1. A vent to atmosphere version is available to fit into the same cavity when a standard counterbalance is not suitable. Vent to atmosphere version. VBSY-08U-RS × Counterbalance valve VBSY-08U-RS 04.59.32 - X - 20 - Z . Screw the valve into a simple, single cavity, line mounted body. The disadvantage of the counterbalance valve can be overcome by using remote pilot operation as depicted in Figure 2(b). Backpressure at port 2 adds to the effective relief setting at a ratio of 1 plus the … 4 ports vented poppet type external drain, counterclockwise adjustment; Special cavity, Sun T-21A; Maximum operating pressure 280 bar; Maximum flow 60 l/min; Additional information . Full clockwise setting is less than 200 psi (14 bar). Data sheets. 3. Data sheets. Correctly setting a counterbalance when it is installed is very difficult due to the pilot assist and the interaction with the actuator. VBSY-08U-RS × Counterbalance valve VBSY-08U-RS 04.59.32 - X - 20 - Z . Reduce the valve setting by turning the adjustment screw slowly clockwise until the load starts to move. Repeat several times to ensure consistency. Turn adjustment clockwise to decrease setting and release load. 1. Counterbalance Valve Features, Sun Hydraulics counterbalance valves. Increase the pressure on port 1 until the valve just starts to open. The setting of a counterbalance valve is very difficult to determine when it is in a circuit. Turn adjustment clockwise to decrease setting and release load. 4. 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 adjustment; Special cavity, Sun T-22A; Maximum operating pressure 350 bar; Maximum flow 120 l/min; Additional information . Special cavity. Sun four port counterbalance valves add a drain port (port 4) to the cartridge which makes the Normal procedure for setting a counterbalance valve is to turn the adjusting screw to its highest pressure before raising the cylinder. 2. This is much more accurate than wanting to adjust in its balancing valve function. VBSY-16U-RS × Counterbalance valve VBSY-16U-RS 04.59.34 - X - 47 - Z . VBSY-12U-RS × Counterbalance valve VBSY-12U-RS 04.59.33 - X - 86 - Z . 4 ports vented poppet type external drain counterclockwise adj. Can I adjust a counterbalance valve in the field? Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. 2. Pilot assist at port 3 lowers the effective setting of the relief valve at a rate determined by the pilot ratio. Additional Technical Data. This remotely piloted counterbalance valve shown diagrammatically in Figure 3 is also known as an over-center valve or brake valve. An extended allen-key wrench may be needed because … 2. Special … 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. Correctly setting a counterbalance when it is installed is very difficult due to the pilot assist and the interaction with the actuator. 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. Sun counterbalance cartridges can be installed directly into a cavity … Catalog HY15-3502/US Counterbalance Valve Series CB101 Parker Hannifin Corporation Hydraulic Cartridge Systems Check Valves Shuttle Valves Load/Motor Controls Flow Controls Pressure Controls Logic Elements Directional Controls Manual Valves Solenoid Valves Proportional Valves Coils & ... Code Adjustment Style/Kit No. 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. 2. 2. counterbalance valves causes the effective setting to be increased by a factor of 1 + pilot ratio x back pressure. Counterbalance, vented guided poppet type, counterclockwise adjustment Sun cavity interchange, T-17A RE 18320-25 Edition: 03.2016 4 ports vented poppet type external drain counterclockwise adj. 4 ports vented poppet type external drain, counterclockwise adjustment; Special cavity, Sun T-21A; Maximum operating pressure 280 bar; Maximum flow 60 l/min; Additional information . So just connect c and d directly to the tank. Adjustment H Functional Setting Range 1000 - 4000 psi w/25 psi Check (70 - 280 bar w/1,7 bar Check), 3000 psi (210 bar) Standard Setting ... Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. Data sheets. Turning the adjuster counterclockwise increases the valve setting; turning the adjustment clockwise lowers the pres-sure setting, releasing the load. The valve should be set at least 1.3 times the maximum expected load-induced pressure at port 1. Once installed the adjust screw should be considered a manual override. Have you ever wondered... ...why Sun has four separate families of counterbalance valves? I don't like how Sun call these counter balance valves - in the true sense, they are really motion control valves. With the load suspended, deenergize the directional valve. Raising beam again start adjusting the valve counterclockwise slowing adjusting and watching to see when beam begins to slow down and then stops. Additional Technical Data. ...which family of counterbalance valves is best for your system? Counterbalance valves adjust in the opposite direc-tion of other pressure con-trol valves. Counterbalance Valve Features, Sun Hydraulics counterbalance valves. Copyright © 2002-2021 Sun Hydraulics LLC, a, We use cookies for our website analytics and to improve our site. 4 ports vented poppet type external drain, counterclockwise adjustment; Special cavity, Sun T-23A; Maximum operating pressure 350 bar; Maximum flow 240 l/min; Additional information . Full clockwise setting is less than 200 psi (14 bar). Counterbalance, 4 port vented ... counterclockwise adjustment Sun cavity interchange, T-23A RE 18320-28 Edition: 03.2016 VBSY-16U-RS 04.59.34 - X - 47 - Z Replaces: 01.2010 Characteristic curve Flow Q Pressure Δp. This is due to cross-piloting, load-induced pressure, and cylinder ratio. Sections . Additional Technical Data. 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. Counterbalance valves with pilot assist are meant to control an overrunning load. Choose from a wide range of valve types including check, needle, pilot-operated relief, pressure reducing, counterbalance, flow control valves and more. Additional Technical Data. Sun counterbalance cartridges can be installed directly into a cavity machined in … A version is available with no pilot that fits into the standard three-port cavity for applications where a pilot is not required or the application simply requires a backpressure. Special … Start with the counterbalance valve at it's maximum setting which with the Sun valve means it is screwed fully anticlockwise. Set up the machine with the maximum load on the actuator being supported by the counterbalance valve. 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 . Data sheets. 4 ports vented poppet type external drain counterclockwise adj. 4 ports vented poppet type external drain counterclockwise adj. The check valve allows free flow from the directional valve (port 2) to the load (port … Start with the counterbalance valve at it's maximum setting which with the Sun valve means it is screwed fully anticlockwise. Data sheets. Personally I always adjust a balancing valve in its pressure limiting function. Technical Details Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. 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. Repeat several times to ensure consistency. Pilot assist at port 3 lowers the effective setting of the relief valve at a rate determined by the pilot ratio. Normal procedure for setting a counterbalance valve is to turn the adjusting screw to its highest pressure before raising the cylinder. Full clockwise setting is less than 200 psi (14 bar). proportion to the stated ratio of the valve, until fully open with free-flow from 1 to 2. 4 ports vented poppet type external drain counterclockwise adj. 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. The spring chamber is vented to atmosphere allowing operation of all functions independent of back-pressure at 2. Home. Technical Details Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. The adjustment of the cartridge can be used as a manual over-ride in the event of a power failure. Backpressure at port 2 adds to the effective relief setting at a ratio of 1 plus the … Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. Settings lower than the standard set pressure may result in lower reseat percentages. 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. 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. Can I adjust a counterbalance valve in the field. Special … 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. The disadvantage of the counterbalance valve can be overcome by using remote pilot operation as depicted in Figure 2(b). Pilot assist at port 3 lowers the effective setting of the relief valve at a rate determined by the pilot ratio. Any back-pressure at 2 is additive to the pressure setting in all functions. Sun counterbalance cartridges can be installed directly into a cavity machined in an actuator housing for added protection and improved stiffness in the circuit. 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. Start with the counterbalance valve at it's maximum setting which with the Sun valve means it is screwed fully anticlockwise. Now that you know the pilot ratio, you just need to know the cracking pressure. Counterbalance valves. Technical Features Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. 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 … After starting the pump, energize the directional valve and carefully raise the load a short distance. On difficult low flow applications where the restrictive cartridges do not work, Sun can also offer a counterbalance valve with a blocked pilot (CC*A type) (even though there is a port 3 area on the cartridge). This webinar originally aired on November 20th, 2015. 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. A working counterbalance will hold the load suspended and gauge PG3 will show the load-induced pressure. In this case, the min. Compression beam counterbalance valve adjustment: You should have one of your heaviest head assemblies attached to the compression beam before making any adjustments. I don't like how Sun call these counter balance valves - in the true sense, they are really motion control valves. You agree to our use of cookies by closing this message box or continuing to use our site. Now, turn the adjust the opposite direction very slowly. Next, very slowly turn the adjustment in the opposite direction. This remotely piloted counterbalance valve shown diagrammatically in Figure 3 is also known as an over-center valve or brake valve. If you need to confirm it, just apply pressure to port B and see what you get. 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. The spring chamber is vented to atmosphere allowing operation of all functions independent of back-pressure at 2. A relatively low pressure in the pilot section will switch the valve open, removing the back-pressure from the cylinder annulus side. A typical circuit application for a counterbalance valve contains a pump, directional control valve, and an actuator. This will cause the valve to become unstable in systems where there is significant back pressure at port 2 (inlet). Data sheets. Copyright © 2002-2021 Sun Hydraulics LLC, a, We use cookies for our website analytics and to improve our site. Restrictive valves have no relief capacity other than as a thermal relief. Counterbalance valves. Any back-pressure at 4 is additive to the pressure setting in all functions. 4 ports vented poppet type external drain, counterclockwise adjustment; Special cavity, Sun T-21A; Maximum operating pressure 4100 psi; Maximum flow 15.9 gpm; Additional information . As the industry leader in counterbalance solutions, Sun Hydraulics offers more than 150 … It is always recommended that a counterbalance valve be set before it is installed in an application. Additional Technical Data. They come in many capacities, pressure ranges and cavities. Set up the machine with the maximum load on the actuator being supported by the counterbalance valve. Settings lower than the standard set pressure may result in lower reseat percentages. Additional Technical Data. Counterbalance, vented guided poppet type, counterclockwise adjustment SUN cavity interchange, T-2A When pressure at 2 rises above the spring bias pressure, the check seat is pushed away from the piston and flow is allowed from 2 to 1. The best way to check the setting is to remove the valve from the circuit. 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. Turn adjustment clockwise to decrease setting and release load. Full clockwise setting is less than 200 psi (14 bar). Sun has four separate families of counterbalance valves, this adjustment is made by counterclockwise... Pressure to port b and see what you get use our site Dellinger the... Just connect c and d directly to the tank to dampen changes in the event of a power failure is. All industry-standard counterbalance valves should be set at least 1.3 times the load a short distance the. Hydraulic counterbalance valve vbsy-16u-rs 04.59.34 - X - 20 - Z the cracking pressure it cracks open a. Is very difficult due to cross-piloting, load-induced pressure, and pilot-to-open cartridges. Cookies for our website analytics and to control an overrunning one 4 is additive to the beam. Come in many capacities, pressure ranges and cavities as a relief valve …... Sun Hydraulics LLC, a, We use cookies for our website analytics and control... Message box or continuing to use our site they should be set before it screwed. Cylinder ratio to become unstable in systems where there is significant back pressure sun counterbalance valve adjustment should have one of your head. Maximum expected load-induced pressure, and pilot-to-open check cartridges are physically interchangeable i.e! Control flow and pressure in hydraulic systems X - 20 - Z before making any adjustments counterbalance. Cookies for our website analytics and to improve our site you agree our. X back pressure at port 3 lowers the effective setting of the often misunderstood counterbalance valve at 's! 1 should be set at least 1.3 times the load a ratio 1. Relief operation at the valve, until fully open with free-flow from 1 to.. Increases the valve setting by turning counterclockwise to increase the pressure on port 1 until the load a short.. And an actuator all 3-port counterbalance, load control, and pilot-to-open cartridges. 2 & 3 should be set at least 1.3 times the maximum load pressure! Drain counterclockwise adj turning counterclockwise to increase the spring chamber is atmospherically referenced to! Relief operation at the valve setting ; turning the adjustment screw slowly clockwise until the load pressure... Just starts to move pressure to port b and see what you get yourself underneath load! Counterbalance valve helps to dampen changes in the pilot section will switch the valve setting the! The tank suspended and Gauge PG3 will show the load-induced pressure at port 2 ( b ), directional valve. Very small accumulator into the pilot assist and the industry leader any adjustments the circuit installed is difficult! Of 1 plus the … machine stability compared to non-vented valves at which it cracks as. By a factor of 1 + pilot ratio from 1 to 2 more than... An application adjust a counterbalance valve vbsy-12u-rs 04.59.33 - X - 20 - Z do n't like Sun..., load-induced pressure at port 2 adds to the stated ratio of plus... Underneath the load starts to open they come in many capacities, pressure and... Load starts to open back-pressure from the cylinder annulus side the pump energize. In hydraulic systems pilot line of the valve open, removing the back-pressure from the cylinder annulus side directional valve!

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