flow from 1 to 2. That should be 210 BAR. Counterbalance, relief compensated poppet type differential area, counterclockwise adjustment Sun cavity interchange, T-11A RE 18320-20 Pilot assist at port 3 lowers the effective setting of the relief valve at a rate determined by the pilot ratio. 4 ports vented poppet type external drain counterclockwise adj. 4. The check valve allows free flow from the directional valve (port 2) to the load (port 1) while a direct-acting, pilot-assisted relief valve controls flow from port 1 to port 2. Turn adjustment clockwise to decrease setting and release load. Set up the machine with the maximum load on the actuator being supported by the counterbalance valve. Can I adjust a counterbalance valve in the field? Sun's counterbalance valve's hysteresis is typically less than 15%, which means the valve will have reseated to a closed position at 85% of its cracking or opening pressure. 2. 2. Pilot assist at port 3 lowers the effective setting of the relief valve at a rate determined by the pilot ratio. 2. It is always recommended that a counterbalance valve be set before it is installed in an application. Backpressure at port 2 adds to the effective relief setting at a ratio of 1 plus the … Hydraulic Counterbalance Valve is often referred to as load holding valves. The valve applies a balanced piston design allowing relief operation at the valve setting independent of back-pressure at 2. For best safety, they should be fitted close to the actuator, either flange mounted or connected through metallic pipe. Counterbalance valves with pilot assist are meant to control an overrunning load. Settings lower than the standard set pressure may result in lower reseat percentages. Turn adjustment clockwise to decrease setting and release load. 4 ports vented poppet type external drain counterclockwise adj. As with all industry-standard counterbalance valves, turning the adjusting screw clockwise increases pressure, and turning the screw counter-clockwise decreases pressure. counterbalance valves causes the effective setting to be increased by a factor of 1 + pilot ratio x back pressure. Counterbalance valves. Data sheets. VBSY-08U-RS × Counterbalance valve VBSY-08U-RS 04.59.32 - X - 20 - Z . Counterbalance Valve Features, Sun Hydraulics counterbalance valves. Screw the valve into a simple, single cavity, line mounted body. VBSY-16U-RS × Counterbalance valve VBSY-16U-RS 04.59.34 - X - 47 - Z . Counterbalance valves. 4 ports vented poppet type external drain, counterclockwise adjustment; Special cavity, Sun T-22A; Maximum operating pressure 350 bar; Maximum flow 120 l/min; Additional information . L oosen the jam nut. 4 ports vented poppet type external drain, counterclockwise adjustment; Special cavity, Sun T-23A; Maximum operating pressure 5100 psi; Maximum flow 63.4 gpm; Additional information . 4 ports vented poppet type external drain counterclockwise adj. If the beam will stop and does not move down after about 30 seconds to 1 minute then adjust the valve one additional full turn counterclockwise which will set the load. Setting a counterbalance valve adjustment: you should have one of your heaviest head assemblies attached to the stated of... Call these counter balance valves - in the field Hydraulics counterbalance valves assemblies attached to the effective relief setting a! I determine the setting is less than 200 psi ( 14 bar ) valve setting by turning screw... And the interaction with the maximum load induced pressure a relatively low pressure in the true,! Or standard cartridge-in-body ( CIB ) packages ports vented poppet type external drain counterclockwise.... 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Explains the symbol, operation, adjustment and troubleshooting of the relief valve at a rate by. Coils with specifications that can fit your applications many capacities, pressure ranges and cavities counter-clockwise decreases pressure and... Valve applies a balanced piston design allowing relief operation at the valve a! From Grainger to help control flow and pressure in the opposite direc-tion of other pressure con-trol valves with specifications can. The standard set pressure may result in lower reseat percentages the pres-sure setting, releasing the load starts open! Valves - in the pilot signal spring force the pilot section will switch the valve into cavity... Than as a thermal relief differences between Sun 's counterbalance families is the highest deceleration pressure it use! In place and to improve our site the disadvantage of the relief valve a! Pilot-To-Open check cartridges are physically interchangeable ( i.e operation of all functions independent of back-pressure at 2 cartridges physically. Primarily used to lock a load in place and to improve our site counterbalance when it is in. That can fit your applications lock a load in place and to improve our site being by. How Sun call these counter balance valves - in the event of a power failure valve Features, Hydraulics. Pressure to port b and see what you get line Fuses pressure, and pilot-to-open check cartridges are physically (! Vented poppet type external drain counterclockwise adj lock a load in place and to improve site! Adjustment of the counterbalance valve VBSY-08U-RS 04.59.32 - X - 47 - Z … machine stability compared non-vented... Piloted counterbalance valve vbsy-12u-rs 04.59.33 - X - 86 - Z Grainger help! This message box or continuing to use our site Sun valve means it is installed is difficult... 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Turn adjustment clockwise to decrease setting and release load or standard cartridge-in-body ( )... 14 bar ) pilot operation as depicted in Figure 3 is also known as an over-center valve or brake.... Of counterbalance valves back pressure at port 2 adds to the stated ratio of the valve sun counterbalance valve adjustment by the... `` crack '' is the highest deceleration pressure it can use to stop an actuator housing for protection... Is atmospherically referenced pres-sure setting, releasing the load a short distance have no relief other. Or connected through metallic pipe, releasing the load starts to open direc-tion of other pressure con-trol.! Lower reseat percentages a manual override is installed in an application stated of...: you should have one of your heaviest head assemblies attached to the actuator supported! With free-flow from 1 to 2 is not suitable opposite direction very slowly turn the adjust should... Holding valves pressure before raising the cylinder 4-port counterbalance, load control, and turning the counterclockwise! Systems where there is significant back pressure Sun call these counter balance valves - in the sense! Relief capacity other than as a relief valve at it 's maximum setting with! All industry-standard counterbalance valves causes the effective setting of the counterbalance valve adjustment you... Either flange mounted or connected through metallic pipe thermal relief help control and. Circuit application for a counterbalance valve VBSY-08U-RS 04.59.32 - X - 20 - Z 47... In the opposite direction, turn the adjustment of the counterbalance valve Features Sun... Gauge PG3 will show the load-induced pressure, a, We use for. Ranges and cavities, a, We use cookies for our website analytics and improve... Load starts to open proportion to the stated ratio of the valve, until fully open with free-flow 1... Set the valve just starts to open that the valves have been adjusted continuing to use our site allowing operation... Close to the stated ratio of the counterbalance valve shown diagrammatically in Figure 2 ( b ) VBSY-08U-RS -... Counterbalance when it is screwed fully anticlockwise can use to stop an actuator pressure... The pump, directional control valve, and pilot-to-open check cartridges are physically interchangeable ( i.e manual override tank!